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

Laidoudi, Houssem; Bouzit, Mohamed

doi:10.3311/ppme.11382

Cited by 10 publications

(6 citation statements)

References 13 publications

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“…In order to get accurate results of the interaction between flow and wall of cylinders, the mesh points have a concentration distribution close to cylinders. The methodology of getting mesh is the same used in our previous works (Laidoudi and Bouzit, 2017c).…”

Section: Numerical Methodologymentioning

confidence: 99%

Effect of thermal buoyancy on flow pattern from a pair of side-by-side confined triangular cylinders

Laidoudi

Bouzit

2020

Bangladesh J. Sci. Ind. Res.

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The effects of ax ial and radial thermal buoyancy on fluid flow and mixed convection heat transfer from a pair of identical triangular cylinders in side-by-side arrangement confined within a straight channel. The numerical simulations are carried out by solving continuity, momentum and energy equations using the commercial code ANSYS-CFX. The obtained results are presented and discussed within the range of following conditions: Richardson number Ri = 0 to 2, Reynolds Re = 20, and Prandtl number Pr = 1 at fixed value of blockage ratio β = 0.2. The main results are depicted in terms of streamline and isotherm contours to analyze the fluidic and energetic behaviors. The total drag coefficient and average Nusselt number are also computed. Moreover, a simple correlation indicating the variations of drag coefficient and average Nusselt number versus Richardson number are also provided. It was found that for axial effect of thermal buoyancy, increase in buoyancy strength enhances the heat transfer rate for both cylinders. In other hand, for radial effect, increase in buoyancy strength increases the heat transfer rate of down cylinder and it is reduced for the upper cylinder. Bangladesh J. Sci. Ind. Res.55(1), 9-14, 2020

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Section: Numerical Methodologymentioning

confidence: 99%

Effect of thermal buoyancy on flow pattern from a pair of side-by-side confined triangular cylinders

Laidoudi

Bouzit

2020

Bangladesh J. Sci. Ind. Res.

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“…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).…”

Section: Introductionmentioning

confidence: 99%

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

Benmansour,

Hamoudi

2023

JSSCM

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The use of complex fluids is one of the modern techniques used in small devices in order to enhance their thermal performance. This paper is a numerical study of a complex fluid imprisoned in a chamber with two hot bodies exposed to a magnetic field of constant intensity. The upper and lower walls move horizontally at a constant velocity, while the lateral sides are thermally insulated. The numerical simulation of the system was achieved based on the finite volume method that solves the differential equations of fluid mechanics and heat transfer. Simulations were carried out under the following conditions: Re = 1 to 40, Ri = 0 to 100, n = 0.6 to 1.4 and Ha = 0 to 100. The study showed that the thermal activity of the two bodies is different and related to initial condition. Also, the effect of the magnetic field is strong in the case of shear-thinning fluids, while its effect is diminished in the case of shear-thickening fluids.

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“…Recently, there have been a significant number of researches aimed at studying the heat transfer within thermal exchangers (Mokeddem et al 2019;Alam and Kim 2018;Shirvan et al 2016;Laidoudi and Bouzit 2017a;Nguyen and Ahn 2021). The papers can be classified into two main groups: the first group is concerned with studying the geometry of the heat exchanger (Zimparov 2001;Laidoudi and Bouzit 2018;Kukulka et al 2011;Fan et al 2009;He et al 2019), while the second aims to examine the effect of the fluid quality (Aliouane et al 2021;Aissa et al 2022a;Aissa et al 2022b;Laidoudi et al 2022;Laidoudi and Ameur 2022b). Previous work has been achieved either through real experimental (Peyghambarzadeh et al 2011;Liu et al 2006;Bouvier et al 2003) or through numerical simulations (Laidoudi 2020a;Herouz et al 2023;Mohammed et al 2011).…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation Shear-Thickening Fluid Through a Small-Scaled Heat Exchanger

Hamoudi,

Bouzit

2023

JSSCM

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This paper aims to predict the behavior of a complex fluid though a small-sized thermal exchanger. The fluid used is of shear-thickening type of power-law index (n = 1.4) and Prandtl number (Pr = 50). The Ostwald model was utilized to define the dynamic viscosity. The exchanger consists of three rectangular cross-section tubes placed inside a thermally insulated chamber. The enclosure contains two ports for the entry and exit of the complex fluid. The complex fluid enters the chamber from the first port at a constant speed and at a low temperature, and then it passes around the hot tubes to be cooled. The rheological behavior of a fluid is defined by Ostwald equation, while the intensity of thermal buoyancy was modeled by Boussinesq approximation. The results showed that the increase of the velocity of the flow at the entrance increases the instability of the flow. Increasing the intensity of thermal buoyancy reduces the cooling process of the hot upper body.

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

Abstract: In this paper, two-dimensional

Cited by 10 publications

References 13 publications

Effect of thermal buoyancy on flow pattern from a pair of side-by-side confined triangular cylinders

Effect of thermal buoyancy on flow pattern from a pair of side-by-side confined triangular cylinders

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

Numerical Simulation Shear-Thickening Fluid Through a Small-Scaled Heat Exchanger

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