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浙江大学学报(工学版)
浙江大学学报(工学版)
能源与环境工程     
单面加热微细窄通道内过冷沸腾的传热特性
冯钊赞, 李俊业, 李蔚
浙江大学 能源工程学院,浙江 杭州 310027
Heat transfer characteristics of subcooled flow boiling in one sided heating mini gap
FENG Zhao zan, LI Jun ye, LI Wei
College of Energy Engineering, Zhejiang University, Hangzhou 310027, China
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摘要：

 以去离子水为工质,对大宽高比、小长径比的单面加热微细窄通道（W=5.01 mm,H=0.52 mm）内的过冷流动沸腾进行实验研究.结合高速摄像,探讨热流密度、质量流速和通道方向对换热系数、压降和流型的影响.结果表明,竖直通道内的沸腾流型随时间变化,主要为孤立泡状流.当热流较高时,孤立汽泡的生长或互相融合可以形成拉长汽泡.在较高流速（300和400 kg/(m2·s)）下,拉长汽泡在惯性力作用下迅速离开加热段；在低流速（200 kg/(m2·s)）下,拉长汽泡向上游扩张,在整个加热段上引发短时薄液膜蒸发过程,并伴随局部干涸和重新润湿的现象,同时换热系数显著高于较高流速下.相对于竖直通道,水平通道内在较低热流下被大量汽泡占据,形成较早的干涸,压降和壁温均出现较大的波动.
Abstract:

 An experimental study of subcooled flow boiling in a one sided heating rectangular channel of high width to height ratio and small length to diameter ratio (W=5.01 mm, H=0.52 mm) was conducted using deionized water. The local heat transfer coefficient, pressure drop and flow pattern of subcooled boiling were measured. The influence of heat flux, mass flux and channel orientation was analyzed with the aid of a high speed camera. Results showed that the flow pattern of vertical upflow boiling was time dependent and governed by isolated bubbly flow. Elongated bubble can be frequently formed at higher heat fluxes either by one nucleated bubble or by bubbles combination. At relatively high mass fluxes (300, 400 kg/(m2·s)), the elongated bubble was pushed out of the heated section immediately owing to larger inertia force. At relatively low mass flux (200 kg/(m2·s)), the elongated bubble tended to expand upstream and finally covered the whole heated section, leading to thin film evaporation beneath the elongated bubble. Heat transfer coefficient was larger than that at higher mass flux due to frequently partial dryout and rewetting. Temperature and pressure drop oscillations with higher amplitude were observed for the horizontally positioned channel. The merged bubbles agglomerate in the heated section for the horizontal orientation under conditions of low heat fluxes, resulting in earlier partial dryout which deteriorates the heat transfer.
出版日期: 2016-04-01
:  TK 124  
基金资助:

高等学校博士学科点专项科研基金资助项目（20120101110102）；浙江省自然科学基金资助项目(LZ13E060001).
通讯作者: 李蔚,男,教授.ORCID: 0000 0002 2295 2542.     E-mail: weili96@zju.edu.cn
作者简介: 冯钊赞(1988— ),男,博士生,从事微纳改性表面的流动沸腾换热特性研究.ORCID: 0000 0003 1285 4145. E-mail: holonolo@zju.edu.cn
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冯钊赞, 李俊业, 李蔚. 单面加热微细窄通道内过冷沸腾的传热特性[J]. 浙江大学学报(工学版), 10.3785/j.issn.1008-973X.2016.04.011.

FENG Zhao zan, LI Jun ye, LI Wei. Heat transfer characteristics of subcooled flow boiling in one sided heating mini gap. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 10.3785/j.issn.1008-973X.2016.04.011.

链接本文:

http://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2016.04.011    或    http://www.zjujournals.com/eng/CN/Y2016/V50/I4/671

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