不同宽度窄缝通道过冷沸腾

doi:10.11949/j.issn.0438-1157.20160641

化工学报 ›› 2016, Vol. 67 ›› Issue (S1): 47-56.DOI: 10.11949/j.issn.0438-1157.20160641

不同宽度窄缝通道过冷沸腾

赵楠^1,2, 张旺^1,2, 杨立新^1,2

1 北京交通大学机械与电子控制工程学院热能工程研究所, 北京 100044;
2 微细尺度流动与相变传热北京市重点实验室, 北京 100044

收稿日期:2016-05-11 修回日期:2016-05-21 出版日期:2016-08-31 发布日期:2016-08-31
通讯作者: 杨立新,lxyang1@bjtu.edu.cn
基金资助:
国家自然科学基金项目（51376022）。

Subcooled boiling in narrow channels with different sizes

ZHAO Nan^1,2, ZHANG Wang^1,2, YANG Lixin^1,2

1 Institute of Thermal Engineering, School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China;
2 Beijing Key Laboratory of Flow and Heat Transfer of Phase Changing in Micro and Small Scale, Beijing 100044, China

Received:2016-05-11 Revised:2016-05-21 Online:2016-08-31 Published:2016-08-31
Supported by:
supported by the National Natural Science Foundation of China (51376022).

摘要/Abstract

摘要：

以去离子水为实验工质，在窄缝宽度δ=3、4 mm，质量流速G=143、300 kg·m^-2·s^-1，主流过冷度ΔT_sub=17、25℃，热通量q=1～20 W·cm^-2的参数范围内，对常压下竖直窄缝通道内向上流动过冷沸腾的换热规律进行了实验研究。对不同宽度窄缝通道内的同一区域过冷沸腾气泡演变过程进行了可视化实验分析，发现窄缝宽度因素对过冷流动沸腾的流动换热特性和壁面核化特性影响显著，其中包括沸腾起始点ONB，压降ΔP，传热系数h，汽化核心密度N_a，气泡脱离直径D_d，气泡脱离频率f等。

关键词: 窄缝通道, 过冷沸腾, 壁面核化, 两相流, 气泡, 模型

Abstract:

In present paper, the heat transfer characteristics of subcooled flow boiling in vertical rectangular narrow channels of different size at atmospheric pressure were investigated experimentally by using deionized water as working fluid, under the working conditions that width δ from 3 mm to 4 mm, mass flux G=143 & 300 kg·m^-2·s^-1, inlet subcooling ΔT_sub=17 &25℃, heat flux q from 1 W·cm^-2 to 20 W·cm^-2. The visualization experiments were conducted to study the characteristics of bubble nucleation on the heating wall in the same area, then obvious channel size effects were found out, including effects on onset of boiling, heat transfer coefficient, active nucleation site density, bubble departure diameter and bubble departure frequency, etc.

Key words: narrow channel, subcooled boiling, wall nucleation, two-phase flow, bubble, model

中图分类号:

TK124

赵楠, 张旺, 杨立新. 不同宽度窄缝通道过冷沸腾[J]. 化工学报, 2016, 67(S1): 47-56.

ZHAO Nan, ZHANG Wang, YANG Lixin. Subcooled boiling in narrow channels with different sizes[J]. CIESC Journal, 2016, 67(S1): 47-56.

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不同宽度窄缝通道过冷沸腾

Subcooled boiling in narrow channels with different sizes

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