Journal of Applied Science and Engineering

Published by Tamkang University Press

1.30

Impact Factor

2.10

CiteScore

Tzong-Shyng Leu1 , Chin-Tsan Wang This email address is being protected from spambots. You need JavaScript enabled to view it.2 and Nan-Jia Huang1

1Department of Aeronautics and Astronautics, National Cheng Kung University, Tainan, Taiwan 701, R.O.C.
2Department of Mechanical and Electro-Mechanical Engineering, National I Lan University, I-Lan, Taiwan 260, R.O.C.


 

Received: February 25, 2014
Accepted: January 23, 2015
Publication Date: March 1, 2015

Download Citation: ||https://doi.org/10.6180/jase.2015.18.1.04  


ABSTRACT


A micro capillary pumped loop (MCPL) system is a highly efficient heat transfer device that uses capillary force in the evaporator region as the driving force to pump working fluid in a loop. In this study, the effects of micro-channel geometry and surface modification within an MCPL evaporator of MCPLs will be studied for improving the heat transfer performance. Techniques of surface modification are applied in this study to selectively define the surface as a hydrophilic or hydrophobic area. Results show that the higher the heating power provided by the micro heater, the faster the growing rate of the thermal bubble will be. Generally speaking, the larger the amount of injected working fluids applied, the faster the thermo bubble motion will be. When the size of the channel is scaled down, nucleation of the thermal bubble would occur easily and heat transfer enhancement would be expected. It is also found that bubbles generated by heater h2 (initial location of diffuser) will have a self-driven force to move the bubbles downward because of using a hydrophilic diffuser area. These findings will be useful to the further the optimal design of MCPLs in the future.


Keywords: Micro Capillary Pumped Loop (MCPL), Thermo Bubble, Micro-Channel, Heat Transfer, Surface Modification


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