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Influence of Oil on Flow Condensation Frictional Pressure Drop of R410A inside Small Diameter Horizontal Smooth Tubes
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HUANG Xiangchao1,HU Haitao1,DING Guoliang1，ZHU Yu1,DENG Bin2,GAO Yifeng3
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(1. Institute of Refrigeration and Cryogenics Engineering, Shanghai Jiaotong University, Shanghai 200240, China; 2. Institute of Heat Transfer Technology, Golden Dragon Precise Copper Tube Inc., Shanghai 200135, China; 3. International Copper Association Ltd., Shanghai 200020, China)
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Abstract Influence of oil on flow condensation frictional pressure drop of R410A inside 5 mm and 3 mm O.D. horizontal smooth tubes was investigated experimentally. The research results show that the presence of oil always decreases the flow condensation frictional pressure drop of R410A inside smooth tubes, and the decrement can reach up to 19% at the present test conditions; the decrement increases with the increase of nominal oil concentration, and decreases with the increase of mass flux and vapor quality. A new correlation of frictional pressure drop for R410Aoil mixture flow condensation inside small diameter smooth tubes was developed based on the mixture properties, which agrees with all the experimental data within the deviation of -20% ~ +30%.
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Received: 29 December 2009
Published: 31 October 2010
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