Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7055714 | International Journal of Heat and Mass Transfer | 2016 | 10 Pages |
Abstract
An interconnected microchannel net (IMN) was developed using microfabrication technique for flow boiling heat transfer enhancement. The flow boiling experiments were conducted using deionized water as the working fluid with variation in the heat flux and mass flux (G = 100, 180 and 250 kg mâ2 sâ1) and a comparison with conventional rectangular microchannels (RMC) was investigated. The results indicated that the IMN yielded higher heat transfer coefficient and lower pressure drop at G = 100 and 180 kg mâ2 sâ1 than that of the RMC. However, a reverse trend was observed at G = 250 kg mâ2 sâ1. A transition of boiling mechanism from the nucleate boiling region to the convective boiling region occurred with increase of vapor quality for both samples at G = 180 and 250 kg mâ2 sâ1 accompanied with the flow pattern changing from the bubbly flow to annular flow, which didn't occur at G = 100 kg mâ2 sâ1. Further study revealed that the advantage of mitigating the two-phase flow instability for the IMN diminished as mass flux increased to G = 250 kg mâ2 sâ1. Such phenomenon may account for the lower heat transfer rate and higher pressure drop for the IMN than that for the RMC at high mass flux.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Fluid Flow and Transfer Processes
Authors
Shiwei Zhang, Yong Tang, Wei Yuan, Jian Zeng, Yingxi Xie,