Date:

2025-04-30

Title of Paper:

Flow Boiling Heat Transfer of FC-72 from Silicon Chips Fabricated With Micro-Pin-Fins

Journal:

Int J Thermal Science

Summary:

Experiments were conducted to study the subcooled flow boiling heat transfer performance of FC-72 over
silicon chips. For boiling heat transfer enhancement, two kinds of micro-pin-fins having fin thickness of
50 μm and fin heights of 60 and 120 μm, respectively, were fabricated on the silicon chip surface with
the dry etching technique. The fin pitch was twice the fin thickness. The experiments were conducted
at the fluid velocities of 0.5, 1 and 2 m/s and the liquid subcoolings of 15, 25 and 35 K. The micropin-
finned surfaces showed a sharp increase in heat flux with increasing wall superheat and a large heat
transfer enhancement compared to a smooth surface. The nucleate flow boiling curves for the two micropin-
finned surfaces collapsed to one line showing insensitivity to fluid velocity and subcooling, while the
critical heat flux values increased with fluid velocity and subcooling. The micro-pin-finned surface with
a larger fin height of 120 μm provided a better flow boiling heat transfer performance and a maximum
critical heat flux of 145 W/cm2. The wall temperature at the critical heat flux for the micro-pin-finned
surfaces was less than 85◦C for the reliable operation of LSI chips.

Co-author:

M. Z. Yuan, J. J. Wei*, Y. F. Xue, J. B. Fang

Volume:

48

Page Number:

1416-1422

Translation or Not:

No

Date of Publication:

2009-02-18