波纹壁面微细通道的Ledinegg不稳定性分析

doi:10.16085/j.issn.1000-6613.2020-0908

摘要/Abstract

摘要：

为探究不同波纹壁面微细通道的Ledinegg不稳定性，利用计算机数控加工得到3种壁面的微细通道，分别是正弦波纹、三角形波纹与普通光滑微细通道。采用R141b为实验工质，在压力为40~80kPa、热通量为13.281~22.138kW/m²、入口温度为33℃条件下开展流动换热实验。结果表明：三角形波纹微细通道的压降-流量曲线负斜率区斜率最小，流动不稳定起始点（OFI）质量流量最大，最容易发生Ledinegg不稳定性，而普通光滑微细通道与之相反。另外，随着热通量增大，微细通道的压降-流量曲线负斜率区斜率减小，OFI点质量流量增大，表明增大热通量会增加系统的不稳定性；随着系统压力增大，微细通道的压降-流量曲线负斜率区更加平缓，而OFI点质量流量变化不大，表明增大系统压力有利于提高系统的稳定性。

关键词: 波纹壁面, Ledinegg不稳定性, 流动不稳定起始点, 微细通道

Abstract:

In order to explore the Ledinegg instability of the micro-channels of different corrugated wall surfaces, computer numerical control was used to process three types of micro-channels of wall surfaces, namely sine wave, triangle wave and ordinary smooth micro-channels. R141b was used as the experimental working medium to conduct the flow heat transfer experiments under the conditions of pressure of 40—80kPa, heat flux of 13.281—22.138kW/m² and inlet temperature of 33℃. The experimental results showed that the negative slope of pressure drop-flow curve in triangular ripple micro channel has the lowest slope, and the mass flux at the onset of flow instability (OFI) is the largest, and Ledinegg instability is most likely to occur, while the normal smooth micro channel is the opposite. In addition, with the increase of heat flux, the slope of the negative slope region of the pressure drop-flow curve of the micro channel decreases, and the mass flux at OFI increases, indicating that the increase of heat flux will increase the instability of the system. With the increase of system pressure, the negative slope area of pressure drop-flow curve of the micro channel became gentler, while the mass flux at OFI did not change much, indicating that increasing system pressure was beneficial to the stability of the system.

Key words: corrugated wall, Ledinegg instability, starting point of flow instability, micro-channels

中图分类号:

TK124

罗小平, 杨婉, 王梦圆, 候群. 波纹壁面微细通道的Ledinegg不稳定性分析[J]. 化工进展, 2021, 40(3): 1325-1333.

LUO Xiaoping, YANG Wan, WANG Mengyuan, HOU Qun. Analysis of Ledinegg instability of micro-channels with corrugated wall[J]. Chemical Industry and Engineering Progress, 2021, 40(3): 1325-1333.

图/表 13

图1 Ledinegg不稳定性实验流程1—磁力泵；2-1~2-2—减振管；3-1~3-4—压力表；4-1~4-4—测温仪；5-1~5-12—节流阀；6—过滤器；7—涡轮流量计；8—流量积算仪； 9—预热水箱；10-1~10-5—观测镜；11—实验段；12—压力传感器；13—热电偶；14—数据采集模块；15—工控机；16—单向针阀；17—真空表；18—注液装置；19—冷却水箱；20—储罐

图2 微细通道实验段结构1—上盖板；2—石英玻璃板；3—工质入口；4—铝制基座；5—测温孔；6—微细通道板；7—垫片；8—橡胶垫圈；9—工质出口；10—加热板

图3 三种微细通道板

表1 壁面尺寸

壁面结构	波高A_c/mm	波长D_c/mm	波峰距离顶面高度H/mm
普通光滑	—	—	2
正弦波纹	0.8	12	2
三角形波纹	0.8	12	2

图4 测温孔布置

表2 测量误差

参数	仪器名称	测量范围	仪器精度/%
压力	压力传感器	0~100kPa	0.5
温度	K型热电偶	0~200℃	0.2
流量	涡轮流量计	0~250L·h^-1	0.5

表3 计算误差

物理量	相对不确定度/%
G	0.68
q_eff	4.57
Δp	6.81

图5 Ledinegg不稳定性[8]

图6 3种微细通道的压降-流量曲线

表4 3种微细通道的曲线负斜率区斜率

热通量q_eff /kW·m^-2	斜率k/%
热通量q_eff /kW·m^-2	普通光滑	正弦波纹	三角形波纹
13.281	-2.83	-3.39	-3.50
17.708	-3.02	-3.96	-4.35
22.138	-5.70	-6.72	-6.87

图7 不同热通量时的压降-流量曲线

图8 不同系统压力下的压降-流量曲线

图9 不同热通量时OFI点质量流量

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