Title

Forced Convection Boiling from a Nonflush Simulated Electronic Chip

Document Type

Article

Publication Date

1993

Publication Source

Journal of Thermophysics and Heat Transfer

Abstract

An experimental investigation has been undertaken to determine the effect of heated surface height on forced convective boiling. An inert fluorocarbon, FC-72 (3M Industrial Chemical Products Division) is circulated through a vertical rectangular channel at velocities of 1-4 m/s and subcoolings of 20 and 35 C. Results for five surface heights, as measured relative to the flow channel wall, were obtained. These were 0.127-mm recessed, 0.229-, 0.457-, and 0.635-mm protruded and flush with the flow channel wall. A reduction in critical heat flux (CHF) occurred at low velocities, while an increase occurred at higher velocities for the protruded cases. A reduction of CHF occurred at all velocities for the recessed condition. Additional results in the velocity range of 5-7 m/s are presented for the flush condition. This data shows that for velocities greater than 4 m/s, CHF becomes weakly dependent on the Weber number. Weak dependence on Weber number also implies a direct proportionality to velocity and a weak dependence on heated length.

Inclusive pages

588-594

ISBN/ISSN

0887-8722

Comments

Permission documentation is on file.

Publisher

American Institute of Aeronautics and Astronautics

Volume

7

Issue

4

Peer Reviewed

yes