Numerical Heat Transfer by Nanofluids in a wavy walls Microchannel using Dispersion Method

Document Type : Research Article

Authors

1 Department of Mechanical Engineering, Razi University

2 Department of mechanical engineering, Amirkabir University of Technology

3 Amirkabir University of Technology

Abstract

In this paper, conjugate heat transfer in wavy microchannels filled with nanofluid is studied numerically. To simulate the nanofluids, dispersion and homogeneous methods in single-phase model and Eulerian-Lagrangian method in two-phase model are used. Homogeneous method underestimates the experimental results. Then, nanofluid simulated by two-phase model using an Eulerian-Lagrangian approach. Then its results are used to find the unknown parameter in the conduction relation of nanofluid in dispersion method. Nanofluids are water-Cu or water-Al2O3 suspensions with a particle diameter of 100-150nm and a volume fraction of up to 2%. The three-dimensional governing equations including continuity, Navier-Stokes and energy equations are solved by the well-known SIMPLE method. The governing equations for particles are solved by a 4th order Runge-Kutta algorithm. due to the 3-D governing equation four equations includinf velocity components and energy should be solved for all particles. The computer program has been written in parallel processing method (MPI). Then a super computer with several CPU,s should be used. Using dispersion method is as simple as homogeneous method but has accuracy as two-phase Eulerian-Lagrangian method.

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References

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Amirkabir Journal of Mechanical Engineering
Volume 51, Issue 4
September and October 2019
Pages 121-130

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