Simulation Of Flow Of Nanofluids By BEM
Author(s)
J. Ravnik & L. Škerget
Abstract
Heat transfer is one of the major engineering problems, which has to be addressed
when progress is made in engineering technology. Low thermal conductivity
of fluids such as water or oil, led to the introduction of nanofluids – stable
suspensions of nanosized particles in base fluid. Nanofluids have very high thermal
conductivities at very low nanoparticle concentrations and are able to substantially
increase heat transfer.
Numerical solver for simulation of flow and heat transfer of nanofluids was
developed using Boundary Element Method. Velocity-vorticity formulation of
Navier-Stokes equations is proposed for nanofluids and solved by a combination
of single domain and sub-domain boundary elementmethod. The developed solver
was used to simulate three-dimensional natural convection of nanofluids. Results
of simulations show that a substantial heat transfer enhancement can be observed
and attributed to the usage of nanofluids. We observed that the nanofluid particle
volume fraction also plays in important role increasing the volume fraction
increases the heat transfer for all Rayleigh number values considered.
Keywords: nanofluids, boundary element method, natural convection.
1 Introduction
Nanofluid is a suspension consisting of uniformly dispersed and suspended
nanometre-sized (10–50 nm) particles in base fluid, pioneered by Choi [1].
Nanofluids are used to replace low thermal conductivity working fluids such as
water, oil or ethylene glycol. Nanofluids have very high thermal conductivities at
very low nanoparticle concentrations.
Buoyancy induced flow and heat transfer is an important phenomenon used in
various engineering systems. Increased thermal conductivity of nanofluids plays a
crucial role in the enhancement of heat transfer especially in slow, low Rayleigh
Keywords
nanofluids, boundary element method, natural convection
Related Book
Other papers in this volume
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