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Year 2002, Volume 9 / Issue 2

Pages: 52

Article price - $35.00

Forced Convective Boiling of a Flurocarbon Liquid in Reduced Size Channels – an Experimental Study

Hitoshi Miznuma
Toshiba Electronics, Taiwan

Masud Behnia
School of Mechanical and Manufacturing Engineering, University of New South Wales, Sydney 2052, Australia

Wataru Nakayama
Department of Mechanical & Intelligent Systems Engineering, Tokyo Institute of Technology, 2-12-1 Oh-Okayama, Meguro-ku Tokyo 152, Japan

The present paper reports the results of an experimental study of forced convection boiling heat transfer from a 2 cm × 2 cm simulated chip to a fluorocarbon coolant (FX-3250) in a parallel-plate channel. The experimental parameters were the channel height (1 and 5 mm), the surface geometry of the simulated chip (flat and microfilmed), and the coolant velocity (0.125−4 m/s). Longitudinal microfins (0.5 mm high x 0.5 mm wide) on the finned chip increased the actual surface area to about twice that of the flat surface.
Attention was focused on the data of the 1-mm high channel. When compared with the flat chip data on the footprint area basis, the microfins produced 40% of heat transfer enhancement at coolant velocities less than 1 m/s; however, the enhancement diminishes at higher velocities. The boiling curves of the finned chip, based on the actual area, seem to reflect that there is an effect due to the bypassing of flow through the cross-section over the fins. For both the flat chip and the finned chip there are crisis points where the two-phase flow becomes unstable at low coolant velocities. The practice of degassing produced negligible effects on boiling heat transfer in the 1-mm high channel.

pages 69-76

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