Library Subscription: Guest
IHTC DL Home Archives Officers Future meetings Assembly for International Heat Transfer Conferences

EXPERIMENTAL STUDY OF PERFORMANCE OF LOOPED AND UNLOOPED PULSATING HEAT PIPES

DOI: 10.1615/IHTC13.p22.340
page 12

Masahiro Kawaji
City College of New York, 160 Convent Avenue, New York, NY 10031, USA

K. Nikkanen
University of Toronto, Toronto, Canada

C. G. Lu
University of Toronto, Toronto, Canada

Abstract

Pulsating heat pipes have been fabricated using multi-port extrusion tubing and their performance has been studied for potential use in cooling of microelectronics components. Experiments have been conducted on four MPE tubing heat pipes with different internal structures: rectangular channel looped, rectangular channel unlooped, triangular channel looped, and triangular channel unlooped. The effects of the number of parallel channels in a serpentine geometry, working fluid and fill ratio on the heat pipe performance have been determined by measuring the temperature distributions over the entire surface of the heat pipe using an infrared thermal imaging camera under different heater power levels. The analyses of the heat transport data have revealed significant variations in the performance depending on the number of parallel channels, working fluid and fill ratio. It was found that most of the heat pipes performed better with ethanol than deionized water. Only the looped rectangular channel heat pipe performed satisfactorily with deionized water, which is attributed both to the larger channel size and the looped architecture. The unlooped heat pipes performed best at the lowest fill ratios (10%) while the looped heat pipes showed their best performance between 30 and 50% with marked decrease at the lower and higher fill ratios. Also, the larger the number of parallel channels, the better the heat transport characteristics were due to the fact that an oscillating slug flow is more easily induced.

IHTC-13 Digital Library

Measurement of fluid temperature with an arrangement of three thermocouples FLOW BOILING OF A HIGHLY VISCOUS POLYMER SOLUTION