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Heat transfer and fluid flow in minichannels and microchannels
Heat exchangers with minichannel and microchannel flow passages are becoming increasingly popular due to their ability to remove large heat fluxes under single-phase and two-phase applications. Heat Transfer and Fluid Flow in Minichannels and Microchannels methodically covers gas, liquid, and electrokinetic flows, as well as flow boiling and condensation, in minichannel and microchannel applications. Examining biomedical applications as well,...
28 p hcmute 13/08/2020 347 1
Từ khóa: Heat transfer, Microchannels
In this century, energy saving and environmental protection are the most interesting topics in scientific technology field. One of them is heat exchangers topic. Thus, nowadays, the conventional heat exchangers have been quickly replaced by microchannels heat sinks which giving smaller size and better heat transfer behaviors. Therefore, here are much researches focus on microchannels heat sinks, especially in boiling process, as present below.
6 p hcmute 24/03/2020 305 1
Từ khóa: Heat transfer, boiling, evaporation, pure water, distilled water, microchannel.
The experiment on the fluid flow characteristics of R134a in an evaporator with horizontal microtube was performed. In this study, the air volume flow rate and the ambient temperature has changed from 19 to 47.5 l/s and 26 to 32 0C, respectively. Besides, a comparison between the micro evaporator and the macro evaporator (FNA) was also conducted. The pressure drop of the macro evaporator is lower than that obtained from the micro evaporator....
7 p hcmute 09/01/2020 308 2
Từ khóa: Microtube; micro evaporator; R134a; fluid flow; microchannel.
Experiments on Expansion and Superheat Processes of a Co 2 Cycle Using Microchannel Evaporator
Experiments on expansion and superheat processes of a transcritical CO2 air conditioning system were done. In this study, the cross-sectional area of the expansion valve reduces from 8.195 to 0.091mm2, the cooler pressure increases and the evaporator pressure decreases; the pressure difference between cooler and evaporator increases. Besides, the power input of compressor increases as decreasing the crosssectional area.It is also observed that...
25 p hcmute 01/06/2018 540 2
Từ khóa: Experiment, CO 2 refrigerant, expansion, superheat, evaporator, microchannel
An Experimental Investigation on Condensation in Horizontal Microchannels
This paper presented an experimental study on condensation in two horizontal microchannel condensers (M1 and M2) with different substrate and channel lengths. The mass flow rate of steam and pressure drop affected to oscillation of condensation profile, beginning condensation point, and performance index. Moreover, heat transfer rate of model M1 was higher than that of model M2 at the same flow rate or pressure drop of steam. The heat transfer...
9 p hcmute 01/06/2018 327 2
Từ khóa: Condensation, heat transfer, microchannel, pressure drop, temperature.
Experiments on expansion and superheat processes of a CO2 cycle using microchannel evaporator
Experiments on expansion and superheat processes of a transcritical CO2 air conditioning system were done. In this study, the cross-sectional area of the expansion valve reduces from 8.195 to 0.091 mm2, the cooler pressure increases and the evaporator pressure decreases; the pressure difference between cooler and evaporator increases
25 p hcmute 16/05/2018 404 1
Từ khóa: Experiment, CO refrigerant, expansion, superheat, evaporator, microchannel
An experimental investigation on condensation in Horizontal Microchannels
This paper presented an experimental study on condensation in two horizontal microchannel condensers (M1 and M2) with different substrate and channel lengths. The mass flow rate of steam and pressure drop affected to oscillation of condensation profile, beginning condensation point, and performance index. Moreover, heat transfer rate of model M1 was higher than that of model M2 at the same flow rate or pressure drop of steam. The heat transfer...
9 p hcmute 15/05/2018 419 2
Từ khóa: Condensation, heat transfer, microchannel, pressure drop, temperature
In this paper, the effects of mass flow rate on heat transfer behaviours for two phase flow in rectangular microchannels were investigated by numerical simulation and experiments. The optimal approach for searching the best value of mass flow rate was studied. It was indicated that the rectangular microchannel heat sink with the mass flow rate of G = 0.4 g/s is the best choice for designing (Based on the fixed parameters as mentioned above)...
7 p hcmute 05/12/2017 450 3
Từ khóa: Microchannel, Two phase, Temperature, Velocity, Numerical simulation
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