Numerical investigation of nanofluids heat transfer in a channel consisting of rectangular cavities by lattice Boltzmann method

Pouria Ranjbar (), Rasul Mohebbi () and Hanif Heidari
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Pouria Ranjbar: School of Mathematics and Computer Science, Damghan University, Damghan, Iran
Rasul Mohebbi: #x2020;School of Engineering, Damghan University, Damghan, Iran
Hanif Heidari: School of Mathematics and Computer Science, Damghan University, Damghan, Iran

International Journal of Modern Physics C (IJMPC), 2018, vol. 29, issue 11, 1-23

Abstract: In this study, lattice Boltzmann method (LBM) simulation is performed to investigate laminar forced convection of nanofluids in a horizontal parallel-plate channel with three rectangular cavities. Two cavities are considered as located on the top wall of the channel and one on the bottom wall. The effects of the Reynolds number (100–400), the cavity aspect ratio (AR = 0.25, 0.5), the various distances of the cavities from each other (Xc′) at different solid volume fractions of nanofluids (ϕ=0−0.05) on the velocity and the temperature profiles of the nanofluids are studied. In addition, the flow patterns, i.e. the deflection and re-circulation zone inside the cavities, and the local and averaged Nusselt numbers on the channel walls are calculated. The results obtained are used to ascertain the validity of the written numerical code, which points to the excellent agreement across the results. The results show that, as the solid volume fraction of nanofluids is enhanced, the transfer of heat to working fluids increases significantly. Further, the results show that the maximum value of the averaged Nusselt number in the channel is obtained at Xc′=0.1204 for AR = 0.5 and Xc′=0.1024 for AR = 0.25. The interval [0.1224, 0.1304] is the best position for the second cavity. It is concluded that the results of this paper are very useful for designing optimized heat exchangers.

Keywords: Nanofluids; heat transfer; LBM; channel; cavities (search for similar items in EconPapers)
Date: 2018
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DOI: 10.1142/S0129183118501085

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