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Experimental Investigation of Flow Boiling and Resistance Features in Microchannels

Author: DaiYong
Tutor: LuoXiaoPing
School: South China University of Technology
Course: Chemical Process Equipment
Keywords: Micro-channel Boiling heat transfer Flow resistance MHD
CLC: TK124
Type: Master's thesis
Year: 2011
Downloads: 99
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Abstract


In recent years, with the development of the micro-system, more and more scholars began to focus on the microscale research, microscale heat and mass transfer problems to become one of the hot spots. So far, although there are many microscale heat and mass transfer researchers made a lot of work, and published many articles, but still far from fully understanding of microscale heat transfer and mass transfer mechanism, experimental results also vary greatly, and some even opposite. With the growing number of scholars involved in research in this area, microscale flow boiling mechanism will eventually be announced. But announced before the microscale flow boiling heat transfer mechanism, which requires researchers to accumulate a large number of experimental data for theoretical research. This article is expanded in this context, to rich microscale flow boiling experiments in the field of data; Second, through their work, in order to explore the mechanism of heat transfer and flow in the microchannel. Deionized water and 0.5% of the mass fraction of the magnetic fluid as the working fluid, a width of 0.6 mm and a height 2mm aluminum rectangular microchannels experimental study of the thermal characteristics of two-phase flow resistance characteristics. This article first chapter section reviews previous research work on boiling heat transfer, a brief summary of their work and conclusions, and thus draw major research direction - flow boiling heat transfer characteristics and pressure drop of the experiment is both directions as the guiding ideology. The second chapter briefly describes the guiding ideology experiments, the structure of the test-bed, laboratory equipment, laboratory pre-preparation work and experimental methods. The third chapter is a two-phase heat inside the micro-channels. This chapter is divided into two parts, the first part is based on deionized water as the working fluid of the experimental study. By changing the heat flux density and mass flow rate is equal to the heat transfer coefficient of the relevant parameters, different mass flow rate, the heat transfer coefficient curves under different heat fluxes and dryness, to conduct a comprehensive analysis and comparison with previous results from This proposed two-phase heat transfer coefficient and heat flux in a deionized water as the working fluid mass flow rate as well as the channel aspect ratio on the empirical formula. Second portion to the magnetic fluid as the experimental working fluid experimental studies, the same draw heat transfer coefficients and heat flux density, the mass flow rate curve, and compared with the deionized water, draw magnetic fluid as the heat transfer working medium can play strengthen the role of heat transfer. Chapter simple micro-channel flow pressure drop characteristics. Magnetic fluid as the working fluid pressure drop is larger than the deionized. Part V concludes the paper, and the lack of experimental direction for future efforts.

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CLC: > Industrial Technology > Energy and Power Engineering > Thermal engineering, heat > Thermal Engineering Theory > Heat Transfer
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