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Bibliografie tematiche / Microchannel absorber

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Letteratura scientifica selezionata sul tema "Microchannel absorber"

Autore: Grafiati

Pubblicato: 21 dicembre 2024

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Articoli di riviste sul tema "Microchannel absorber"

1

Goel, Nitin, and D. Yogi Goswami. "Experimental Verification of a New Heat and Mass Transfer Enhancement Concept in a Microchannel Falling Film Absorber." Journal of Heat Transfer 129, no. 2 (2006): 154–61. http://dx.doi.org/10.1115/1.2402182.

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This paper presents an experimental study of a new concept of using a screen mesh to enhance heat and mass transfer in a microchannel falling film absorber. Results of the experiments on the conventional and mesh-enhanced microchannel absorber designs are then reported. The experimental study shows that the absorber heat load for the mesh-enhanced design is about 17%±3.4%-26%±3.8% higher than a conventional microchannel design. The paper also presents a comparison of the experimental results with a numerical model. A finite difference scheme is used to model the heat and mass transfer processe

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2

Alston, Mark E. "Optimal Microchannel Planar Reactor as a Switchable Infrared Absorber." MRS Advances 2, no. 14 (2017): 783–89. http://dx.doi.org/10.1557/adv.2017.112.

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ABSTRACTThis paper will propose methods to use leaf vasculature formations to advance a material to act as an infrared block. The research shows the use of microfluidics based flows to direct the structural assembly of a polymer into a thermally functional material. To manage IR radiation stop-band to lower a polymer device phase transition temperature. This paper will determine this functionality by hierarchical multi microchannel network scaling, to regulate laminar flow rate by analysis as a resistor circuit.Nature uses vasculature formations to modulate irradiance absorption by laminar flu

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3

Sui, Zengguang, Wei Wu, Tian You, Zhanying Zheng, and Michael Leung. "Performance investigation and enhancement of membrane-contactor microchannel absorber towards compact absorption cooling." International Journal of Heat and Mass Transfer 169 (April 2021): 120978. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2021.120978.

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4

Kim, Yoon Jo, Yogendra K. Joshi, and Andrei G. Fedorov. "Performance analysis of air-cooled microchannel absorber in absorptionbased miniature electronics cooling system." Journal of Mechanical Science and Technology 22, no. 2 (2008): 338–49. http://dx.doi.org/10.1007/s12206-007-1034-5.

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5

García-Hernando, N., M. Venegas, and M. de Vega. "Experimental performance comparison of three flat sheet membranes operating in an adiabatic microchannel absorber." Applied Thermal Engineering 152 (April 2019): 835–43. http://dx.doi.org/10.1016/j.applthermaleng.2019.02.129.

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6

Sui, Zengguang, Chong Zhai, and Wei Wu. "Swirling flow for performance improvement of a microchannel membrane-based absorber with discrete inclined grooves." International Journal of Refrigeration 130 (October 2021): 382–91. http://dx.doi.org/10.1016/j.ijrefrig.2021.05.039.

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7

Sui, Zengguang, Chong Zhai, and Wei Wu. "Parametric and comparative study on enhanced microchannel membrane-based absorber structures for compact absorption refrigeration." Renewable Energy 187 (March 2022): 109–22. http://dx.doi.org/10.1016/j.renene.2022.01.052.

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8

Motamedi, Mahdi, Chia-Yang Chung, Mehdi Rafeie, et al. "Experimental Testing of Hydrophobic Microchannels, with and without Nanofluids, for Solar PV/T Collectors." Energies 12, no. 15 (2019): 3036. http://dx.doi.org/10.3390/en12153036.

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Solar energy can be converted into useful energy via photovoltaic cells or with a photothermal absorber. While these technologies are well-developed and commercially viable, significant benefits can be realised by pulling these two technologies together in photovoltaic/thermal (PV/T) systems which can provide both heat and electricity from a single collector. Emerging configurations in the PV/T field aim to incorporate micro and/or nanotechnology to boost total solar utilisation even further. One example of this is the nanofluid-based PV/T collector. This type of solar collector utilises nanof

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9

Sui, Zengguang, Yunren Sui, and Wei Wu. "Multi-objective optimization of a microchannel membrane-based absorber with inclined grooves based on CFD and machine learning." Energy 240 (February 2022): 122809. http://dx.doi.org/10.1016/j.energy.2021.122809.

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10

Wei, Xinghua, Rijing Zhao, Siyuan Wu, Shouzhen Wang, and Dong Huang. "Effect of rhombus mesh on 3D falling film flow characteristics over microchannel flat tube for LiBr (Lithium bromide) absorber." International Journal of Heat and Mass Transfer 209 (August 2023): 124097. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2023.124097.

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Tesi sul tema "Microchannel absorber"

1

Cheng, Hao. "Etude d'absorption chimique du dioxyde de carbone : transfert de masse en écoulement diphasique dans un minicanal et conception d'un nouvel absorbeur multicanaux." Electronic Thesis or Diss., Nantes Université, 2024. http://www.theses.fr/2024NANU4030.

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Les dispositifs à micro/mini-canaux suscitent un vif intérêt pour l'absorption chimique efficace du CO₂ dans le cadre du captage de CO2. Cette thèse de doctorat vise à caractériser et à étudier le processus de transfert de masse à travers l’écoulement diphasique accompagné de réactions chimiques dans les mini-canaux, ainsi qu'à concevoir et développer de nouveaux absorbeurs de CO₂ miniaturisés avec des structures optimisées vis-à-vis de leurs performances d'absorption. Tout d'abord, la dynamique des bulles dans un mini-canal droit en T a été observée par moyen optique, montrant que la réaction

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2

Ammari, Ali. "Experimental Investigation of two-phase flow in microchannels. Co-current Absorption of Ammonia in Water to Design an Innovative Bubble Plate Absorber." Thesis, KTH, Skolan för kemivetenskap (CHE), 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-156190.

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Abstract (sommario):

For ammonia-water absorption refrigeration technology it is suggested to use bubble type absorbers because the higher contact surface area provides a higher mass transfer rate. Furthermore, dispersion of bubbles in the bulk of liquid phase also exhibits better heat transfer characteristics that facilitate the recovery of dissipated heat of the exothermic absorption. In this context, plate heat exchangers are believed to be an option to be employed as absorber in some applications. Commercial plate heat exchangers have only one inlet and outlet for a working fluid and as a result, gas and liqui

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3

Ammari, Ali. "Experimental Investigation ofTwo-phase Flow in Microchannels“Co-current Absorption of Ammonia in Water to Design an Innovative Bubble Plate Absorber” : “Co-current Absorption of Ammonia in Water to Design an Innovative Bubble Plate Absorber”." Thesis, KTH, Tillämpad termodynamik och kylteknik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-116779.

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Abstract (sommario):

For ammonia-water absorption refrigeration technology it is suggested to use bubble type absorbers because the higher contact surface area provides a higher mass transfer rate. Furthermore, dispersion of bubbles in the bulk of liquid phase also exhibits better heat transfer characteristics that facilitate the recovery of dissipated heat of the exothermic absorption.In this context, plate heat exchangers are believed to be an option to be employed as absorber in some applications. Commercial plate heat exchangers have only one inlet and outlet for a working fluid and as a result, gas and liquid

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Atti di convegni sul tema "Microchannel absorber"

1

Nagavarapu, Ananda Krishna, and Srinivas Garimella. "Falling-Film Absorption Around Microchannel Tube Banks." In ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-63094.

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An experimental investigation of heat and mass transfer in a falling-film absorber with microchannel tube arrays was conducted. Liquid ammonia-water solution flows in a falling-film mode around an array of small diameter coolant tubes, while vapor flows upward through the tube array counter-current to the falling film. This absorber was installed in a test facility consisting of all components of a functional single-effect absorption chiller, including a desorber, rectifier, condenser, evaporator, solution heat exchanger, and refrigerant pre-cooler, to obtain realistic operating conditions at

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2

Liu, Yunshan, and Ebrahim Al Hajri. "Mass and Heat Transfer Characteristics of a Single-High Aspect Ratio Microchannel Absorber." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-89787.

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Recently, study on a microscale-based absorption refrigeration system has sprung up motivated by the need of efficient energy utilization. Heat-driven absorption systems offer a possibility of generating both power and cooling with environment friendly refrigerants, such as ammonia/water and LiBr/water. However, these systems are often large in size and low in COP especially in single stage absorption systems. These characteristics of absorptions systems make them unattractive in most cases. This work introduces the utilization of micro-channel enhanced surfaces as heat exchangers to enhance t

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3

de Vega, Mercedes, Néstor García-Hernando, and María Venegas. "Experimental measurement of mass transfer resistances in a membrane based adiabatic microchannel absorber." In The 4th World Congress on Momentum, Heat and Mass Transfer. Avestia Publishing, 2019. http://dx.doi.org/10.11159/icmfht19.104.

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4

Jenks, Jeromy, and Vinod Narayanan. "Effect of Channel Geometry Variations on the Performance of a Microscale Bubble Absorber." In ASME/JSME 2007 Thermal Engineering Heat Transfer Summer Conference collocated with the ASME 2007 InterPACK Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/ht2007-32445.

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The effect of microchannel geometry variations on heat transfer and absorption rate of an ammonia-water constrained thin film bubble absorber are presented. Experiments are performed at an absolute pressure of four bar and at a fixed inlet mass concentration of ammonia of 15 percent. The mass flow rate of the inlet weak solution are varied from 10 g/min to 30 g/min, and that of ammonia gas are varied from 1 g/min to 3 g/min. Five geometries, including two smooth-bottom-walled channels of differing depths, and three channels with structured bottom walls are considered. For identical rates of va

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5

Jenks, Jeromy, and Vinod Narayanan. "An Experimental Study of Ammonia-Water Bubble Absorption in a Large Aspect Ratio Microchannel." In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-14036.

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An experimental study of absorption of ammonia into a constrained thin film of ammonia-water solution is presented. A large aspect ratio microchannel with one of its walls formed by a porous material is used to constrain the thickness of the liquid film. An exit visualization section was used to confirm absorption of ammonia gas within the microchannel. Experiments were performed at a pressure of 1 bar and a fixed inlet temperature of the weak solution, for weak solution flow rates from 10 to 30 g/min, inlet mass concentrations from 0 to 15 percent, and gas flow rates between 1 and 3 g/min. Re

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6

Chugh, Devesh, Rasool Nasr Isfahani, Kyle Gluesenkamp, Omar Abdelaziz, and Saeed Moghaddam. "A Hybrid Absorption Cycle for Water Heating, Dehumidification, and Evaporative Cooling." In ASME 2015 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems collocated with the ASME 2015 13th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/ipack2015-48816.

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In this study, development of a novel system for combined water heating, dehumidification, and space cooling is discussed. The system absorbs water vapor from an air stream into an absorbent. The latent heat of absorption, released into the absorbent, is transferred into the process water that cools the absorbent. The solution is regenerated in the desorber, where it is heated by a heating fluid. The water vapor generated in the desorber is condensed and its heat of phase change is also transferred to the process water. The condensed water is then used in an evaporative cooling process to cool

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7

Cardenas, Ruander, and Vinod Narayanan. "A Numerical Study of Ammonia-Water Absorption Into a Constrained Microscale Film." In ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-67021.

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A one-dimensional, steady state, semi-empirical model of an ammonia-water microscale bubble absorber is presented. The geometry consists of a microchannel through which a solution of ammonia-water flows. Ammonia vapor is injected through one of the walls of the channel. A counter flowing coolant solution removes the heat generated due to absorption from the opposite wall. The 1-D, steady state species and energy transport equations are solved to yield, along the length of the channel, concentration and temperature profiles of the solution stream and the temperature profile of the coolant fluid

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8

Kim, Yoon Jo, Yogendra K. Joshi, and Andrei G. Fedorov. "Design of an Absorption Based Miniature Heat Pump System for Cooling of High Power Microprocessors." In ASME 2007 InterPACK Conference collocated with the ASME/JSME 2007 Thermal Engineering Heat Transfer Summer Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/ipack2007-33245.

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An absorption based miniature heat pump system, which can be driven by the low quality waste heat, is designed for chip cooling applications. Miniaturization is achieved, as the chemically-driven absorption/desorption process permits pressurization of the working fluid in liquid phase, requiring much smaller displacement volume than in vapor compression systems. The goal of this work is to design a system that keeps the chip junction temperature near room temperature, while removing 100 W of heat load. Water/LiBr pair is used as a working fluid. A dual micro-channel array evaporator is used to

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9

Nasr Isfahani, Rasool, and Saeed Moghaddam. "Absorption Characteristics of Thin Lithium Bromide (LiBr) Solution Film Constrained by a Porous Hydrophobic Membrane." In ASME 2013 11th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/icnmm2013-73158.

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An experimental study on absorption characteristics of water vapor into a thin lithium-bromide (LiBr) solution flow is presented. The LiBr solution flow is constrained between a superhydrophobic vapor-permeable wall and a solid surface that removes the heat of absorption. As opposed to conventional falling film absorbers, in this configuration, the solution film thickness and velocity can be controlled independently to enhance the absorption rate. The effects of water vapor pressure and cooling surface temperature on the absorption rate are studied. An absorption rate of approximately 0.005 kg

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10

Kelkar, Kanchan M., Suhas V. Patankar, and Sukhvinder Kang. "Computational Method for Characterization of a Microchannel Heat Sink Involving Two-Phase Flow." In ASME 2005 Pacific Rim Technical Conference and Exhibition on Integration and Packaging of MEMS, NEMS, and Electronic Systems collocated with the ASME 2005 Heat Transfer Summer Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/ipack2005-73119.

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Microchannel heat sinks are being increasingly considered for the cooling of electronic equipment because of their ability to absorb high heat fluxes directly from the heat-dissipating components in a compact manner with a low thermal resistance. In this study, a computational method is presented for the analysis of conjugate heat transfer and two-phase flow in a heat sink containing a single microchannel. It involves a two-domain solution of the three-dimensional conduction within the solid region and the one-dimensional two-phase momentum and energy transfer within a microchannel. The nonlin

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