LIQUID PHASE HEAT TRANSFER IN CIRCULAR MICROCHANNELS AT LOW TEMPERATURES

摘要：

This paper presents heat transfer results from measurement of single phase methane at approx. -130 ℃ and approx. 10 bar in a circular tube with inner diameter of 1 mm. Measurement are in the range of 100 ＜ G ＜ 1050 kgm-2s-1 (G = Mass Flux) and 5 ＜ q ＜ 19 kWm-2 (q = Heat Flux). The measurements are compared to conventional correlations for macrotubes.For turbulent flow, the heat transfer is as predicted by conventional correlations when taking the increased surface area due to roughness into account. For laminar flow an increased heat transfer is observed, which can be fitted to entry length models. It is suggested that enhancement effects related to the increased relative roughness can explain the increased heat transfer.

作者: K.A.Mar(a)k

作者单位: Norwegian University of Science and Technology.Kolbjφrn Hejes veg 1b, 7491 Trondheim, Norway

会议类型: 国际会议

会议名称: The 22nd International Congress of Refrigeration(第22届国际制冷大会)

会议地点: 北京

会议语种:英文

在线出版日期: 2007-08-21（万方平台首次上网日期，不代表论文的发表时间）