Laminar heat transfer of non-Newtonian nanofluids in a circular tube |
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| Authors: | Mohammad Hojjat Seyed Gholamreza Etemad Rohollah Bagheri |
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| Affiliation: | (1) Department of Chemical Engineering, Isfahan University of Technology, 84156-83111 Isfahan, Iran;(2) Department of Chemical and Biological Engineering, University of Ottawa, Ottawa, ON, K1N 6N5, Canada;(3) Present address: Chemical Engineering Department, Islamic Azad University, Quchan Branch, Quchan, Iran; |
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| Abstract: | Forced convection heat transfer behavior of three different types of nanofluids flowing through a uniformly heated horizontal
tube under laminar regime has been investigated experimentally. Nanofluids were made by dispersion of γ-Al2O3, CuO, and TiO2 nanoparticles in an aqueous solution of carboxymethyl cellulose (CMC). All nanofluids as well as the base fluid exhibit shear-thinning
behavior. Results of heat transfer experiments indicate that both average and the local heat transfer coefficients of nanofluids
are larger than that of the base fluid. The enhancement of heat transfer coefficient increases by increasing nanoparticle
loading. At a given Peclet number and nanoparticle concentration the local heat transfer coefficient decreases by axial distance
from the test section inlet. It seems that the thermal entry length of nanofluids is greater than the base fluid and becomes
longer as nanoparticle concentration increases. |
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