EXPERIMENTAL STUDY ON FLOW AND HEAT TRANSFER IN A 19.6-μM MICROTUBE

被引：6
作者：
Zhigang, L. [1 ]
Ning, G. [1 ]
Chengwu, Z. [1 ]
Xiaobao, Z. [2 ]
机构：
[1] Shandong Acad Sci, Energy Res Inst, Jinan 250014, Peoples R China
[2] Nanjing Normal Univ, Coll Power Engn, Nanjing, Peoples R China
来源：
EXPERIMENTAL HEAT TRANSFER | 2009年 / 22卷 / 03期
关键词：
microtube; friction factor; Nusselt number; electrical double layer effect; effect of variation of the thermophysical properties; LIQUID FLOW; MICROCHANNELS; CONDUCTION; LAMINAR;
D O I：
10.1080/08916150902950053
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
The flow and the heat transfer characteristics in a quartz microtube with an inner diameter of 0.0196 mm are investigated experimentally. Measuring the pressure drop between the inlet and outlet of the microtube and the average temperature of the microtube wall heated by steam when the working fluid is distilled water, the corresponding friction factors and Nusselt number are obtained. The experimental results show the friction factors in the microtube exceed those of the Hagen-Poiseuille prediction due to the predominance of the effects of the electrical double layer and the entrance. Also, the experimental Nusselt number is less than the classical laminar at Reynolds number < 500 due to the effect of the variation of the thermophysical properties with the temperature.
引用
收藏
页码：178 / 197
页数：20
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