Session: K16-03: HEAT TRANSFER IN ELECTRONIC EQUIPMENT III

Paper Number: 130833

130833 - High Power Operation of Micro-Scale Oscillating Heat Pipe 

Abstract: 

Microscale oscillating heat pipes (OHPs) recently drew interest in applications of electronic cooling due to their compact size and passive operating mechanism. The dryout of OHP, however, is undesirable as the liquid no longer wets the evaporator and posts an operating limit on its cooling power. In this talk, we will focus on the development of microscale oscillating heat pipes (OHPs) as spreaders to effectively remove the heat out of a microscale gap. The size of the channels in micro OHPs is about 10s of microns at which the effect of capillary pressures is significantly enhanced. We demonstrated the possibility to extract over 100 W/cm² by using thin OHPs. We will show that increasing the dryout limit of silicon-based OHPs is possible by using microchannels with hydraulic diameters of 150 µm. Two distinctive oscillating modes of liquid, the weak oscillation and the bulk liquid circulation, were found respectively. The highly periodic bulk circulations occur at high heating power and can provide efficient heat dissipation. The flow speed of the liquid under bulk circulation mode can be as high as 10 m/s. The relation between heat transfer rate and oscillating frequency during bulk circulation is consistent with a physical model that considers both sensible and latent heat. 

Presenting Author: Liang Pan Purdue University

Presenting Author Biography: Professor Liang Pan earned his M.S. and Ph.D. in Mechanical Engineering from University of California at Berkeley in 2009 and 2010, and B.S. and M.E. in Mechanics and Mechanical Engineering from University of Science and Technology of China. He currently works as an Associate Professor in the School of Mechanical Engineering at Purdue University. Prior joining Purdue, he worked as a Postdoctoral Researcher in the NSF’s Nano-scale Science and Engineering Center (NSEC) for Scalable and Integrated Nanomanufacturing (SINAM). He focuses on fundamentals of micro- and nano-scale physics and engineering, with emphasis on the applications of lithography, imaging and packaging for semiconductor manufacturing; and data storage, communication and computation for information technology.

Authors:

Qian Qian Purdue Mall
Justin Weibel Purdue University
Liang Pan Purdue University