Relevant bibliographies by topics / Cooling mechanism

Academic literature on the topic 'Cooling mechanism'

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Published: 9 March 2023
Last updated: 10 March 2023

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Journal articles on the topic "Cooling mechanism"

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Youhua Jia, Youhua Jia, Biao Zhong Biao Zhong, and Jianping Yin Jianping Yin. "Mechanism of refrigeration cycle on laser cooling of solids." Chinese Optics Letters 10, no. 3 (2012): 031401–31404. http://dx.doi.org/10.3788/col201210.031401.

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Chen, Ziyu, Kexin Hu, Yinbo Mao, Xinrong Su, and Xin Yuan. "Interaction Mechanism and Loss Analysis of Mixing between Film Cooling Jet and Passage Vortex." Entropy 24, no. 1 (December 22, 2021): 15. http://dx.doi.org/10.3390/e24010015.

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The interaction between the film-cooling jet and vortex structures in the turbine passage plays an important role in the endwall cooling design. In this study, a simplified topology of a blunt body with a half-cylinder is introduced to simulate the formation of the leading-edge horseshoe vortex, where similarity compared with that in the turbine cascade is satisfied. The shaped cooling hole is located in the passage. With this specially designed model, the interaction mechanism between the cooling jet and the passage vortex can therefore be separated from the crossflow and the pressure gradient, which also affect the cooling jet. The loss-analysis method based on the entropy generation rate is introduced, which locates where losses of the cooling capacity occur and reveals the underlying mechanism during the mixing process. Results show that the cooling performance is sensitive to the hole location. The injection/passage vortex interaction can help enhance the coolant lateral coverage, thus improving the cooling performance when the hole is located at the downwash region. The coolant is able to conserve its structure in that, during the interaction process, the kidney vortex with the positive rotating direction can survive with the negative-rotating passage vortex, and the mixture is suppressed. However, the larger-scale passage vortex eats the negative leg of the kidney vortices when the cooling hole is at the upwash region. As a result, the coolant is fully entrained into the main flow. Changes in the blowing ratio alter the overall cooling effectiveness but have a negligible effect on the interaction mechanism. The optimum blowing ratio increases when the hole is located at the downwash region.
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Zhang, Wei, Shuai Zhou, Zhuang Wu, Guangchao Li, and Zhihai Kou. "Film Cooling Mechanism of Combined Hole and Saw-tooth Slot." International Journal of Turbo & Jet-Engines 36, no. 4 (November 18, 2019): 425–33. http://dx.doi.org/10.1515/tjj-2016-0081.

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Abstract Film cooling performance of one row of cylindrical holes integrated with saw-tooth slots was numerically studied at blowing ratios of 0.5, 1.0 1.5 and 2.0 respectively. The saw-tooth slot concept combines the advantages both of easy machining for the slot and of the high film cooling effectiveness caused by the anti-vortex induced by the shaped hole. The film holes have an inclination angles of 30°, length to diameter ratio of 4 and pitch to diameter ratio of 3. The corner angles of the saw-tooth are 60°, 90°, 120°, 150° and 180° respectively. The 180° corner angle corresponds to a standard transverse slot. The emphasis of this other is on the influence of the corner angles of the saw-tooth on film cooling effectiveness. The flow field and thermal field were obtained to explain the mechanism of film cooling performance improvement by the saw-tooth slot. The results show that the numerical data agrees with the experimental values for the cylindrical holes. Relatively small corner angles generate uniform local film cooling effectiveness and high spanwise averaged film cooling effectiveness due to the coolant ejected from the hole smoothly flowing into the slot. The effect of corner angles strongly depends on blowing ratios. The increase of x/D decreases the differences of film cooling effectiveness between various corner angles. At low blowing ratios, an anti-vortex can be found with the spanwise angle of 60° and 120°. At high blowing ratios, an anti-vortex can be found with the spanwise angle of 60°.
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Yang, Haiwei, Xue Liu, Yuyang Bian, and Ge Wang. "Numerical Investigation on the Mechanism of Transpiration Cooling for Porous Struts Based on Local Thermal Non-Equilibrium Model." Energies 15, no. 6 (March 13, 2022): 2091. http://dx.doi.org/10.3390/en15062091.

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Struts as an important structure in the combustion chamber of hypersonic flight vehicles to inject fuel into main flow face a severe thermal environment. Transpiration cooling is considered as a potential method to provide a thermal protection for struts. This paper presents a numerical investigation on transpiration cooling for a strut based on Darcy–Forchheimer model and the local thermal non-equilibrium model and analyzes the mechanism of transpiration cooling. A coolant film and a velocity boundary layer are formed on the strut surface and the shock wave is pushed away from the strut, which can effectively reduce the heat load exerted on the strut. The temperature difference between coolant and solid matrix inside the porous strut is analyzed, a phenomenon is found that the fluid temperature is higher than solid temperature at the leading edge inside the porous strut. As flowing in the porous medium, the coolant absorbs heat from solid matrix, and the fluid temperature is higher than solid temperature at the stagnation point of the strut. The influence of coolant mass flow rate and various coolants on transpiration cooling is studied. As mass flow rate increases, the cooling efficiency becomes higher and the temperature difference between fluid and solid in the porous medium is smaller. The coolant with a lower density and a higher specific heat will form a thicker film on the strut surface and absorbs more heat from solid matrix, which brings a better cooling effect for strut.
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Rego, Luis G. C., and George Kirczenow. "Electrostatic mechanism for cooling semiconductor heterostructures." Applied Physics Letters 75, no. 15 (October 11, 1999): 2262–64. http://dx.doi.org/10.1063/1.124984.

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Радченко, Роман Миколайович, Богдан Сергійович Портной, Сергій Анатолійович Кантор, Веніамін Сергійович Ткаченко, and Анатолій Анатолійович Зубарєв. "ОТРИМАННЯ І ВИКОРИСТАННЯ КОНДЕНСАТУ ПРИ ОХОЛОДЖЕННІ ПОВІТРЯ НА ВХОДІ ЕНЕРГОУСТАНОВКИ ТА ПРОБЛЕМА СЕПАРАЦІЇ КРАПЕЛЬНОЇ ВОЛОГИ З АЕРОЗОЛЬНОЇ СУМІШІ В ГРАДИРНЯХ." Aerospace technic and technology, no. 5 (November 8, 2018): 23–27. http://dx.doi.org/10.32620/aktt.2018.5.04.

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The processes of heat-humidity treatment (cooling with dehumidification) of air in a two-stage air cooling system at the inlet of a gas turbine unit applying a combined type heat-energized refrigeration mechanism, which consists of an absorption lithium-bromide high-temperature refrigeration mechanism to approximately 15 °C and a refrigerant ejector low-temperature refrigeration mechanism to 10 °С and below, which transform the heat of exhaust gases from gas turbine unit to the cold with the production of condensate in air cooling system as a by-product of air cooling has been analyzed. The analysis was carried out for the climatic conditions of the south of Ukraine. The heat removal from the condensers and the absorber of the heat-energized refrigeration mechanism are carried out with open wet cooling towers. Based on the distribution of the heat load on the steps of the two-stage air cooling system and the heat coefficients of the heat-energized refrigeration mechanisms, the project load on the cooling towers was determined and their number was selected. Based on the results of modeling of the operation of the air cooling system at the inlet of the gas turbine unit, were obtained data from the current and total amount of condensate that falls in the air cooling system during the condensation of water vapor, which is always contained in moist air, as well as the amount of water needed to feed an open cooling tower. In this case, only water losses due to mechanical removal (without taking into account its evaporation in cooling towers) were considered, which poses the problem of separation of droplet moisture from the aerosol mixture. As a result of comparing the amount of water needed to feed the cooling towers, on the one hand, and the amount of condensate obtained in the process of air cooling at the inlet of the gas turbine unit, on the other hand, was demonstrated that it is possible to partially satisfy the necessary water needs for cooling towers. A scheme of two-stage air cooling system at the inlet of a gas turbine unit with absorption lithium-bromide and refrigerant ejector refrigeration mechanism and wet cooling towers is proposed, to discharge heat from heat-energized refrigeration mechanisms, to produce condensate as a by-product of air cooling, and apply it to feed cooling towers
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Mustafa, Seham MD, and Olav Thulesius. "Cooling is a potent vasodilator of deep vessels in the rat." Canadian Journal of Physiology and Pharmacology 79, no. 11 (November 1, 2001): 899–904. http://dx.doi.org/10.1139/y01-073.

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The objectives of this study were to determine the effect of cooling on smooth muscle tone of the pulmonary artery and aorta and to clarify the basic mechanism of these responses. We recorded isometric tension in smooth muscle strips of rat pulmonary artery and aorta in organ baths during stepwise cooling. Cooling responses were tested before and after the addition of various standard agents that interfere with known neurogenic (autonomic blockers, tetrodotoxin) and myogenic mechanisms (calcium channel blockers) of relaxation. We also examined the hypothesis of the presence of a cooling-released substance. Stepwise cooling (37°C to 4°C) of aortic smooth muscle induced reproducible graded relaxations that were inversely proportional to temperature. Cooling-induced relaxation was not dependent on a neural mechanism nor the release of neurotransmitters or a cooling-released substance such as NO or CO. Cooling of pulmonary arterial and aortic smooth muscle preparations induced a graded myogenic relaxation inversely proportional to the cooling temperature. The mechanism is not dependent on local nervous or known mediators but related to a direct physico-chemical effect of cooling.Key words: cooling, vasodilatation, pulmonary artery, aorta.
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Shangguan, Yanqin, and Fei Cao. "An LBM-Based Investigation on the Mixing Mechanism of Double Rows Film Cooling with the Combination of Forward and Backward Jets." Energies 15, no. 13 (July 1, 2022): 4848. http://dx.doi.org/10.3390/en15134848.

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Film cooling has been widely applied to the highly efficient thermal protection of gas turbines. By using the simplified thermal lattice Boltzmann method (STLBM), a series of large-scale simulations of film cooling are performed to dig up the mixing mechanism of double rows film cooling with the combination of forward and backward jets at the first attempt. The combination of an upstream row with forward jet and a downstream row with backward jet is considered. The Reynolds number is 4000. The blowing ratio of the upstream coolant jet is fixed as BR1=0.5. For the downstream coolant jet (BR2), five values ranging from 0.2–0.8 are considered. The inclination angles of forward jet and backward jet are 35° and 145°, respectively. The numerical results reveal that the performance of film cooling is greatly improved by backward downstream jet due to the suppression of counterrotating vortex pair (CVP). Moreover, the flow structure is changed with the blowing ratio of backward jet. An anti-CVP having the opposite rotational direction to CVP appears as the blowing ratio of backward jet is large. The special flow structure weakens the adverse effect of CVP and transports much coolant jet to the cooled wall. Correspondingly, the time-averaged film cooling effectiveness is increased and the fluctuation of film cooling effectiveness is decreased. All of these indicate that a backward downstream jet with a large blowing ratio improves film cooling performance. The results obtained in this work help to the optimization of film cooling scheme, which also benefit the promotion and application of STLBM in gas turbine engineering.
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Kilic, Mustafa. "A numerical analysis of transpiration cooling as an air cooling mechanism." Heat and Mass Transfer 54, no. 12 (May 31, 2018): 3647–62. http://dx.doi.org/10.1007/s00231-018-2391-6.

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Zuo, Jingying, Silong Zhang, Jiang Qin, Wen Bao, Cui Naigang, and Xiaoyong Liu. "Interaction mechanism between shock waves and supersonic film cooling with cracking reaction." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 234, no. 3 (December 6, 2019): 908–23. http://dx.doi.org/10.1177/0954410019892178.

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In order to understand the interaction mechanism between shock waves and supersonic film cooling with cracking reaction, supersonic film cooling using gaseous hydrocarbon fuel as coolant in terms of cracking reaction of the coolant, with and without shock waves interaction, is investigated numerically. Theoretically, cracking reaction may be accelerated by the shock wave interaction, which may enhance the mixing of the coolant and absorb heat, which will lead to contradictory effects on supersonic film cooling. However, it turns out that, with shock waves interaction, cracking reaction only absorbs more heat but barely has any effect on the mixing either locally or further downstream due to the momentum change caused by the reaction is extremely small and the energy change plays the dominate role. It is worth mentioning that oblique shock wave causes energy accumulation in the shock wave interaction region, which deteriorates supersonic film cooling. However, with the cracking reaction considered, the negative effect brings by the oblique shock wave is weakened by the cracking reaction due to the increment of chemical heat absorption caused by the energy change. It is found that the absolute temperature in the shock wave interaction and the relative temperature increment caused by the shock wave interaction to be the decisive factors of the chemical heat absorption increment, especially for high absolute temperature or relative temperature increments, and the effect of the local reactant concentration plays the dominant role. Furthermore, the extent of weakened chemical reaction on the negative effect due to the oblique shock wave depends not only on the chemical heat absorption but also on the local absolute temperature.
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Dissertations / Theses on the topic "Cooling mechanism"

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Jawor-Baczynska, Anna. "Nucleation mechanism of crystal formation during antisolvent or cooling induced crystallisation." Thesis, University of Strathclyde, 2010. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=22626.

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This project studied the nucleation mechanism of crystal formation during antisolvent or cooling crystallisation of simple amino acids: D,L-valine and glycine. These amino acids can co-precipitate with proteins to form Protein Coated Microcrystals (PCMCs) in which the crystals create a solid support and the biomacromolecules cover their surface while remaining in a native state. The understanding of the formation mechanism of small microcrystals would help to better control and manage the process which leads to ordered attachment of biomacromolecules on their surfaces. Spectrophotometry, 1H nuclear magnetic resonance (NMR), dynamic light scattering (DLS) and optical microscopy were used to probe the evolution of the system from the transparent solution to a suspension of microcrystals. The nucleation mechanism of antisolvent crystallisation was found to involve formation of a transparent nanoemulsion composied of sub-micron valine-rich liquid nanodroplets with an average size and size distribution depending on supersaturation and the mixing conditions used during sample preparation. The supersaturated solutions prepared by cooling crystallisation, without agitation produced smaller nanodroplets and resulted in formation of only a few large crystals with an extremely slow crystallisation rate compared to samples with identical composition prepared by antisolvent crystallisation. The following nucleation mechanism of amino acids crystals is proposed: dissolution of amino acid into an aqueous/2-propanol mixture at concentration close to saturation results in spontaneous formation of a thermodynamically stable system consisting of amino acid rich liquid nanodroplets dispersed in amino acid solution; above a particular amino acid composition (consistent with the crystal solubility limit) the dispersed nanodroplets become metastable and shear induced coalescence of nanodroplets can provide access to a fast crystallisation pathway (non-classical); in the absence of shear the nanodroplets are colloidally-stable and crystallisation follows a much slower pathway (classical). The spontaneous formation of solute-rich nanodroplets below the crystalline saturation limit as well as formation of metastable solute-rich nanodroplets above this limit provides a paradigm shift which can be potentially used to develop fundamental understanding of nonclassical crystallisation phenomena. It will be crucial for better design and control of crystallisation processes in pharmaceutical applications.
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Popoola, Olubunmi Tolulope. "Numerical, Analytical, and Experimental Studies of Reciprocating Mechanism Driven Heat Loops for High Heat Flux Cooling." FIU Digital Commons, 2017. https://digitalcommons.fiu.edu/etd/3505.

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The Reciprocating Mechanism Driven Heat Loop (RMDHL) is a novel heat transfer device that utilizes reciprocating flow, either single-phase or two-phase flow, to enhance the thermal management in high tech inventions. The device attains a high heat transfer rate through a reciprocating flow of the working fluid inside the heat transfer device. Although the concept of the device has been tested and validated experimentally, analytical or numerical studies have not been undertaken to understand its working mechanism and provide guidance for the device design. The objectives of this study are to understand the underlying physical mechanisms of heat transfer in internal reciprocating flow, formulate corresponding heat transfer correlations, conduct an experimental study for the heat transfer coefficient, and numerically model the single-phase and two-phase operations of the RMDHL to predict its performance under different working conditions. The two-phase flow boiling model was developed from the Rensselaer Polytechnic Institute (RPI) model, and a virtual loop written in C programming language was used to eliminate the need for fluid structure interaction (FSI) modelling. The accuracy of several turbulence formulations, including the Standard, RNG, and Realizable k-ɛ Models, Standard and SST k-ω Models, Transition k - - ω Model, and Transition SST Model, have been tested in conjunction with a CFD solver to select the most suitable turbulence modelling techniques. The numerical results obtained from the single-phase and two-phase models are compared with relevant experimental data with good agreement. Three-dimensional numerical results indicate that the RMDHL can meaningfully reduce the peak temperature of an electronic device and result in significantly more uniform temperature across the device. In addition to the numerical study, experimental studies in conjunction with analytical studies are undertaken. Experimental data and related heat transfer coefficient as well as practically useful semi-empirical correlations have been produced, all of which provide archival information for the design of heat transfer devices involving a reciprocating flow. In particular, this research will lead to the development of more powerful RMDHLs, achieve a heat flux goal of 600 W/cm2, and significantly advance the thermal management at various levels. Considering the other advantages of coolant leakage free and the absence of cavitation problems, the RMDHL could also be employed for aerospace and battery cooling applications.
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Alfasfos, Rami. "Cavern Thermal Energy Storage for District Cooling. Feasibility Study on Mixing Mechanism in Cold Thermal Energy Storage." Thesis, KTH, Kraft- och värmeteknologi, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-219932.

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TARRAMERA, GISBERT ANGEL. "OPTOMECHANICAL COLLECTIVE EFFECTS USING COLD ATOMS IN FREE SPACE: COLLECTIVE ATOMIC RECOIL LASING & OPTICAL BINDING." Doctoral thesis, Università degli Studi di Milano, 2020. http://hdl.handle.net/2434/797082.

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This theoretical doctoral thesis investigates the collective effects that emerge in cold atomic systems caused by light-scattering in free space. Two specific cases are investigated: the collective atomic recoil laser (CARL) effect in a cold gas, without optical cavity, and a novel cooperative cooling effect via optical binding (OB) with cold atoms. As a main objective, this theoretical project investigates the spatial grating structures and the backward radiation that appears in a cold atomic cloud when it is irradiated by a single far-detuned laser beam, also known as CARL effect. While this effect has traditionally been described using a ring cavity, the study is performed here in free space, in the absence of such a cavity. Both 2D and 3D clouds show a transition from single-atom isotropic scattering to collective directional scattering. The effect is shown by the derivation and numerical solution of a set of multi-particle motion equations coupled by a self-consistent optical field, which is inspected with both a scalar model and a vectorial model. New original approaches are used to address the numerical study of the dynamics of the atomic system, such as molecular dynamics (MD) algorithms. A second system emerged, from the attempt to understand the main objective, where a few atoms rearrange themselves into crystalline atomic structures, with a periodicity between particles close to the optical wavelength. The atomic system is initially confined into a 2D plane (or 1D string) using two (or four) counter-propagating laser beams. Due to the multiple scattering experienced by all the particles in the system, a dipole-dipole force arises among them, generating a non-trivial dynamical trapping potential landscape that compels the atoms, to self-organize at distances multiple of the light wavelength. When atoms are rearranged into an atomic crystal, the force acting on each particle depends on the position of the others, thus allowing to study the stability of such optically bound structures. In addition, it turns out that a non-conservative force is generated from the dipole-dipole interaction, allowing the system to be cooled by controlling the value of certain parameters. This new phenomenon arises as a direct consequence of the use of cold atoms instead of dielectric nanoparticles in an OB system. Therefore, besides the atomic external motion, internal degrees of freedom (DOF) of the atoms are considered by treating each atom as a dipole. This latter aspect is investigated using the coupled dipole equations. When multiple atoms are set in line, the cooling mechanism is collectively enhanced, generating a novel cooperative cooling effect.
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Sjölund, Peder. "Laser cooling mechanisms and Brownian motors in optical lattices." Doctoral thesis, Umeå universitet, Institutionen för fysik, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-1127.

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Denna avhandling innefattar såväl experimentella som numeriska studier av laserkylda atomer i optiska kristallgitter. Bland annat har laserkylningsprocesser studerats, där atomers rörelser i optiska kristallgitter har uppvisat andra typer av bakomliggande mekanismer än de som tidigare förutsågs genom “Sisyfoskylningsmodellen”. Sedan atomer kylda till några mikrokelvin först realiserades (sent 60-tal) så har Sisyfoskylningsmodellen varit hörnstenen för förståelsen av laserkylda och lokaliserade atomer i dissipativa optiska kristallgitter. I dissipativa optiska kristallgitter finns det en balans mellan den uppvärmande diffusionen och den kylande friktionen. Studier i denna avhandling visar att laserkylningsprocesser är mer komplexa än vad denna modell innefattar. Både experimentella och numeriska resultat visar att atomer i optiska kristallgitter har två hastighetsfördelningar där en “kallare” och en “varmare” mod av atomer omfördelas mellan moderna. Speciellt så visar det sig att varma atomer dels värms och diffunderar ut ur gittret, men samtidigt populeras den kalla moden med en tidsutveckling som inte förändrar dess temperatur nämnvärt. I detta arbete presenteras också resultat från den första realiserade tredimensionella Brownska motorn baserad på ljus-atom-växelverkan. Det unika med denna Brownska motor är att den är kontrollerbar både vad gäller dess hastighet som dess riktning. Den underliggande principen för denna Brownska motor är tämligen generell och den kan därför vara applicerbar inom andra vetenskapliga discipliner såsom nanoteknik, biologi, kemi och elektronik. Generellt så är förståelsen av Brownska motorer viktigt eftersom de återfinns i vår omgivning, från exempelvis härkomsten av muskelsammandragningar och materialtransporter i levande celler till rörelsen hos bakterier och mindre organismer. Det flesta av de experimentella resultaten presenterade i denna avhandling har varit möjliga genom utveckling och förbättringar av den experimentella uppställningen. Framförallt så har kvaliten och reproducerbarheten vid de olika mätningar som gjorts blivit avsevärt förbättrade jämfört med tidigare vilket utgör en bra grund för framtida studier av ultrakalla atomer.
In this thesis, detailed experimental studies and numerical simulations are presented of laser cooling mechanisms in dissipative optical lattices and results of the first realized three dimensional Brownian motor in optical lattices. A dissipative optical lattice is a periodic light shift potential, created in the interference patterns of laser beams. In this, atoms can be both cooled and trapped, and the most important relaxation mechanism is generally considered to be “Sisyphus cooling”. However, careful experimental and theoretical investigations indicate the presence of other cooling processes as well. This is studied by varying different parameters such as irradiance and frequency of the lattice light. The time evolution of atoms in optical lattices show strong evidence of a bimodal velocity distribution, where a population transfer between one mode containing “hot” atoms and one mode containing “cold” atoms is evident. The normal diffusion of atoms in optical lattices is characterized by isotrop random fluctuations and exhibit the nature of Brownian motion. We have realized a technique where this motion is rectified and controlled. This is done in a three dimensional double optical lattice. This Brownian motor has control properties for both its speed and its direction in three dimensions. Our three dimensional double optical lattice is created by using laser light, exploiting two transitions, in the D2 line of cesium. Two three dimensional optical lattices are spatially overlapped; each optical lattice traps atoms in one of two hyperfine ground states. The controllability comes about by inducing phase shifts in the lattice laser beams, which displace the lattices relative to each other. This type of highly controlled Brownian motor is of fundamental interest since Brownian motion is present in almost all systems and for the role they play in protein motors and the function of living cells, and for the potential applications in nanotechnology. Brownian motors of this kind also open the way to possible studies of quantum Brownian motors and quantum resonances that are predicted for atomic ratchets. Optical lattices, and especially double optical lattices, have also been suggested as a platform for quantum state manipulations due to the good isolation from environment and ambient effects. Most of the work in this thesis is a first step towards the implementation of quantum manipulation schemes in a double optical lattice.
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Sjölund, Peder. "Laser cooling mechanisms and Brownian motors in optical lattices /." Umeå : Physics Fysik, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-1127.

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Strange, Michael Edward. "The effect of surface cooling on compressible boundary-layer instability." Thesis, University of Hull, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.296279.

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Lekakh, Boris. "Mechanisms and limitations for water-cooling of high heat flux surfaces." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/10890.

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Jagannatha, Deepak. "Heat transfer and fluid flow characteristics of synthetic jets." Thesis, Curtin University, 2009. http://hdl.handle.net/20.500.11937/2437.

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This thesis presents a fundamental research investigation that examines the thermal and fluid flow behaviour of a special pulsating fluid jet mechanism called synthetic jet. It is envisaged that this novel heat transfer enhancement strategy can be developed for high-performance heat sinks in electronic cooling applications.The study considers a unique arrangement of a periodic jet induced by diaphragm motion within a cavity and mounted on a confined flow channel with a heated wall upon which the jet impingement occurs. The operation of this jet mechanism is examined as two special cases for unravelling its parametric influences. In Case (a), the jet impingement is analysed in a channel with stagnant fluid permitting clear view of the pure synthetic jet process and its controlling variables. In Case (b), jet impingement is considered with fluid flow in the channel to establish the nature of synthetic jet and cross-flow interaction.The unsteady flow of this jet mechanism is simulated as a time-dependant two-dimensional numerical model with air as the working fluid. The current model considers a solution domain in its entirety, comprising the confined flow regions of the jet impinging surface, the cavity and the orifice. With a User Defined Function (UDF), the model accounts for the bulk fluid temperature variations during jet operation, which has been grossly ignored in all published work. Overcoming previous modelling limitations, the current simulation includes flow turbulence for realistic representation of pulsed jet characteristics and cross-flow interference.Computations are performed with applicable boundary conditions to obtain the heat transfer and fluid flow characteristics of the synthetic jet along with cross-flow interaction for the diaphragm amplitude ranging from 0.5 mm to 2 mm and the diaphragm frequency varying from 250 Hz to 1000 Hz. The numerical simulation yields stable solutions and aptly predicts the sequential formation of synthetic jet and its intrinsic vortex shedding process while accurately portraying the flow within the cavity.It is identified that the diaphragm amplitude primarily determines the jet velocity while the diaphragm frequency governs the rate of vortex ejection and the fluid circulation in the vicinity of the heater. The synthetic jet thermal performance is improved with high amplitude that gives rise to stronger jet impingement and reduced bulk fluid temperature arising from high frequency leading to better fluid circulation. The fluid flow in the channel or cross flow drags the jet downstream affecting jet’s ability to reach the heated wall. The relative strengths of jet velocity and channel flow determine the combined thermal performance. The fluid compressibility is seen to have insignificant effect on the synthetic jet behaviour within the examined range of parameters. As for geometrical parameters, reduced orifice width increases jet velocity improving heat transfer rates while the optima is identified for the heater -to- orifice distance within 6 to 10 times the orifice width.Results conclusively show that in a stagnant fluid medium, the proposed synthetic jet mechanism delivers 40 percent higher heat transfer rates than an equivalent continuous jet. It also thermally outperforms pure natural convection at the heated channel wall by up to 120 times within the parametric range. Under cross-flow conditions, the synthetic jet can provide 2-fold improvement in heat transfer compared to an equivalent continuous jet. By adding this synthetic jet mechanism to a flow channel, the overall thermal performance of the hybrid system is enhanced up to about 18 times the pure forced convection heat transfer rates in a channel without this jet mechanism.The observed outstanding thermal performance of the pulsed jet-cross flow hybrid mechanism surpasses the heat removal potential of current conventional techniques for electronic component cooling. It operates with a unique ability of not causing flow pressure drop increases and not requiring additional fluid circuits, which are recognised as key advantages that set this method apart from other techniques. Thus, the proposed synthetic jet-cross flow hybrid mechanism is envisaged to be potentially regarded as an outstanding thermal enhancement strategy in the development of heat sinks for future high-capacity electronic cooling needs.
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Grant, Ian A. "Development and modelling of weld cooling time equations." Thesis, Robert Gordon University, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.290759.

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Books on the topic "Cooling mechanism"

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Garg, Vijay Kumar. Effect of coolant temperature and mass flow on film cooling of turbine blades. [Washington, D.C: National Aeronautics and Space Administration, 1997.

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Sandīpa, Datta, and Ekkad Srinath 1958-, eds. Gas turbine heat transfer and cooling technology. 2nd ed. Boca Raton, FL: Taylor & Francis, 2012.

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Toritani, Hitoshi. A local climatological study on the mechanics of nocturnal cooling in plains and basins. Ibaraki: Universityof Tsukuba Environmental Research Center, 1990.

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Toritani, Hitoshi. A local climatological study on the mechanics of nocturnal cooling in plains and basins. Ibaraki, Japan: Environmental Research Center, the University of Tsukuba, 1990.

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United States. National Aeronautics and Space Administration. Scientific and Technical Information Program., ed. Experimental study of vane heat transfer and film cooling at elevated levels of turbulence. [Washington, D.C.]: National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Program, 1996.

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United States. National Aeronautics and Space Administration. Scientific and Technical Information Program., ed. Experimental study of vane heat transfer and film cooling at elevated levels of turbulence. [Washington, D.C.]: National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Program, 1996.

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E, Gaugler R., and United States. National Aeronautics and Space Administration., eds. Effect of velocity and temperature distribution at the hole exit on film cooling of turbine blades. [Washington, D.C: National Aeronautics and Space Administration, 1997.

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United States. National Aeronautics and Space Administration, ed. The mathematical modeling of rapid solidification processing. [Washington, D.C.]: National Aeronautics and Space Administration, 1986.

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Center, Lewis Research, ed. The mathematical modeling of rapid solidification processing. [Washington, D.C.]: National Aeronautics and Space Administration, 1986.

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Abdul-Aziz, Ali. Design evaluation using finite element analysis of cooled silicon nitride plates for a turbine blade application. [Cleveland, Ohio]: National Aeronautics and Space Administration, Glenn Research Center, 2001.

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Book chapters on the topic "Cooling mechanism"

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Ahmad, Mardiana Idayu, Hasila Jarimi, and Saffa Riffat. "Theory and Mechanism of Nocturnal Cooling." In Nocturnal Cooling Technology for Building Applications, 7–14. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-5835-7_2.

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Iyengar, Akash, Dhruv Marwha, and Sumit Singh. "Automated Cooling/Heating Mechanism for Garments." In Innovations in Computer Science and Engineering, 325–32. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-3818-1_35.

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Wang, Cui, Jianliang Zhang, Haibin Zuo, and Bing Dai. "Study on Damage Mechanism of Ductile Cast Iron Cooling Stave." In 6th International Symposium on High-Temperature Metallurgical Processing, 587–94. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781119093381.ch75.

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Wang, Cui, Jianliang Zhang, Haibin Zuo, and Bing Dai. "Study on Damage Mechanism of Ductile Cast Iron Cooling Stave." In 6th International Symposium on High-Temperature Metallurgical Processing, 587–94. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-48217-0_75.

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Perez, Libardo A. "Mechanism of Calcium Phosphate Scale Formation and Inhibition in Cooling Systems." In Calcium Phosphates in Biological and Industrial Systems, 395–415. Boston, MA: Springer US, 1998. http://dx.doi.org/10.1007/978-1-4615-5517-9_17.

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Peter, Johannes M. F., and Markus J. Kloker. "Numerical Simulation of Film Cooling in Supersonic Flow." In Notes on Numerical Fluid Mechanics and Multidisciplinary Design, 79–95. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-53847-7_5.

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Abstract High-order direct numerical simulations of film cooling by tangentially blowing cool helium at supersonic speeds into a hot turbulent boundary-layer flow of steam (gaseous H2O) at a free stream Mach number of 3.3 are presented. The stagnation temperature of the hot gas is much larger than that of the coolant flow, which is injected from a vertical slot of height s in a backward-facing step. The influence of the coolant mass flow rate is investigated by varying the blowing ratio F or the injection height s at kept cooling-gas temperature and Mach number. A variation of the coolant Mach number shows no significant influence. In the canonical baseline cases all walls are treated as adiabatic, and the investigation of a strongly cooled wall up to the blowing position, resembling regenerative wall cooling present in a rocket engine, shows a strong influence on the flow field. No significant influence of the lip thickness on the cooling performance is found. Cooling correlations are examined, and a cooling-effectiveness comparison between tangential and wall-normal blowing is performed.
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Nguyen, Duc-Nam, Jeong Hyun Lee, and Wonkyu Moon. "Determination of Fabrication Parameters for Fabrication of FOTURAN® II Glass Applied in Micro-channel Cooling System." In Advances in Asian Mechanism and Machine Science, 724–30. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-91892-7_69.

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Yin, Yaobao. "Mechanism of Pneumatic Cooling and Heating through Throttle Orifice and Pneumatic Temperature Control." In High Speed Pneumatic Theory and Technology Volume I, 299–321. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-5986-6_6.

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König, Valentina, Michael Rom, and Siegfried Müller. "A Coupled Two-Domain Approach for Transpiration Cooling." In Notes on Numerical Fluid Mechanics and Multidisciplinary Design, 33–49. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-53847-7_2.

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Abstract Transpiration cooling is an innovative cooling concept where a coolant is injected through a porous ceramic matrix composite (CMC) material into a hot gas flow. This setting is modeled by a two-domain approach coupling two models for the hot gas domain and the porous medium to each other by coupling conditions imposed at the interface. For this purpose, appropriate coupling conditions, in particular accounting for local mass injection, are developed. To verify the feasibility of the two-domain approach numerical simulations in 3D are performed for two different application scenarios: a subsonic thrust chamber and a supersonic nozzle.
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Peichl, Jonas, Andreas Schwab, Markus Selzer, Hannah Böhrk, and Jens von Wolfersdorf. "Innovative Cooling for Rocket Combustion Chambers." In Notes on Numerical Fluid Mechanics and Multidisciplinary Design, 51–64. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-53847-7_3.

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Abstract Transpiration cooling in combination with permeable ceramic-matrix composite materials is an innovative cooling method for rocket engine combustion chambers, while providing high cooling efficiency as well as enhancing engine life time as demanded for future space transportation systems. In order to develop methods and tools for designing transpiration cooled systems, fundamental experimental investigations were performed. An experimental setup consisting of a serial arrangement of four porous carbon fiber reinforced carbon (C/C) samples is exposed to a hot gas flow. Perfused with cold air, the third sample is unperfused in order to assess the wake flow development over the uncooled sample as well as the rebuilding of the coolant layer. Hereby, the focus is on the temperature boundary layer, using a combined temperature/pitot probe. Additionally, the sample surface temperature distribution was measured using IR imaging. The experiments are supported by numerical simulations which are showing a good agreement with measurement data for low blowing ratios.
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Conference papers on the topic "Cooling mechanism"

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Nonaka, Hirotaka, Hirotoshi Terada, Tomonori Nakamura, Hiroyuki Matsuura, and Akihiro Nakamura. "Cooling mechanism for high performance device analysis." In 2020 IEEE International Symposium on the Physical and Failure Analysis of Integrated Circuits (IPFA). IEEE, 2020. http://dx.doi.org/10.1109/ipfa49335.2020.9260887.

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Wei Jin, Wei Jin, Shaoen Peng Shaoen Peng, Junmei Wu Junmei Wu, Jiang Lei Jiang Lei, and Wentao Ji Wentao Ji. "Conjugate Flow and Heat Transfer Mechanism between the Rib Cooling and Film Cooling." In GPPS Xi'an21. GPPS, 2022. http://dx.doi.org/10.33737/gpps21-tc-352.

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Rib cooling and film cooling are the effective cooling schemes to meet the increasing demands of rising turbine inlet temperatures in modern gas turbine engines. Most studies have been carried out to find the flow and heat transfer characteristic of rib cooling or film cooling individually. While the conjugate heat transfer between these two cooling methods is rarely studied in the literature. In order to evaluate the interplay between the rib cooling and film cooling, the conjugate flow and heat transfer mechanism in two perpendicular flat plate channels connected by a conductive solid wall with a compound film hole through it is studied numerically. Ribs are arranged in the internal cooling channel and the heat conduction in the connecting wall and ribs are considered. The blowing ratios vary from 0.75 to 1.5. SST κ-ω and large-eddy simulation (LES) turbulence model are checked to find the applicability of the turbulence models in this simulation by comparing the numerically predicted results with the experimental results from literature. The results indicate that LES is better at capturing the fine structure of the flow field and has higher accuracy. The arrangement of film hole strengthens the heat transfer capacity of the internal cooling channel. However, the arrangement of ribs reduces the overall cooling efficiency of the mainstream cooling channel.
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Cui, Pengfei, Zhiliang Lu, Yuliang Wen, Zhimin Lu, and Shaojun Yang. "The Mechanism Research of Cooling Tower Scaling Factors in HVDC Valve Cooling System." In 2015 International Conference on Industrial Technology and Management Science. Paris, France: Atlantis Press, 2015. http://dx.doi.org/10.2991/itms-15.2015.282.

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Gevorgyan, Ara. "3D IC cooling mechanism by using signaling vias." In 2013 IEEE XXXIII International Scientific Conference on Electronics and Nanotechnology (ELNANO 2013). IEEE, 2013. http://dx.doi.org/10.1109/elnano.2013.6552044.

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Li, Mingfei, Xueying Li, Jing Ren, and Hongde Jiang. "Overall Cooling Effectiveness Characteristic and Influence Mechanism on an Endwall With Film Cooling and Impingement." In ASME Turbo Expo 2015: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/gt2015-43069.

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The cooling system is required to ensure gas turbine can work at high temperature, which has exceeded the material limitation. An endwall cooling test rig was built up to conduct the endwall cooling research. A detailed work was done for analyzing characteristics of endwall heat transfer and discussing the multi-parameter influence mechanism of overall cooling effectiveness. The main flow side heat transfer coefficient, adiabatic film cooling effectiveness and overall cooling effectiveness were measured in the experiments. The effects of coolant mass flowrate ratio (MFR) were considered through the measurement. In order to analyze how each of the parameters works on overall cooling effectiveness, a one-dimensional correlation was developed. The results showed that obvious enhancement could be found in cooling effectiveness by increasing coolant MFR, and the film jet can be easily attached to the surface after the acceleration of the main flow in the nozzle channel. Comparing with film cooling effectiveness, overall cooling effectiveness distribution is more uniform, which is due to the influence of internal cooling. The verified one-dimensional analysis method showed that the improvement in film cooling would be most efficient to heighten overall cooling effectiveness. The improvement in film cooling would be more efficient when film cooling effectiveness is in high level than in low level. However, the enhancement of internal heat transfer is more efficient when internal heat transfer coefficient is low.
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Yue, Guoqiang, Ping Dong, Yuting Jiang, Jie Gao, and Qun Zheng. "Research on Film Cooling Mechanism of Vortex Reconstruction Induced by Swirling Coolant Flow." In ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/gt2017-63886.

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In this paper, a new-type coolant chamber with higher film cooling effectiveness is proposed based on the vortex reconstruction. Three different kinds of coolant chamber configuration based on the cylindrical hole are selected to develop the swirling flow structure of coolant, and the comparative investigations have been carried out to study the effect of different coolant chambers at blowing ratios ranging from 0.5 to 2.0. The results show that the coolant jet momentum is small at low blowing ratio, and the difference of the film cooling effectiveness for three kinds of coolant chamber configuration is little, but the advantage of swirling inflow coolant film cooling becomes obviously with the increase of blowing ratio. When the blowing ratio is 2.0, the jet momentum with original coolant chamber configuration is large and uniform, which leads to the lowest cooling effectiveness due to the formation of a strong kidney vortex. The first coolant chamber configuration has a low jet momentum region at upstream of the film hole, the coolant in this region interacts with high temperature mainstream and bypasses the large jet momentum coolant to attach cooling surface at downstream, the cooling effect is obvious at downstream. The second coolant chamber configuration is sprayed with the structure of unidirectional vortex, which forms a vortex pressing on other vortex, making the coolant in pressed vortex attach surface better. The coolant laterally velocity is large, producing the best coverage and the higher film cooling effectiveness. The average film cooling effectiveness of the first and second coolant chamber configuration are larger than original by about 10% and 25%, respectively (M = 1.0), or 50% and 550% (M = 1.5). From the distribution of average film cooling effectiveness of different blowing ratios, it can be concluded that the optimal blowing ratio of swirling coolant flow film cooling is in the range of 1.8 to 2.1.
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Takeishi, Kenichiro, Yutaka Oda, Yuta Egawa, and Satoshi Hada. "Film Cooling With Swirling Coolant Flow Controlled by Impingement Cooling in a Closed Cavity." In ASME 2011 Power Conference collocated with JSME ICOPE 2011. ASMEDC, 2011. http://dx.doi.org/10.1115/power2011-55390.

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A new film cooling concept has been developed by managing the swirled film coolant induced inside a hexagonal plenum by two slant impingement jets, which are inclined at α degree toward the vertical direction and installed in a staggered position on the plenum chamber wall. Film cooling tests have been conducted by using a circular film cooling hole model mounted on a low speed wind tunnel. Heat transfer coefficient distributions of inclined jet impingements in a closed cavity was measured by naphthalene sublimation method and the film cooling effectiveness on the surface of the wind tunnel was measured by pressure sensitive paint (PSP). It appeared from experimental results that the swirled film coolant flow deteriorated the film cooling effectiveness at low swirl number but improved it at high swirl number. To investigate the mechanism of the improved film cooling effectiveness by the swirled coolant, the spatial distribution of the film cooling effectiveness and flow field were measured by laser induced fluorescence (LIF) and particle image velocimetry (PIV), respectively. The coolant jet penetration into mainstream is suppressed by the strong swirling motion of the coolant. As a result the film cooling effectiveness distribution on the wall keeps higher value behind the cooling hole over a long range. Additionally, kidney vortex structure was disappeared at high swirl number.
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Yokobori, Seiichi, Toshimi Tobimatsu, Tomohisa Kurita, Makoto Akinaga, Kenji Arai, and Hirohide Oikawa. "Heat Removal Mechanism of Passive Containment Cooling System for ALWR." In International Heat Transfer Conference 12. Connecticut: Begellhouse, 2002. http://dx.doi.org/10.1615/ihtc12.4330.

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Han, Poong-Gyoo, Hyuck Joon Namkoung, Kyoung-Ho Kim, and Yoo-Cheol Woo. "A Study on the Cooling Mechanism in Liquid Rocket Engine." In 40th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2004. http://dx.doi.org/10.2514/6.2004-3672.

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XiaoQin, Wen, Meng Liang, Xu YePing, and You LinRu. "Research of the failure mechanism and lifetime prediction to cooling fans." In 2013 25th Chinese Control and Decision Conference (CCDC). IEEE, 2013. http://dx.doi.org/10.1109/ccdc.2013.6561091.

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Reports on the topic "Cooling mechanism"

1

Kim, Jeong Won, and Sungjin Kim. International Agreements and Global Initiatives for Low-Carbon Cooling. Asian Development Bank Institute, October 2022. http://dx.doi.org/10.56506/rpae4386.

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Since the mid-1980s, the international community has controlled refrigerants that may damage the ozone layer and cause climate change based on several international agreements. In particular, the Montreal Protocol contributed to not only solving the ozone layer depletion problem but also limiting global warming. Given that the global demand for cooling would triple by 2050 and this rise would increase global greenhouse gas emissions significantly, the Montreal Protocol has expanded its regulatory scope to decarbonize the cooling sector through the adoption of the Kigali Amendment. Also, increasing interest in low-carbon cooling has driven the launch of various global initiatives to complement the international agreements and accelerate low-carbon cooling in developing countries. The experience of implementing the Montreal Protocol and its amendments suggests some lessons and insights for making the Kigali Amendment work well. First, each country should develop and enforce national policies aligned with international agreements. Second, financial and technical support mechanisms should be strengthened to facilitate developing countries’ compliance with the Kigali Amendment. Third, along with the improving energy efficiency of cooling, the substances that neither harm the ozone layer nor exacerbate climate change should be used as substitutes for hydrofluorocarbons. Last, the monitoring, reporting, and verification of controlled substances need to be strengthened.
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Tiley, J., G. B. Viswanathan, S. Nag, R. Banerjee, A. R. Singh, S. Chattopadhyay, Y. Ren, and H. L. Fraser. Mechanisms of Precipitation of Different Generations of Gamma-Prime Precipitates During Continuous Cooling of a Nickel Base Superalloy (PREPRINT). Fort Belvoir, VA: Defense Technical Information Center, August 2012. http://dx.doi.org/10.21236/ada563334.

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Jones, B. G. Characterization of jet breakup mechanisms observed from simulant experiments of molten fuel penetrating coolant. Office of Scientific and Technical Information (OSTI), January 1992. http://dx.doi.org/10.2172/7295809.

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Jones, B. G. Characterization of jet breakup mechanisms observed from simulant of molten fuel penetrating coolant. Technical progress report, 1989--1990. Office of Scientific and Technical Information (OSTI), December 1990. http://dx.doi.org/10.2172/84970.

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Jones, B. G. Characterization of jet breakup mechanisms observed from simulant experiments of molten fuel penetrating coolant. Technical progress report, FY 1992. Office of Scientific and Technical Information (OSTI), August 1992. http://dx.doi.org/10.2172/10166015.

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