THERMAL SCIENCE

International Scientific Journal

Ramakrishna N. Hegde1

,

Shrikantha Rao

,

Ranapratap Reddy

FLOW VISUALIZATION AND STUDY OF CHF ENHANCEMENT IN POOL BOILING WITH AL2O3 - WATER NANO-FLUIDS

ABSTRACT
Pool boiling heat transfer characteristics of Al2O3-Water nanofluids is studied experimentally using a NiCr test wire of 36 SWG diameter. The experimental work mainly concentrated on i) change of Critical Heat Flux(CHF) with different volume concentrations of nanofluid ii) flow visualization of pool boiling using a fixed concentration of nanofluid at different heat flux values. The experimental work revealed an increase in CHF value of around 48% and flow visualization helped in studying the pool boiling behaviour of nanofluid. Out of the various reasons which could affect the CHF enhancement, surface roughness plays a major role in pool boiling heat transfer.
KEYWORDS
nanofluid, CHF, flow visualization, surface roughness
PAPER SUBMITTED: 2010-05-11
PAPER REVISED: 2011-08-27
PAPER ACCEPTED: 2011-08-31
DOI REFERENCE: https://doi.org/10.2298/TSCI100511095H
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2012, VOLUME 16, ISSUE Issue 2, PAGES [445 - 453]
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Flow visualization and study of CHF enhancement in pool boiling with Al2O3 - Water nano-fluids

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