倾斜对窄矩形通道内流动阻力特性影响

doi:10.11949/j.issn.0438-1157.20160323

化工学报 ›› 2016, Vol. 67 ›› Issue (9): 3633-3639.DOI: 10.11949/j.issn.0438-1157.20160323

倾斜对窄矩形通道内流动阻力特性影响

田春平, 阎昌琪, 王建军, 熊昆

哈尔滨工程大学核安全与仿真技术国防重点学科实验室, 黑龙江哈尔滨 150001

收稿日期:2016-03-21 修回日期:2016-04-26 出版日期:2016-09-05 发布日期:2016-09-05
通讯作者: 王建军
基金资助:
国家自然科学基金项目（11175050）。

Effect of inclination on flow resistance characteristic in narrow rectangular channel

TIAN Chunping, YAN Changqi, WANG Jianjun, XIONG Kun

Fundamental Science on Nuclear Safety and Simulation Technology Laboratory, Harbin Engineering University, Harbin 150001, Heilongjiang, China

Received:2016-03-21 Revised:2016-04-26 Online:2016-09-05 Published:2016-09-05
Supported by:
supported by the National Natural Science Foundation of China (11175050).

摘要/Abstract

摘要：

在绝热强迫循环条件下，进行了窄矩形通道内的流动阻力特性实验研究，结果表明：在层流区，矩形通道内的摩擦阻力系数与Shah & London关系式吻合很好。在加热自然循环条件下，为探究倾斜与摩擦阻力特性的关系，进行了压力0.2 MPa，欠热度40～60 K，倾斜角度-30°～30°的单相流动阻力特性实验研究。结果表明：在倾斜条件下，基于Navier-Stocks方程的摩擦阻力预测值不再适用于单面加热窄矩形通道；在层流区，正倾会使单面加热窄矩形通道内的流动阻力增大，且阻力系数随倾斜角度增加而显著增大；反倾时，阻力系数随倾斜角度改变无明显变化；密度差驱动产生的二次流动使得低Reynolds数下的摩擦阻力系数变大。

关键词: 倾斜, 微通道, 阻力特性, 水热, 层流, 二次流, 自然循环

Abstract:

Most existing studies on flow resistance characteristic focus on horizontal or vertical narrow rectangular channel, however, the inclined heated channel can be found in many heat exchanger under ocean condition. Thus, it is necessary to do some researches on it. The experiments were conducted in a narrow rectangular channel under unheated force circulation condition and heated natural circulation condition. The inclination angles ranged from -30° to 30° with 40-60 K subcooling and pressure of 0.2 MPa. It was found that the friction factors for laminar flow under unheated condition were very close to the predictions of Shah & London correlation, whereas discrepancies occured when the channel was heated. The friction factor was found to increase with the positive inclination angles, but little response to the negative inclination was found. The secondary flow driven by density differences may be the reason for differences between friction factors.

Key words: inclination, microchannels, flow resistance, hydrothermal, laminar flow, secondary flow, natural circulation

中图分类号:

TL334

田春平, 阎昌琪, 王建军, 熊昆. 倾斜对窄矩形通道内流动阻力特性影响[J]. 化工学报, 2016, 67(9): 3633-3639.

TIAN Chunping, YAN Changqi, WANG Jianjun, XIONG Kun. Effect of inclination on flow resistance characteristic in narrow rectangular channel[J]. CIESC Journal, 2016, 67(9): 3633-3639.

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倾斜对窄矩形通道内流动阻力特性影响

Effect of inclination on flow resistance characteristic in narrow rectangular channel

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