Thermo-hydraulic phenomena of water-Al2O3 nanofluid flow over a rectangular channel with trapezoidal obstacles

Saha, S; Prasad, VR; Beg, OA; Das, AN

Abstract

Numerical simulations of water-Al,O, nanofluid flow in a rectangular channel with two trapezoidal obstacles
have been studied, which has rmarkable effect in various engineering applications. The governing equations
have been solved using SIMPLEC algorithm and FLUENT software has been used to visualize the simulation
results. Motivation of this work is to examine the dynamic behavior of laminar water-Al;O; nanofluid flow for
volume fraction, = 0%, 2%, and 4%. The present study analyzes different hydrothermal flow phenomena
with the variation in obstacle height and &. Moreover, the simulation results, such as the profiles of velocity,
normalized temperature (#6), poiseuille number (C, Re), local Nusselt number (Nu), average Nusselt number
(Nu, J and friction factor (f) have been portrayed with the variations in ¢ and Reynolds number (Re). It has
been observed that the obstacles increase the convective heat transfer (HT) significantly. At Re = 100, for all
the configurations it has been found that the velocity profile become more pronounced for § = 4% as compared
to ¢ = 0%. A linear relationship has been found between the values of f and &. It is also found that an increase
in Re increases vortex length. It is also shown that variation of volume fraction (i) and obstacle height resulted
in an indicative change in the normalized temperature and velocity along the center line. In type-1 obstacle
configuration, it has been found that Nu, increases by 6.6% at ¢ = 2%, and the same increases by 10.73% at
= 4% as compared to that at ¢ = 0%. Moreover, it has been found that in type-2 obstacle configuration, value
of f increases by approximately 7.9% at ¢ = 2% and 13.84% at ¢ = 4% as compared to that at ¢ = 0%.

Citation

Saha, S., Prasad, V., Beg, O., & Das, A. (2023). Thermo-hydraulic phenomena of water-Al2O3 nanofluid flow over a rectangular channel with trapezoidal obstacles. Journal of Nanofluids, 12(5), 1383-1396. https://doi.org/10.1166/jon.2023.2027

• Journal Article Type: Article
• Acceptance Date: May 10, 2023
• Online Publication Date: Jun 1, 2023
• Publication Date: Jun 1, 2023
• Deposit Date: May 12, 2023
• Print ISSN: 2169-432X
• Electronic ISSN: 2169-4338
• Publisher: American Scientific Publishers
• Peer Reviewed: Peer Reviewed
• Volume: 12
• Issue: 5
• Pages: 1383-1396
• DOI: https://doi.org/10.1166/jon.2023.2027