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# NUMERICAL SIMULATION OF NATURAL CONVECTION HEAT TRANSFER IN NANOFLUIDS

Meor Said, Mior Azman (2005) NUMERICAL SIMULATION OF NATURAL CONVECTION HEAT TRANSFER IN NANOFLUIDS. PhD thesis, Universiti Teknologi Petronas.

## Abstract

The goal of this thesis is to model the behavior of the nanofluids so that their performances can be evaluated analytically and computationally. In this thesis, we consider analytical models that describe molecular viscosity f.!, thermal conductivity k. density p, specific heat c" and the coefficient of thermal expansion f3 for a nanofluid in terms of volume fraction ljJ of nanoparticles, size of the nanoparticles (e.g radius of the nanoparticle, rp), size of the base fluid molecule (e.g. radius of the liquid molecule, r1) and the temperature T. In order to validate these analytical models, we study numerically the natural convection heat transfer in a closed pipe using the commercially available CFD software FLUENT 6.0, since the experimental data is available for this configuration. In particular, we study the natural convection flow field in two configurations of L/0=0.5 and LID=l.O, where L is the length of the pipe and D is the diameter. For nanofluids, we consider the suspensions of Ab03 and CuO particles in water. Three cases with volume fraction ljJ = 0, l% and 4% for both AhOJ and CuO are considered. It is assumed that the nanoparticles of AbOJ or CuO are uniformly suspended in water; there is no aggregation of nanoparticles in the fluid medium. It is shown that the use of experimentally measured values of k. or the kinetic model of k, gives better correlation with experimental data for heat transfer compared to the Maxwell model.

Item Type: Thesis (PhD) Academic Department - Mechanical Engineering - Materials - Engineering materials - Polymers - Flow simulation T Technology > TJ Mechanical engineering and machinery Engineering > Mechanical Users 2053 not found. 30 Sep 2013 16:55 25 Jan 2017 09:46 http://utpedia.utp.edu.my/id/eprint/8037