The Effect of Asymmetrically Confined Circular Cylinder and Opposing Buoyancy on Fluid Flow and Heat Transfer

Abstract

In this paper, a two-dimensional numerical investigation is carried out to understand the effects of opposing thermal buoyancy and Prandtl number on fluid flow and mixed convection heat transfer characteristics of symmetrically and asymmetrically confined cylinder submerged in Newtonian fluid. The detailed flow and temperature field are illustrated in term of streamlines and isotherm contours to interpret the flow and thermal transport visualization. The numerical results are presented and discussed for the range of conditions as: Ri = 0 to -4, Pr = 0.7 to 50, eccentricity factor ε = 0 to 0.7 at Re = 40 and for a fixed blockage parameter B = 0.2. The effect of opposing buoyancy is brought about by varying Richardson numbers. The overall drag coefficient and average Nusselt number are computed to elucidate the role of Prandt number, eccentricity factor and Richardson number on the flow and heat transfer. At ε = 0, it is found that, when the buoyancy is opposed the flow becomes asymmetrically and some rotating zones appear under and above the cylinder. Moreover, the eccentricity factor has a tendency to decrease the rotating regions and to increase the heat transfer rate. For example an increase in eccentricity factor from 0 to 0.6 increases Nu by 77% at Ri = 4.

The Effects of Aiding and Opposing Thermal Buoyancy on Downward Flow around a Confined Circular Cylinder

“…The accuracy of the numerical simulation is validated and presented in our earlier works [1] and [14] for Nusselt number dependence on Reynolds number for various Richardson number and Prandtl number.…”

“…Very small size control volume near the surface is adopted with a total number of cells 120358 elements. The mesh sizes as well as the upstream and downstream distances are adopted after performing a comprehensive grid independency study which presented in our earlier works [1] and [14].…”

“…The average Nusselt number and other flow characteristic parameter are presented to determine the effect of aiding thermal buoyancy. Laidoudi and Bouzit [14] simulated the incompressible Newtonian flow over a confined circular cylinder in horizontal channel under the effect thermal buoyancy.…”

Magnetohydrodynamics and Power-Law Fluids in Double Lid-Driven Cavity With Semi-Circular Bodies

“…Studies have shown that the heat transfer of fluids is related to a set of criteria mainly connected to the geometric shape of the system and the fluid quality (Maneengam et al 2022;Laidoudi and Bouzit 2018;Aliouane et al 2021;Selimefendigil 2019;Alsabery et al 2020;Gangawane et al 2018). Geometry has an effect on the fluid motion allowing for an effect on heat transfer (Laidoudi and Bouzit 2017;Herouz et al 2022;Anouar and Mokhefi 2022;Laidoudi, 2020). However, the quality of the fluid affects the thermal properties, which affects the heat capacity and thermal conductivity of the fluid (Abderrahmane et al 2023;Laidoudi and Ameur 2020;Mohebbi and Rashidi 2017;Usman et al 2019;Laidoudi and Ameur 2022).…”

Behavior of Non-Newtonian Fluid in a Lid-Driven Chamber With Heated Bodies Subjected to a Uniform Magnetic Field

“…All studies related to thermal activity aim to find possible solutions to accelerate heat transfer. A thermal system often consists of hot and cold elements immersed in a fluid such as air, water or some other type of fluid (Al-Kouz et al, 2021;Laidoudi, and Bouzit, 2017a;Hussain et al, 2019). It can be said that thermal systems are present in all industries and technology applications such as high-precision cooling systems, heat exchangers, nuclear stations, solar energy systems and other applications.…”