Baffle and geometry effects on nanofluid forced convection over forward- and backward-facing​ steps channel by means of lattice Boltzmann method

Yuan Ma, Rasul Mohebbi, Mohammad Mehdi Rashidi, Zhigang Yang and Yuhao Fang

Physica A: Statistical Mechanics and its Applications, 2020, vol. 554, issue C

Abstract: In this study, we present a numerical simulation of MWCNT-Fe3O4/water hybrid nanofluid forced convection heat transfer over the forward- and backward-facing steps channel having a baffle fixed on its top wall. A FORTRAN’s homemade code based the lattice Boltzmann method (LBM) is used here. The effects of the Reynolds number (25 ≤Re≤ 100), the volume fraction of nanoparticles (0 ≤ϕ≤ 0.003), the position of baffle (3 ≤X2≤ 7), the length of baffle (0 ≤h≤ 1.5) and the geometry parameter (2 ≤X1≤ 4) on flow pattern and heat transfer characteristics are provided a deep insight. The results indicate that the average Nusselt number is an increasing function of Re and ϕ. The baffle has a significant effect on the flow pattern and heat transfer characteristics. When the length of the baffle increases, the recirculation region behind the backward-facing step shrinks. The average Nusselt number increases by increasing the length of the baffle or moving the baffle towards the backward-facing step.

Keywords: Forward- and backward-facing steps; Baffle; Forced convection; MWCNT-Fe3O4/water hybrid nanofluid; LBM (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:554:y:2020:i:c:s0378437120303447

DOI: 10.1016/j.physa.2020.124696

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