An experimental study of pressure drop and friction factor for laminar and transition opposing mixed convection in entrance region of rectangular duct

被引：7
|
作者：
Chong, DaoTong [1 ]
Liu, JiPing [1 ]
Yan, JunJie [1 ]
机构：
[1] Xi An Jiao Tong Univ, State Key Lab Multiphase Flow Power Engn, Xian 710049, Peoples R China
来源：
ENERGY CONVERSION AND MANAGEMENT | 2011年 / 52卷 / 05期
关键词：
Mixed convection; Opposing flow; Pressure drop; Friction factor; FLOW HEAT-TRANSFER; AIDING FLOW; TUBES; FLUX; AIR;
D O I：
10.1016/j.enconman.2010.11.023
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
The laminar and transition opposing mixed convection was experimentally investigated when the air flow was in the entrance region through a rectangular duct. The pressure drops were measured under different air flowrates, convective heat fluxes and inclination angles, with the maximum value less than 6.0 Pa. The friction factors were calculated and analyzed under different Reynolds numbers, Grashof numbers and inclination angles. The results indicated that the pressure drops increased with the mean air velocity, and the friction factors showed different characteristics when the Reynolds numbers were larger or smaller than 1500. Finally, the correlations of friction factors were fitted considering the influences of Reynolds number, Grashof number, inclination angle and length to diameter ratio, which fitted the experimental data with the deviations less than +/- 10.0%. (c) 2010 Elsevier Ltd. All rights reserved.
引用
收藏
页码：2272 / 2281
页数：10
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