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Effect of R141b-Based TiO_2 Nanofluids on The Thermal Performance of an Evaporator With Rectangular Micro-Channels

DIAO Yan-Hua WANG Rui LIU Yan ZHAO Yao-Hua GUO Lei WANG Shun (College of Architecture and Civil Engineering,Beijing University of Technology,Beijing 100124,China)  
In this paper,it was investigated experimentally that the effect of TiO_2/R141b nanofluids as working fluid on the thermal performance of micro-channel surface at different pressures and particle concentrations of nanofluids.The operational pressures in this study were 0.86×10~5 Pa and 1.0×10~5 Pa,and the volume concentration of nanoparticle was in the range of 0.001%、0.01%、0.1%, respectively.In operating pressure of 0.86×10~5 Pa,nanofluids with concentrations of 0.001%and 0.01%,the corresponding heat transfer coefficients are larger than that of the base fluid.For the concentration of 0.1%,when the heat flux is higher,compared with the pure fluid,the heat transfer coefficient is lower.At pressure of 1.0×10~5 Pa,,for the concentration of 0.1%,the results indicate the heat transfer deteriorated in the range of higher heat flux.Under the same operating pressure,the results also show that for the concentrations of 0.001%and 0.01%,the heat transfer enhancement effect is not obvious.Heat transfer characteristic for TiO_2 nanoparticle-coated surface with rectangular microchannels were experimentally studied.The experimental results demonstrated that nanoparticle deposed covering has an important influence on the heat transfer behavior.
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