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Second Thermal and Fluids Engineering  Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

COMPARATIVE STUDY OF POOL BOILING HEAT TRANSFER FROM VARIOUS MICROCHANNEL GEOMETRIES

AVDHOOT WALUNJ
National Institute of Technology Karnataka

Alangar Sathyabhama
Department of Mechanical Engineering, National Institute of Technology Karnataka, Surathkal, Mangalore, India-575025

Abstract

The passive technique is adapted to improve the pool boiling performance at reduced incipient temperature by modifying rectangular microchannel. The pool boiling performance of various microchannel geometries is studied at saturated condition of distilled water. The rectangular, parabolic and stepped microchannel are fabricated by wire Electrical Discharge Machining (EDM) on 10 mm diameter circular copper test piece and their boiling characteristics are compared with that of the plain surface. The channel mouth size and channel base width is varied from 250 μm to 800 μm and 500 μm to 800 μm, respectively. The fin tip thickness is varied from 200μm to 500μm. The channel depth is fixed at 500 μm. The effect of channel shape on the boiling heat transfer is presented in this work. The bubble morphology is observed by using high speed camera. Comparative study of bubble departure diameter and bubble frequency has proved the significant performance of parabolic and stepped microchannel. For the different microchannel, enhancement in the heat flux is varied from 182% to 659% and 30-33% reduction in the incipient temperature is noticed at low heat flux range.

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