EXPERIMENTAL STUDY ON LOCAL SUBCOOLED FLOW BOILING HEAT TRANSFER IN A VERTICAL MINI-GAP CHANNEL

Li Junye; Feng Zhaozan; Li Wei; Zhou Kan

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EXPERIMENTAL STUDY ON LOCAL SUBCOOLED FLOW BOILING HEAT TRANSFER IN A VERTICAL MINI-GAP CHANNEL

Li Junye 1,Feng Zhaozan 1,Li Wei 1 *,Zhou Kan 2 #

1.Department of Energy Engineering, Zhejiang University

2.Department of Energy Engineering, Zhejiang University

*Correspondence author

#Submitted by

Subject:

Funding: PhD Program Foundation of Ministry of Education of China （No.20120101110102), National Science Foundation of China）

Opened online:27 May 2016

Accepted by: none

Citation: Li Junye,Feng Zhaozan,Li Wei.EXPERIMENTAL STUDY ON LOCAL SUBCOOLED FLOW BOILING HEAT TRANSFER IN A VERTICAL MINI-GAP CHANNEL[OL]. [27 May 2016] http://en.paper.edu.cn/en_releasepaper/content/4691865

An experimental study of subcooled flow boiling in a high-aspect-ratio, one-sided heating rectangular mini-gap channel was conducted using deionized water. The local heat transfer coefficient, onset of nucleate boiling, and flow pattern of subcooled boiling were investigated. The influence of heat flux and mass flux were studied with the aid of a high-speed camera. The results show that the flow pattern was mainly isolated bubbly flow when the narrow microchannel was placed vertically. The bubbles generated at lower mass fluxes were larger and did not easily depart, forming elongated bubbly flow and flowing upstream. The thin film evaporation mechanism dominated the entire test section due to the elongated bubbles and transient local dryout as well as rewet. The local heat transfer coefficient near the exit of the test section was larger

Keywords:subcooled flow boiling; micro-gap channel; heat transfer

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