Convective Heat Transfer Characteristics of Silver-Water Nanofluid Under Laminar and Turbulent Flow Conditions

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Author list: Godson L., Raja B., Mohan Lal D., Wongwises S.

Publisher: American Society of Mechanical Engineers

Publication year: 2012

Journal: Journal of Thermal Science and Engineering Applications (1948-5085)

Volume number: 4

Issue number: 3

ISSN: 1948-5085

eISSN: 1948-5093

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84863769057&doi=10.1115%2f1.4006027&partnerID=40&md5=e3ed3287b52168b462a78d9fc53eabac

Languages: English-Great Britain (EN-GB)

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Abstract

The convective heat transfer coefficient and pressure drop of silver-water nanofluids is measured in a counter flow heat exchanger from laminar to turbulent flow regime. The experimental results show that the convective heat transfer coefficient of the nanofluids increases by up to 69% at a concentration of 0.9 vol. % compared with that of pure water. Furthermore, the experimental results show that the convective heat transfer coefficient enhancement exceeds the thermal conductivity enhancement. It is observed that the measured heat transfer coefficient is higher than that of the predicted ones using Gnielinski equation by at least 40%. The use of the silver nanofluid has a little penalty in pressure drop up to 55% increase 0.9% volume concentration of silver nanoparticles. ฉ 2012 American Society of Mechanical Engineers.

Keywords

Convective heat transfer, Laminar, pressure drop, Transition, Turbulent