International journal of refrigeration, Vol. 36 N° 2 (N° spécial). New developements in boiling and condensation - Mars 2013
| Titre : | International journal of refrigeration, Vol. 36 N° 2 (N° spécial). New developements in boiling and condensation - Mars 2013 |
| Type de document : | Bulletin |
| Paru le : | 01/09/2013 |
Dépouillements
Article : texte imprimé
Alberto Cavallini, Auteur ;
Davide Del Col, Auteur ;
Luisa Rossetto, Auteur
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The paper presents a comprehensive overview of the most recent research works on heat transfer (and pressure drop) with natural refrigerants in minichannels, aimed at proper design of heat transfer equipment. About boiling heat transfer, experim[...]
Article : texte imprimé
Cristiano Bigonha Tibiriçá, Auteur ;
Gherhardt Ribatski, Auteur
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This paper presents a synthesized review on the recent literature concerning micro-scale flow boiling. The topics covered are macro- to micro-scale transition, flow patterns, pressure drop, heat transfer coefficient, critical heat flux, superfic[...]
Article : texte imprimé
J. B. Copetti, Auteur ;
M. H. Macagnan, Auteur ;
F. Zinani, Auteur
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Boiling heat transfer of R-600a in a 2.6 mm ID tube was investigated. Experimental conditions comprised heat fluxes of 44–95 kW m−2, mass velocities of 240 and 440 kg m−2 s−1 and saturation temperature of 22 °C. The effect of heat flux on the he[...]
Article : texte imprimé
F. Vakili-Farahani, Auteur ;
B. Agostini, Auteur ;
J. R. Thome, Auteur
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The upward flow boiling experiments were carried out in a flat aluminum extruded multiport tube, which is composed of 7 parallel rectangular channels (1.1 mm × 2.1 mm) with hydraulic diameter of 1.4 mm. Two refrigerants, R245fa and R1234ze, the [...]
Article : texte imprimé
Davide Del Col, Auteur ;
Stefano Bortolin, Auteur ;
Daniele Torresin, Auteur
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Since many HFC refrigerants have relatively large values of GWP, recent development efforts have been initiated to investigate halogenated olefins as possible refrigerants, with fluorinated propene isomers, in particular, having emerged as possi[...]
Article : texte imprimé
Nae-Hyun Kim, Auteur ;
Eul-Jong Lee, Auteur ;
Ho-Won Byun, Auteur
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In this study, evaporation heat transfer coefficients and pressure drops of R-410A were obtained in flat tubes. Flat tubes were made by progressively deforming 5.0 mm I.D. round tube. The test range covered mass flux 200–400 kg m−2 s−1, heat flu[...]
Article : texte imprimé
Duan Wu, Auteur ;
Jackson Braz Marcinichen, Auteur ;
John Richard Thome, Auteur
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The energy use in data centers is on an accelerating rise due to both demand and technological limitations. Today, the most widely used cooling strategy for data centers is refrigerated air-cooling. Unfortunately, air-cooling presents phenomenal[...]
Article : texte imprimé
K. De Kerpel, Auteur ;
B. Ameel, Auteur ;
C. T'Joen, Auteur
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The void fraction measurement technique used in this work is based on measuring the capacity between two electrodes. The electrodes are curved so they closely fit to the tube wall; due to this the measured capacitance is influenced by the spatia[...]
Article : texte imprimé
Sylwia Szczukiewicz, Auteur ;
Navid Borhani, Auteur ;
John Richard Thome, Auteur
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Two-phase flow boiling of R245fa, R236fa, and R1234ze(E) in 100 × 100 μm2 parallel microchannels for cooling of future 3D-ICs has been investigated. Significant flow instabilities, back flow, and non-uniform flow distribution among the channels [...]
Article : texte imprimé
Etienne Costa-Patry, Auteur ;
John Richard Thome, Auteur
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A new flow pattern-based prediction method for heat transfer coefficients in microchannels was developed based on recent experimental results for several multi-microchannel evaporators in silicon and copper and for single-microchannel tubes in s[...]
Article : texte imprimé
Lixin Cheng, Auteur ;
Lei Liu, Auteur
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The study of refrigerant-based nanofluid boiling and two-phase flow phenomena is still in its infancy. This field of research provides many opportunities to study new frontiers but also poses great challenges. To summarize the current status of [...]
Article : texte imprimé
E. Van Rooyen, Auteur ;
J. R. Thome, Auteur
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The phase-change process of enhanced surface pool boiling is an effective mode of heat transfer requiring on-going investigation with new refrigerants. Two of the latest generation Wolverine Tube Inc. (Turbo-B5) and Wieland Werke (Gewa-B5) enhan[...]
Article : texte imprimé
Sérgio Pereira Rocha, Auteur ;
Olivier Kannengieser, Auteur ;
Elaine Maria Cardoso, Auteur
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This paper presents experimental results for the nucleate pool boiling of R134-a on plain and micro-finned tubes at pressures between 6.1 bar and 12.2 bar. Local measurements of the temperature enabled us to identify the physical mechanism respo[...]
Article : texte imprimé
Md. Anowar Hossain, Auteur ;
Yoji Onaka, Auteur ;
Hasan M. M. Afroz, Auteur
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This experimental study measured and compared the heat transfer coefficients during in-tube evaporation of R1234ze(E), R32, the nearly azeotropic HFC refrigerant blend R410A and a zeotropic mixture R1234ze(E)/R32 (55/45 mass %) inside a water he[...]
Article : texte imprimé
S. Grauso, Auteur ;
R. Mastrullo, Auteur ;
A.W. Mauro, Auteur
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This paper presents experimental results for local heat transfer coefficients, adiabatic frictional pressure gradients and two-phase flow regimes with the low-GWP refrigerant R-1234ze(E), compared to Hydro-Fluoro-Carbon refrigerant R-134a in the[...]
Article : texte imprimé
Ricardo J. da Silva Lima, Auteur ;
John R. Thome, Auteur
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In this study, flow pattern observations and pressure drop measurements in a U-bend and contiguous straight tubes are presented. The flow pattern observations were made with R134a at an inlet saturation temperature of 5 °C flowing at a mass flux[...]
Article : texte imprimé
Taye Stephen Mogaji, Auteur ;
Fabio Toshio Kanizawa, Auteur ;
Enio Pedone Bandarra Filho, Auteur
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This study presents experimental results of heat transfer coefficient and pressure drop during two-phase flow of R134a in a horizontal tube containing twisted-tape inserts. The test section is a 2 m long copper tube of 15.9 mm inner diameter. Th[...]
Article : texte imprimé
Two-phase pressure drop characteristics of refrigerant-oil mixture in circular tubes filled with metal foam were experimentally investigated. Experimental conditions cover nominal oil concentrations from 0% to 5%, metal foam structures of 5 PPI [...]
Article : texte imprimé
Augusto G. Ulson de Souza, Auteur ;
Jader R. Barbosa Jr., Auteur
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An experimental assessment of the heat transfer coefficient in spray cooling of plain and enhanced upward-facing surfaces is presented. All surfaces of the heater were thermally insulated apart from the top end, onto which pieces with different [...]
Article : texte imprimé
Brian M. Fronk, Auteur ;
Srinivas Garimella, Auteur
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The condensation of multi-component mixtures in tubes is critical to the function of many energy conversion processes. This paper reviews experimental and analytical studies of the coupled heat and mass transfer phenomena during condensation of [...]
Article : texte imprimé
Giovanni Di Nicola, Auteur ;
Mariano Pierantozzi, Auteur
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This work presents a literature survey of the available data of the experimental surface tension data for refrigerant binary systems. The experimental data were collected for the following binary systems: R32-R227ea, R32-R125, R32-R134a, R290-R3[...]
Article : texte imprimé
L. Doretti, Auteur ;
C. Zilio, Auteur ;
S. Mancin, Auteur
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Nowadays, plain and microfin tubes are largely used in refrigeration and air conditioning industries for condensation inside macroscale tubes. The mechanisms of condensation heat transfer and pressure drop are tightly linked with the prevailing [...]
Article : texte imprimé
Ebrahim Al-Hajri, Auteur ;
Amir H. Shooshtari, Auteur ;
Serguei Dessiatoun, Auteur
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An experimental study on parametric characterization of two-phase condensing flows of refrigerants R134a and R245fa in a single microchannel was carried out utilizing a microchannel with a cross-section of 0.4 mm × 2.8 mm (7:1 aspect ratio) and [...]
Article : texte imprimé
Simone Mancin, Auteur ;
Davide Del Col, Auteur ;
Luisa Rossetto, Auteur
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This paper presents recent measurements of heat transfer coefficient obtained during condensation of R32 inside a commercial brazed plate heat exchanger (BPHE). The experimental data show the effect of refrigerant mass velocity, vapor quality, t[...]
Article : texte imprimé
Giovanni A. Longo, Auteur ;
Claudio Zilio, Auteur
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This paper presents the heat transfer coefficients and the pressure drop measured during condensation of the new low Global Warming Potential (GWP) refrigerant HFO1234yf inside a brazed plate heat exchanger: the effects of saturation temperature[...]
Article : texte imprimé
Hongtao Qiao, Auteur ;
Vikrant Aute, Auteur ;
Hoseong Lee, Auteur
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A new model has been developed for the analysis of plate heat exchangers with multi-fluid, multi-stream and multi-pass configurations. The model divides the entire heat exchanger into multiple slices in the direction of fluid flow. For the chann[...]
Article : texte imprimé
Christian J.L. Hermes, Auteur
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This paper assesses the thermo-hydraulic design approach introduced in a previous publication (Hermes, 2012) for condensers and evaporators aimed at minimum entropy generation. An algebraic model which expresses the dimensionless rate of entropy[...]
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