標題: Two-phase heat transfer characteristics for R-22/R-407C in a 6.5-mm smooth tube
作者: Wang, CC
Chiang, CS
機械工程學系
Department of Mechanical Engineering
關鍵字: flow pattern;two-phase flow;R-22, R-407C;heat transfer;pressure drops
公開日期: 1-十二月-1997
摘要: Two-phase friction and heat transfer characteristics for R-22/R-407C inside a 6.5-mm smooth tube are reported in this study, The hear transfer results for G = 100 and 400 kg/m(2) s were reported in the present study, and the adiabatic frictional pressure drop was recorded in the range of 100 to 700 kg/m(2) s, It is found that the development of flow pattern for R-407C Falls behind R-22. This may explain the lower pressure drops for R-407C. The major heat transfer mechanism at low mass flux is nucleate boiling, and virtually becomes the convective evaporation as mass flux increase to G = 400 krg/m(2) s, Meanwhile, the reduction of heat transfer coefficients for R-407C mixtures are especially profound at low mass flux, and The reduction of heat transfer coefficient decreases with the increase of mass flux. (C) 1997 by Elsevier Science Inc.
URI: http://hdl.handle.net/11536/172
ISSN: 0142-727X
期刊: INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW
Volume: 18
Issue: 6
起始頁: 550
結束頁: 558
顯示於類別:期刊論文


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  1. 000071061800002.pdf