两种烧结通道的沸腾传热和阻力特性对比

doi:10.16085/j.issn.1000-6613.2021-1794

化工进展 ›› 2022, Vol. 41 ›› Issue (7): 3483-3492.DOI: 10.16085/j.issn.1000-6613.2021-1794

两种烧结通道的沸腾传热和阻力特性对比

毛纪金¹(), 张东辉¹(), 孙利利¹, 雷钦晖¹, 屈健²

^1.江苏科技大学能源与动力学院，江苏镇江 212003
^2.江苏大学能源与动力工程学院，江苏镇江 212003

收稿日期:2021-08-20 修回日期:2021-12-22 出版日期:2022-07-25 发布日期:2022-07-23
通讯作者: 张东辉
作者简介:毛纪金（1996—），男，硕士研究生，研究方向为多孔微通道相变换热。E-mail：554436558@qq.com。

Boiling heat transfer and resistance characteristics of two types of sintered structures

MAO Jijin¹(), ZHANG Donghui¹(), SUN Lili¹, LEI Qinhui¹, QU Jian²

^1.School of Energy and Power, Jiangsu University of Science and Technology, Zhenjiang 212003, Jiangsu, China
^2.School of Energy and Power Engineering, Jiangsu University, Zhenjiang 212003, Jiangsu, China

Received:2021-08-20 Revised:2021-12-22 Online:2022-07-25 Published:2022-07-23
Contact: ZHANG Donghui

摘要/Abstract

摘要：

多孔材料对沸腾换热的强化是能源化工领域的重要主题。本文针对两种不同的烧结结构——并联微通道和扁平通道（仅有烧结底层），以去离子水为工质，进行了过冷流动沸腾换热实验对比研究。研究发现：并联微通道的传热系数和临界热流密度远高于扁平通道，这和并联微通道优异的毛细供液性能相关。底厚粒径比对并联微通道的沸腾换热性能影响较大，过大的底厚粒径比会造成换热性能的下降。质量通量对小粒径样品的沸腾曲线和换热性能均影响较大，对大粒径（d=120μm）样品的沸腾曲线影响较小。烧结并联微通道的平均压降大于扁平通道。相同底厚下，平均压降随着微通道粒径的增大而增大。可视化观察表明：两种通道在中高热流密度流型不同，其主要相变机制均为薄液膜蒸发模式。

关键词: 微尺度, 多孔微通道, 流动沸腾, 汽液两相流, 蒸发

Abstract:

The boiling heat transfer enhancement by porous materials is an important topic in the fields of energy and chemical industry. The subcooled flow boiling experiment was carried out with the deionized water as the working fluid. Two types of sintered structures were investigated: parallel porous microchannel and flat channel (only the bottom layer sintered). It was found that parallel porous microchannels presented higher HTC (heat transfer coefficient) and CHF (critical heat flux) than flat microchannels, which was attributed to the excellent capillary liquid supply performance of porous microchannels. The ratio of the bottom thickness to the particle size (δ/d) had a great effect on the boiling heat transfer performance of parallel porous microchannels. Too high δ/d would cause a deterioration in heat transfer performance. The mass flux exerted different influence on heat transfer performance over sintered samples with small or large particle size. Parallel microchannels showed greater pressure drops than flat microchannels. With the same bottom thickness, the average pressure drop increased almost linearly with sintered particle size. The visual observation showed that the flow patterns of the two channels were different at medium and high heat flux, and the main phase-change mechanism was thin film evaporation.

Key words: microscale, porous microchannel, flow boiling, vapor-liquid flow, evaporation

中图分类号:

TK124

毛纪金, 张东辉, 孙利利, 雷钦晖, 屈健. 两种烧结通道的沸腾传热和阻力特性对比[J]. 化工进展, 2022, 41(7): 3483-3492.

MAO Jijin, ZHANG Donghui, SUN Lili, LEI Qinhui, QU Jian. Boiling heat transfer and resistance characteristics of two types of sintered structures[J]. Chemical Industry and Engineering Progress, 2022, 41(7): 3483-3492.

图/表 17

图1 实验系统示意图1—恒温水箱；2—调节阀；3—微型齿轮泵；4—压力传感器；5—流量计；6—节流阀；7—板式换热器；8—储水水箱；9—微通道热沉室；10—计算机；11—高速摄影仪；12—数据采集系统

图2 热沉室示意图

图3 两种烧结结构的横向截面示意图

图4 烧结样品SEM结构图（放大1500倍）

表1 烧结样品孔隙率和底厚粒径比表

底厚δ/μm	粒径d/μm	孔隙率ε/%	厚底粒径比δ/d
200/400	30	27.70	6.7/13.3
	50	31.69	4/8
	90	41.92	2.2/4.4
	120	59.37	1.7/3.3

图5 两种烧结结构样品的毛细上升高度随时间的变化

表2 本实验相关数据的不确定度

变量	相对不确定度
加热功率Q_tot	±0.5%
热损失Q_loss	±1%
热流密度q	±1.2%
锡膏厚度δ_sn	±3%
锡膏热导率λ_sn	±1%
质量通量G	±1%
T形热电偶温度	±0.5℃
沸腾传热系数h_avg	±2.6%~10.4%

图6 热沉室热损失图

图7 200μm底厚各样品沸腾曲线

图8 400μm底厚各样品沸腾曲线

图9 200μm底厚样品传热系数变化图

图10 400μm底厚样品传热系数变化图

图11 不同流量下两样品沸腾曲线

图12 不同流量下两样品传热系数图

图13 200μm底厚样品平均压降变化图

图14 400μm底厚样品平均压降变化图

图15 两种烧结结构的可视化

参考文献 10

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两种烧结通道的沸腾传热和阻力特性对比

Boiling heat transfer and resistance characteristics of two types of sintered structures

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