Relevant bibliographies by topics / Two-phase closed thermosyphon

Academic literature on the topic 'Two-phase closed thermosyphon'

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Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Two-phase closed thermosyphon"

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Wang, Xin Yu, Gong Ming Xin, Fu Zhong Tian, and Lin Cheng. "Effect of Internal Helical Microfin on Condensation Performance of Two-Phase Closed Thermosyphon." Advanced Materials Research 516-517 (May 2012): 9–14. http://dx.doi.org/10.4028/www.scientific.net/amr.516-517.9.

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This paper investigates the condensation performance of a novel type of two-phase closed thermosyphon with internal helical microfin. The length of the thermosyphon is 1500 mm, with the filling ratio of 60%. A series of experiments were conducted for the novel and conventional thermosyphons. The results show that the internal helical microfins could not only ameliorate the thermal response characteristic but also improve the condensation heat transfer coefficient by 116.87% for the higher heat input. A correlation was developed to predict the condensation heat transfer coefficient of the novel thermosyphon.
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Chehrazi, Mohammad, and Bahareh Moghadas. "Experimental study of single walled carbon nanotube/water nanofluid effect on a two-phase closed thermosyphon performance." Journal of the Serbian Chemical Society, no. 00 (2020): 70. http://dx.doi.org/10.2298/jsc200628070c.

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Thermosyphons are one of the most efficient heat exchanger apparatus that are used extensively in different industries. One of the most common uses of this device is energy recovery, which is essential due to the energy crisis. Several parameters, such as geometric dimensions, type of working fluid, type of thermosyphon's body, affect a thermosyphon efficiency. In this experiment, the effect of type and concentration of single-walled carbon nanotube nanofluid (SWCNT / Water) on heat transfer efficiency in a two-phase closed thermosyphon (TPCT) has been investigated. For this purpose, a system with a two-phase closed thermosyphon was initially constructed. Then SWCNT/water nanofluids at 0.2, 0.5 and 1 % weight concentration were used as a working fluid in the thermosyphon system. The results of current experiments showed that the addition of nanofluid with any weight concentration and the increase of input power increases the performance of the system. Also, the heat resistance of TPCT reduced when the level of SWCNT and input power increased. So, for prepared nanofluid's samples, minimum thermal resistance obtained at 1 wt.% SWCNT and 120 W. Also, the Nusselt number increased with raising the input power and decreased with increasing the concentration. In all experiments, all prepared nanofluid samples have significantly better thermal performance in comparison with pure water.
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Ponomarev, Konstantin, Anastasiya Islamova, and Feoktistov Dmitry. "Critical heat flux in a closed two-phase thermosyphon." EPJ Web of Conferences 196 (2019): 00022. http://dx.doi.org/10.1051/epjconf/201919600022.

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A closed two-phase thermosyphon experimental setup with the possibility of recording the coolant and its vapors temperatures was developed. We proved the use of the V. M. Borishansky and S. S. Kutateladze correlations for the determination of the critical heat flux in closed two-phase thermosyphons with the ratio of their internal diameter to the length of the heat supply zone in the range of 1 < dBhym / Lu < 2.
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Maksimov, V. I., and A. Е. Nurpeiis. "Mathematical modeling of heat transfer in a closed two- phase thermosyphon." Power engineering: research, equipment, technology 21, no. 3 (November 29, 2019): 3–13. http://dx.doi.org/10.30724/1998-9903-2019-21-3-3-13.

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We suggested a new approach for describing heat transfer in thermosyphons and determining the characteristic temperatures. The processes of thermogravitation convection in the coolant layer at the lower cap, phase transitions in the evaporation zone, heat transfer as a result of conduction in the lower cap are described at the problem statement. The main assumption, which was used during the problem formulation, is that the characteristic times of steam motion through the thermosyphon channel are much less than the characteristic times of thermal conductivity and free convection in the coolant layer at the lower cap of the thermosyphon. For this reason, the processes of steam motion in the thermosyphon channel, the condensate film on the upper cap and the vertical walls were not considered. The problem solution domain is a thermosyphon through which heat is removed from the energy-saturated equipment. The ranges of heat flow changes were chosen based on experimental data. The geometric parameters of thermosyphon and the fill factors were chosen the same as in the experiments (height is 161 mm, diameter is 42 mm, wall thickness is 1.5 mm, ε=4-16%) for subsequent comparison of numerical simulation results and experimental data. In the numerical analysis it was assumed that the thermophysical properties of thermosyphon and coolant caps do not depend on temperature; laminar flow regime was considered. The dimensionless equations of vortex, Poisson and energy transfer for the liquid coolant under natural convection and the equations of thermal conductivity for the lower cap wall are solved by the method of finite differences. Numerical simulation results showed the relationship between the characteristic temperatures and the heat flow supplied to the bottom cap of thermosyphon. The results of the theoretical analysis are in satisfactory agreement with the known experimental data.
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Reed, J. G., and C. L. Tien. "Modeling of the Two-Phase Closed Thermosyphon." Journal of Heat Transfer 109, no. 3 (August 1, 1987): 722–30. http://dx.doi.org/10.1115/1.3248150.

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A comprehensive model is developed to predict the steady-state and transient performance of the two-phase closed thermosyphon. One-dimensional governing equations for the liquid and vapor phases are developed using available correlations to specify the shear stress and heat transfer coefficients. Steady-state solutions agree well with thermosyphon flooding data from several sources and with film thickness data obtained in the present investigation. While no data are available with which to compare the transient analysis, the results indicate that, for most systems, the governing time scale for system transients is the film residence time, which is typically much longer than the times required for viscous and thermal diffusion through the film. The proposed model offers a versatile and comprehensive analysis tool which is relatively simple.
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Faghri, A., M. M. Chen, and M. Morgan. "Heat Transfer Characteristics in Two-Phase Closed Conventional and Concentric Annular Thermosyphons." Journal of Heat Transfer 111, no. 3 (August 1, 1989): 611–18. http://dx.doi.org/10.1115/1.3250726.

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The heat transfer in the condenser sections of conventional and annular two-phase closed thermosyphon tubes has been studied experimentally and analytically. In addition, the results of a series of experiments on the flooding phenomena of the same thermosyphons are reported. Freon 113 and acetone were used as working fluids. An improved correlation was developed to predict the performance limits of conventional thermosyphons using the present and previously existing experimental data for flooding with different working fluids. The prediction of the theoretical Nusselt number for the situations associated with measured heat transfer coefficients in the condenser section indicated that the effect of interfacial shear on the film flow is small. The increase of the experimental reflux condensation heat transfer coefficients over theoretical predictions is attributed to waves at the vapor–liquid interface.
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Bolozdynya, A. I., V. V. Dmitrenko, Yu V. Efremenko, A. V. Khromov, R. R. Shafigullin, A. V. Shakirov, V. V. Sosnovtsev, I. A. Tolstukhin, Z. M. Uteshev, and K. F. Vlasik. "The two-phase closed tubular cryogenic thermosyphon." International Journal of Heat and Mass Transfer 80 (January 2015): 159–62. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2014.09.001.

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Aghel, Babak, Masoud Rahimi, and Saeed Almasi. "Experimental study on heat transfer characteristics of a modified two-phase closed thermosyphon." Thermal Science 21, no. 6 Part A (2017): 2481–89. http://dx.doi.org/10.2298/tsci150616118a.

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This study investigated the heat transfer characteristics of modified two-phase closed thermosyphon (TPCT) using water as the working fluid. In the modified TPCT, to reduce thermal resistance, a small TPCT was inserted inside the adiabatic section. For both the plain and modified thermosyphons the performances were determined at various heat inputs from 71-960 W. The results showed that the modified TPCT had less temperature difference between the evaporator and condenser sections than the plain one. According to the experimental data, in the modified TPCT, the thermal performance increased up to 20% over that of the unmodified one.
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Harley, C., and A. Faghri. "Complete Transient Two-Dimensional Analysis of Two-Phase Closed Thermosyphons Including the Falling Condensate Film." Journal of Heat Transfer 116, no. 2 (May 1, 1994): 418–26. http://dx.doi.org/10.1115/1.2911414.

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A transient two-dimensional thermosyphon model is presented that accounts for conjugate heat transfer through the wall and the falling condensate film. The complete transient two-dimensional conservation equations are solved for the vapor flow and pipe wall, and the liquid film is modeled using a quasi-steady Nusselt-type solution. The model is verified by comparison with existing experimental data for a low-temperature thermosyphon with good agreement. A typical high-temperature thermosyphon was then simulated to examine the effects of vapor compressibility and conjugate heat transfer.
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Wu, Zhang, Li, and Xu. "Effect of the Inclination Angle on the Steady-State Heat Transfer Performance of a Thermosyphon." Applied Sciences 9, no. 16 (August 13, 2019): 3324. http://dx.doi.org/10.3390/app9163324.

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A two-phase closed thermosyphon is an efficient heat transfer element. The heat transfer process of this type of thermosyphon includes conduction and convective heat transfer accompanied by phase changes. Variations in the inclination angle of a thermosyphon affect the steady-state heat transfer performance of the device. Therefore, the inclination angle is an important factor affecting the performance of a thermosyphon. In this paper, an equation for the actual heating area variations with respect to the inclination angle is deduced, and a model for the areal thermal resistance of a thermosyphon is proposed by analyzing the main influence mechanisms of the inclination angle on the heat transfer process. The experimental results show that the areal thermal resistance, which accounts for the effect of the actual heating area, does not change with respect to the inclination angle and exhibits a linear relationship with the heat transfer rate. The thermal resistance equation is fit according to the experimental data when the inclination angle of the thermosyphon is vertically oriented (90°), and the predicted values of the thermosyphon’s thermal resistance are obtained when the thermosyphon is inclined. The deviations between the experimental data and predicted values are less than ±0.05. Therefore, the theoretical equation can accurately predict the thermosyphon’s thermal resistance at different inclination angles.
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Dissertations / Theses on the topic "Two-phase closed thermosyphon"

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Park, Rohjoon. "Two-phase closed thermosyphon with two-fluid mixtures." Thesis, University of Ottawa (Canada), 1992. http://hdl.handle.net/10393/7685.

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An experimental study was conducted to investigate the performance of stationary two-phase closed thermosyphons with two-fluid mixtures. Three mixtures were used as the working fluids: (1) water-ethanol, (2) water-ethyleneglycol and (3) water-glycerol. The results are presented to show the effects of ratio of two fluid component, mean operating temperature, different fluid mixtures, heat flux and inclination of the thermosyphon with respect to the direction of the gravitational force. An analytical model is presented to predict the variation of the overall heat transfer coefficients with mole fraction for the thermosyphon with binary mixtures. A good agreement between the prediction by the model and the experimental results was obtained.
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Fadhl, Bandar. "Modelling of the thermal behaviour of a two-phase closed thermosyphon." Thesis, Brunel University, 2016. http://bura.brunel.ac.uk/handle/2438/12871.

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Interest in the use of heat pipe technology for heat recovery and energy saving in a vast range of engineering applications has been on the rise in recent years. Heat pipes are playing a more important role in many industrial applications, especially in increasing energy savings in commercial applications and improving the thermal performance of heat exchangers. Computational techniques play an important role in solving complex flow problems for a large number of engineering applications due to their universality, flexibility, accuracy and efficiency. However, up to now, computational studies on heat pipes are still at an early stage due to the complexity of multiphase flow characteristics and heat and mass transfer phase changes. Therefore, the main objective of this study is to develop a CFD modelling that includes the complex physical phenomena of both the heat transfer processes of evaporation and condensation and the mass transfer process of phase change during the pool boiling and film condensation. In this thesis, two novel numerical models were developed in ANSYS FLUENT. In the first, a two-dimensional CFD model was developed to visualise the two-phase flow and the evaporation, condensation and heat transfer phenomena during the operation of a wickless heat pipe, that otherwise could not be visualised by empirical or experimental work. An in-house code was developed using user-defined functions (UDFs) to enhance the ability of FLUENT to simulate the phase change occurring inside the heat pipe. Three different fluids, water, R134a and R404a, were selected as the working fluids of the investigated wickless heat pipe. The cooling system of the condenser section was simulated separately as a three-dimensional CFD model of a parallel-flow double pipe heat exchanger to model the heat transfer across the condenser section's heat exchanger and predict the heat transfer coefficients. The overall effective thermal resistance along with the temperature profile along the wickless heat pipe have been investigated. An experimental apparatus was built to carry out a thermal performance investigation on a typical wickless heat pipe for the purpose of validating the CFD simulation. A theoretical model based on empirical correlations was developed to predict the heat transfer thermal resistances in the evaporator and the condenser section. The second model was developed to combine the two-dimensional CFD simulation of the wickless heat pipe and the three-dimensional CFD simulation of the condenser section's heat exchanger to simulate the two-phase flow phenomena of boiling and condensation and the cooling system of the condenser section through a comprehensive three-dimensional CFD model of a wickless heat pipe. Two fluids, water and R134a, were selected as the working fluids of the investigated wickless heat pipe. This model was validated using a transparent glass wickless heat pipe to visualise the phenomena of pool boiling and comparing the results with the three-dimensional CFD flow visualisation. This study demonstrated that the proposed CFD models of a wickless heat pipe can successfully reproduce the complex physical phenomena of both the heat transfer process of evaporation and condensation and the mass transfer process of phase change during the pool boiling that takes place in the evaporator section and the filmwise condensation that takes place in the condenser section. The CFD simulation was successful in modelling and visualising the multiphase flow characteristics for water, R134a and R404a, emphasising the difference in pool boiling behaviour between these working fluids. The CFD simulation results were compared with experimental measurements, with good agreement obtained between predicted temperature profiles and experimental temperature data.
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Kafeel, Khurram. "Modelling and simulation of two-phase closed thermosyphones using two-fluid method." Thesis, University of Manchester, 2014. http://www.manchester.ac.uk/escholar/uk-ac-man-scw:239221.

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Computational Fluid Dynamics (CFD) has become one of the main instruments for the prediction of many commercial and research oriented fluid flow and heat transfer problems. While single phase flow analysis through CFD has gained grounds within the commercial industry, multiphase flow analysis is still the subject of further research and development. Heat Pipes and thermosyphones are no exception to this. However, the involvement of more than one fluid phase within these devices has made their analysis through CFD more challenging and computationally more demanding to perform. In this thesis, computational fluid dynamics is used as a modelling tool in order to predict the thermal hydraulic behaviour of multiphase environment within thermosyphones and heat pipes. Eulerian two-fluid method is used to solve the conservation equations for mass, momentum and energy, for each phase along with the inclusion of interfacial heat and mass transfer terms. Numerical predictions are obtained for the steady-state and transient operation of stationary thermosyphon, while rotating heat pipes operation is also simulated using axially and radially rotating heat pipe models. Apart from using the commercially available CFD code for the analysis of thermosyphones related simulation, numerical work is performed regarding the coupling of momentum equations based on Eulerian two-fluid modelling scheme. OPENFOAM open source code is used and modified to include the Partial Elimination Algorithm (PEA) for the coupling of interfacial exchange terms, including interfacial mass transfer term, in the momentum equations of both phases. Results obtained from above discussed studies provide good agreement with corresponding experimental and analytical observations.
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Rhi, Seok-Ho. "A cooling system using two-phase closed thermosyphon for telecommunication MCM: Experiment and simulation." Thesis, University of Ottawa (Canada), 1996. http://hdl.handle.net/10393/9855.

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The present study is concerned with a cooling system for multichip modules (MCM) in telecommunication systems. Due to the higher device operation speed and higher packaging density, the resulting heat flux is known to be 1 to 2 W/cm$\sp2$, which is one or two orders of magnitude higher than those of conventional systems, and beyond the capacity of high performance air cooling systems. A cooling system which can deal with a high heat flux of up to 4 W/cm$\sp2$ is the one that employs two-phase closed thermosyphons, (i.e., wickless heat pipes) and the present study presents the results of experimental and simulation study on a cooling system using two-phase closed thermosynphons for the cooling of MCM.
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Remella, Siva Rama Karthik. "Operation and Heuristic Design of Closed Loop Two-Phase Wicked Thermosyphons (CLTPWT) for Cooling Light Emitting Diodes (LEDs)." University of Cincinnati / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1522314073895889.

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Sittmann, Ilse. "Inside-pipe heat transfer coefficient characterisation of a one third height scale model of a natural circulation loop suitable for a reactor cavity cooling system of the Pebble Bed Modular Reactor." Thesis, Stellenbosch : University of Stellenbosch, 2011. http://hdl.handle.net/10019.1/6708.

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Thesis (MScEng (Mechanical and Mechatronic Engineering))--University of Stellenbosch, 2011.
ENGLISH ABSTRACT: The feasibility of a closed loop thermosyphon for the Reactor Cavity Cooling System of the Pebble Bed Modular Reactor has been the subject of many research projects. Difficulties identified by previous studies include the hypothetical inaccuracies of heat transfer coefficient correlations available in literature. The aim of the research presented here is to develop inside-pipe heat transfer correlations that are specific to the current design of the RCCS. In order to achieve this, a literature review is performed which identifies reactors which employ closed loop thermosyphons and natural circulation. The literature review also explains the general one-dimensional two-fluid conservation equations that form the basis for numerical modelling of natural circulation loops. The literature review lastly discusses available heat transfer coefficient correlations with the aim of identifying over which ranges and under which circumstances these correlations are considered accurate. The review includes correlations commonly used in natural circulation modelling in the nuclear industry in aims of identifying correlations applicable to the modelling of the proposed RCCS. One of the objectives of this project is to design and build a one-third-height-scale model of the RCCS. Shortcomings of previous experimental models were assessed and, as far as possible, compensated for in the design of the model. Copper piping is used, eliminating material and surface property uncertainties. Several sight glasses are incorporated in the model, allowing for the visual identification of two-phase flow regimes. An orifice plate is used allowing for bidirectional flow measurement. The orifice plate, thermocouples and pipe-in-pipe heat exchangers are calibrated in-situ to minimize experimental error and aid repeatability. Twelve experiments are performed with data logging occurring every ten seconds. The results presented here are limited to selected single and two-phase flow operating mode results. Error analyses and repeatability of experimental measurements for single and two-phase operating modes as well as cooling water mass flow rates are performed, to show repeatability of experimental results. These results are used to mathematically determine the experimental inside-pipe heat transfer coefficients for both the evaporator and condenser sections. Trends in the heat transfer coefficient profiles are identified and the general behaviour of the profiles is thoroughly explained. The RCCS is modelled as a one-dimensional system. Correlations for the friction factor, heat transfer coefficient, void fraction and two-phase frictional multiplier are identified. The theoretical heat transfer coefficients are calculated using the mathematical model and correlations identified in the literature review. Fluid parameters are evaluated using experimentally determined temperatures and mass flow rates. The resulting heat transfer coefficient profiles are compared to experimentally determined profiles, to confirm the hypothesis that existing correlations do not accurately predict the inside-pipe heat transfer coefficients. The experimentally determined coefficients are correlated to 99% confidence intervals. These generated correlations, along with identified and established twophase heat transfer coefficient correlations, are used in a mathematical model to generate theoretical coefficient profiles. These are compared to the experimentally determined coefficients to show prediction accuracy.
AFRIKAANSE OPSOMMING: Die haalbaarheid van ‘n natuurlike sirkulasie geslote lus vir die Reaktor Holte Verkoeling Stelsel (RHVS) van die Korrelbed Modulêre Kern-Reaktor (KMKR) is die onderwerp van talle navorsings projekte. Probleme geïdentifiseer in vorige studies sluit in die hipotetiese onakkuraatheid van hitte-oordrag koëffisiënt korrelasies beskikbaar in literatuur. Die doel van die navorsing aangebied is om binne-pyp hitte-oordrag koëffisiënt korrelasies te ontwikkel spesifiek vir die huidige ontwerp van die RHVS. Ten einde dit te bereik, word ‘n literatuurstudie uitgevoer wat kern-reaktors identifiseer wat gebruik maak van natuurlike sirkulasie lusse. Die literatuurstudie verduidelik ook die algemene een-dimensionele twee-vloeistof behoud vergelykings wat die basis vorm vir numeriese modellering van natuurlike sirkulasie lusse. Die literatuurstudie bespreek laastens beskikbare hitte-oordrag koëffisiënt korrelasies met die doel om te identifiseer vir welke massavloei tempo waardes en onder watter omstandighede hierdie korrelasies as korrek beskou is. Die ontleding sluit korrelasies in wat algemeen gebruik word in die modellering van natuurlike sirkulasie in die kern industrie met die hoop om korrelasies vir gebruik in die modellering van die voorgestelde RHVS te identifiseer. Een van die doelwitte van die projek is om ‘n een-derde-hoogte-skaal model van die RHVS te ontwerp en te bou. Tekortkominge van vorige eksperimentele modelle is geidentifiseer en, so ver as moonlik, voor vergoed in die ontwerp van die model. Koper pype word gebruik wat die onsekerhede van materiaal en opperkvlak eindomme voorkom. Verkseie deursigtige polikarbonaat segmente is ingesluit wat visuele identifikasie van twee-fase vloei regimes toelaat. ‘n Opening plaat word gebruik om voorwaartse en terugwaartse vloeimeting toe te laat. Die opening plaat, termokoppels en hitte uitruilers is gekalibreer in plek om eksperimentele foute te verminder en om herhaalbaarheid te verseker. Twaalf eksperimente word uitgevoer en data word elke tien sekondes aangeteken. Die resultate wat hier aangebied word, is beperk tot geselekteerde enkel- en tweefase vloei meganismes van werking. Fout ontleding en herhaalbaarheid van eksperimentele metings, om die herhaalbaarheid van eksperimentele resultate te toon. Hierdie is gebruik om wiskundig te bepaal wat die eksperimentele binne-pyp hitte-oordrag koëffisiënte is vir beide die verdamper en kondenseerder afdelings. Tendense in die hitte-oordrag koëffisiënt profiele word geïdentifiseer en die algemene gedrag van die profiles is deeglik verduidelik. Die RHVS is gemodelleer as 'n een-dimensionele stelsel. Korrelasies vir die wrywing faktor, hitte-oordrag koëffisiënte, leegte-breuk en twee-fase wrywings vermenigvuldiger word geïdentifiseer. Die teoretiese hitte-oordrag koëffisiënte word bereken deur middle van die wiskundige model en korrelasies wat in literatuur geidentifiseer is. Vloeistof parameters is geëvalueer met eksperimenteel bepaalde temperature en massa-vloei tempos. Die gevolglike hitte-oordrag koëffisiënt profiles is vergelyk met eksperimentele profiele om die hipotese dat die bestaande korrelasies nie die binne-pyp hitte-oordrag koëffisiënte akkuraat voorspel nie, te bevestig. Die eksperimenteel bepaalde koëffisiënte is gekorreleer en die gegenereerde korrelasies, saam met geïdentifiseerde twee-fase hitte-oordrag koëffisiënt korrelasies, word gebruik in 'n wiskundige model om teoretiese koëffisiënt profiele te genereer. Dit word dan vergelyk met die eksperimenteel bepaalde hitteoordrag koëffisiënte om die akkuraatheid van voorspelling te toon. Tekortkominge in die teoretiese en eksperimentele model word geïdentifiseer en aanbevelings gemaak om hulle aan te spreek in die toekoms.
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Lin, Wei-Chung, and 林維忠. "Fabrication of the two-phase closed thermosyphon." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/82967573407814972958.

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碩士
淡江大學
機械與機電工程學系碩士班
95
In this study, a two-phase closed thermosyphon was fabricated with annular array grooved wicks by copper. The thermosyphon consisted of a 82mm long cooper tube having an inside diameter of 19.4mm and outside diameter of 25.4mm. Rectangular grooves with 0.4mm width and 2.4mm deep were cut by WEDM inside the tube to provide device wick capillary. The tube was sealed with other components by copper-silver welding. Thermal performance of the thermosyphon was evaluated experimentally in a fan-heat sink CPU test apparatus with a heating area of 31mm×31mm. the clamping pressure between the thermosyphon and the heat sink was maintained at 13.5 kgf during the test. The influence of working fluid filling ratio and heat load are studied. D.I. water was used as the working fluid and three different filling ratio,10.5%, 18.2% and 29.7% were investigated in the research. After evaluation, the thermosyphon with 18.2% fill rate showed the best performance compared to the other samples. It had a evaporator temperature at 80℃, corresponding to a thermal resistance of 0.35℃/watt at an actual input power of 140W.
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Lai, Jung-Hsiang, and 賴榮鄉. "Experimental Evaluation of a Two-Phase Closed Thermosyphon Heat Sink." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/94282220419814455708.

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碩士
大同大學
機械工程研究所
91
This article is mainly concentrated on the properties of heat transfer mechanism of the latent heat rapidly released by two-phase closed thermosyphon. This device will be applied to the conventional aluminum heat sink device so as to improve the efficiency of heat conductivity and meet the efficient heat-sinking demand of the high temperature electronic component in the future. This research mainly aims at three critical points. The first is filling charge ratio of working fluid. When the filling charge ratio is remarkably low, it will cause the drought phenomenon on the evaporated part. If the fulfillment ratio is too high, it will decrease the boiling phenomena. Seeing from the data, the filling charge ratio of 10% will assure of the best efficiency. The second is wind blowing intensity and fan location. Suitable consideration of fan location will make air pass through the long and thin fin pads with the excellent air circulation to improve the overall efficiency of heat sink. Knowing from the present results, it is found that the wind blowing direction from bottom upside will create better efficiency. Also, the value of wind intensity will affect the efficiency of heat conductivity. The third is additive nanometer material. The evaporated part is added with the nanometer materials of high heat conductivity to improve the heat absorption rate. In the present study, the effect due to the nanofluid is not pronounced.
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Jheng, Shih-Ying, and 鄭詩穎. "Experiment Analysis of Two-phase Closed Thermosyphon Ice Storage Tank." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/dy6ewf.

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碩士
中國文化大學
機械工程學系數位機電碩士班
107
The purpose of this study is to study and analyze the two-phase thermosyphon heat pipe ice storage tank. The two-phase thermosyphon heat pipe ice storage tank proposed by the research institute has three different operation modes: general mode, ice storage mode and ice melting mode. In this paper, the heat exchange characteristics of two-phase thermosyphon heat pipes in different modes are analyzed experimentally. In the research on the performance of ice storage mode, the working fluids used in the heat pipe of this study are R-134a and R-410a. The internal working fluid of the heat pipe absorbs the heat of the energy storage material to generate boiling, and the gaseous working fluid flows upward to the double set due to buoyancy. In the tube heat exchanger, after the low-temperature refrigerant generated by the vapor compression cycle exchanges heat with the working fluid in the double casing, the working fluid inside the heat pipe condenses, and the condensate acts by gravity along the heat pipe wall. During the process of flowing down to the bottom of the heat pipe, the heat of the energy storage material is absorbed into a film Evaporation, and the heat is returned to the heat storage end of the ice storage end to complete the cycle. In this paper, the ice storage tank running performance test is carried out by experimentally studying the working fluid filling amount of 42%, 50% and 58%. By changing the brine temperature provided by the constant temperature water tank, the cold storage performance of each working fluid filling amount is analyzed and discussed. Analysis of heat exchange characteristics of phase-heat siphon heat pipes.
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Liao, Hsueh-Fen, and 廖雪芬. "Theoretical analysis of two-phase closed thermosyphon ice storage tank." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/3x8pkv.

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碩士
國立臺灣大學
機械工程學研究所
107
In recent years, due to the dramatic changes in the climate, the amount of electricity used in summer air conditioners has risen sharply. If the peaks can be used for power transfer, using off-peak power for energy storage can help improve the power supply situation in Taiwan. In this study, the superior conduction characteristics of the two-phase thermosyphon heat pipe are used for energy transfer and storage, and can be operated without the supply of external electric energy. Film evaporation and film condensation of the working fluid inside the thermosiphon (Film) Condensation) The high heat transfer capacity mechanism for heat exchange can effectively improve the performance of the ice storage tank. This study proposes a new two-phase thermosyphon heat pipe ice storage tank design, analyzing the ice storage performance of different ice storage temperatures, exploring the parameters of the influence through theoretical models, and compares the heat transfer with the ice storage tank experimental test. The error rate is approximately 3.5% to 6%. Then, based on the theoretical model of the thermoresistive capacitance, the improvement strategy of the thermosyphon heat pipe ice storage tank is analyzed, and the direction of improving the ice storage performance in the future is proposed.
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Book chapters on the topic "Two-phase closed thermosyphon"

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Qingtai, Jiao, and Tao Hanzhong. "Experimental Research of Startup Process of Two-Phase Closed Thermosyphon (TPCT)." In Proceedings of ISES World Congress 2007 (Vol. I – Vol. V), 2038–42. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-75997-3_414.

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Chang, C. S., C. Tao, and R. J. Shyu. "Performance Analysis and Test of a Two-Phase Closed Thermosyphon Heat Exchanger." In Design and Operation of Heat Exchangers, 397–406. Berlin, Heidelberg: Springer Berlin Heidelberg, 1992. http://dx.doi.org/10.1007/978-3-642-84450-8_35.

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Pawar, Shrikant V., and Abhimanyu K. Chandgude. "Thermal Performance of Two Phase Closed Thermosyphon with Acetone as Working Fluid." In Techno-Societal 2020, 1005–11. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-69921-5_100.

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Ordaz-Flores, A., O. García-Valladares, and V. H. Gómez. "Evaluation of the Thermal Performance of a Solar Water Heating Thermosyphon Versus a Two-Phase Closed Thermosyphon Using Different Working Fluids." In Proceedings of ISES World Congress 2007 (Vol. I – Vol. V), 789–93. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-75997-3_149.

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Bezrodny, M. "Fundamental Questions of Closed Two-Phase Thermosyphons." In Heat Pipes and Solid Sorption Transformations, 319–56. CRC Press, 2013. http://dx.doi.org/10.1201/b14864-10.

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Conference papers on the topic "Two-phase closed thermosyphon"

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Niro, Alfonso, G. Radaelli, and P. A. Andreini. "HEAT TRANSFER CHARACTERISTICS IN A CLOSED TWO-PHASE THERMOSYPHON." In International Heat Transfer Conference 9. Connecticut: Begellhouse, 1990. http://dx.doi.org/10.1615/ihtc9.140.

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Gabri, Raphael Ponce, and Fabio Toshio Kanizawa. "Modelling and analysis of closed loop two-phase thermosyphon." In Brazilian Congress of Thermal Sciences and Engineering. ABCM, 2018. http://dx.doi.org/10.26678/abcm.encit2018.cit18-0161.

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Shokouhmand, H., and N. Sharifi. "Variable Conductance Two-Phase Closed Flat Plate Thermosyphon With Binary Mixture." In ASME 2005 Summer Heat Transfer Conference collocated with the ASME 2005 Pacific Rim Technical Conference and Exhibition on Integration and Packaging of MEMS, NEMS, and Electronic Systems. ASMEDC, 2005. http://dx.doi.org/10.1115/ht2005-72737.

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In this paper the variable conductance heat transfer in a flat plate thermosyphon has been considered. For this purpose the governing equations including mass and momentum conservation laws are solved numerically. It should be noted that liquid-film momentum advection, axial normal stress and interfacial shear stress were typically included and shown to be important to the thermosyphon performance. It is found that total system pressure and mean vapor temperature at different concentrations of mixture are nearly constant for a special range of absorbed power in evaporator. The obtained numerical results are in good agreement with available experimental data.
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Fukano, T., K. Kadoguchi, and Chang-Lin Tien. "OSCILLATION PHENOMENA AND OPERATING LIMITS OF THE CLOSED TWO-PHASE THERMOSYPHON." In International Heat Transfer Conference 8. Connecticut: Begellhouse, 1986. http://dx.doi.org/10.1615/ihtc8.4690.

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Haider, S. I., Yogendra K. Joshi, and Wataru Nakayama. "A Natural Circulation Model of the Closed Loop, Two-Phase Thermosyphon for Electronics Cooling." In ASME 2001 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/imece2001/htd-24395.

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Abstract The study presents a model for the two-phase flow and heat transfer in the closed loop, two-phase thermosyphon (CLTPT) involving co-current natural circulation. Most available models deal with two-phase thermosyphons with counter-current circulation within a closed, vertical, wickless heat pipe. The present research focuses on CLTPTs for electronics cooling that face more complex two-phase flow patterns than the vertical heat pipes, due to closed loop geometry and smaller tube size. The present model is based on mass, momentum, and energy balances in the evaporator, rising tube, condenser, and the falling tube. The homogeneous two-phase flow model is used to evaluate the friction pressure drop of the two-phase flow imposed by the available gravitational head through the loop. The saturation temperature dictates both the chip temperature and the condenser heat rejection capacity. Thermodynamic constraints are applied to model the saturation temperature, which also depends upon the local heat transfer coefficient and the two-phase flow patterns inside the condenser. The boiling characteristics of the enhanced structure are used to predict the chip temperature. The model is compared with experimental data for dielectric working fluid PF-5060 and is in general agreement with the observed trends. The degradation of condensation heat transfer coefficient due to diminished vapor convective effects, and the presence of subcooled liquid in the condenser are expected to cause higher thermal resistance at low heat fluxes. The local condensation heat transfer coefficient is a major area of uncertainty.
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Gima, Satoru, Takashi Nagata, Xing Zhang, and Motoo Fujii. "Indirect Cooling of IC Chips Using a Two Phase Closed Thermosyphon Loop." In ASME 2003 International Electronic Packaging Technical Conference and Exhibition. ASMEDC, 2003. http://dx.doi.org/10.1115/ipack2003-35148.

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This paper reports on indirect cooling of high-power IC chips of notebook computers using a two phase closed thermosyphon loop with Fluorinert (FC-72) as the working fluid. The experimental set-up consists of an evaporator and a condenser connected by flexible tubing. The evaporator corresponds to a high-power IC chip, and the condenser represents a cooling plate located behind the display of notebook computer. The evaporator and the condenser have the outer dimensions of 50mm × 50mm × 20mm and 150mm × 200mm × 20mm, respectively. The effects of the heat input Q and the charged volume of Fluorinert liquid F on the heat transfer characteristics of the cooling system were studied experimentally. Further, the experiment for the evaporator with plate fin to enhance the boiling in the evaporator was carried out. It has been confirmed that the heater surface temperature for the evaporator with plate fin reduces about 10% in comparison with those for the evaporator without fin. It is found that enhancing the boiling in the evaporator is very effective to reduce the surface temperature of heater. In the case of the evaporator with the plate fin, the temperature difference between the heater surface and ambient is kept around 60K for the highest heat input Q = 30W in the present experiments.
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Agostini, B., and M. Habert. "Measurement of the performances of a transparent closed loop two-phase thermosyphon." In HEAT TRANSFER 2010. Southampton, UK: WIT Press, 2010. http://dx.doi.org/10.2495/ht100201.

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Kadoguchi, K., T. Fukano, and Y. Emi. "OPERATING LIMIT OF A CLOSED TWO-PHASE THERMOSYPHON WITH A BINARY MIXTURE." In International Heat Transfer Conference 10. Connecticut: Begellhouse, 1994. http://dx.doi.org/10.1615/ihtc10.1270.

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Fukano, T., K. Kadoguchi, and Chang-Lin Tien. "LOCAL HEAT TRANSFER IN A REFLUX CONDENSATION INSIDE A CLOSED TWO-PHASE THERMOSYPHON." In International Heat Transfer Conference 9. Connecticut: Begellhouse, 1990. http://dx.doi.org/10.1615/ihtc9.3740.

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Shatto, D., J. Besly, and G. Peterson. "A visualization study of flooding and entrainment in a closed two-phase thermosyphon." In 31st Thermophysics Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1996. http://dx.doi.org/10.2514/6.1996-1832.

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