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Journal ArticleDOI

Thermal analysis of nanofluid saturated in a semicircular hot enclosure cooled by a rotating half-immersed active circular cylinder subject to a convective condition

01 Jan 2022-Vol. 51, Iss: 1, pp 22-66
About: The article was published on 2022-01-01. It has received None citations till now. The article focuses on the topics: Nanofluid & Cylinder.
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Journal ArticleDOI
TL;DR: In this article, the influence of a rotating cylinder on the performance of mixed convection in a square enclosure with a rotating cylindrical cylinder centered within it is numerically studied.

158 citations

Journal ArticleDOI
TL;DR: In this paper, the authors investigated the entropy generation due to conjugate natural convection-conduction heat transfer in a square domain under steady-state condition, and the results showed that both the average Nusselt number and entropy generation are increasing functions of K ro while they are maxima at some critical values of D.
Abstract: Entropy generation due to conjugate natural convection–conduction heat transfer in a square domain is numerically investigated under steady-state condition. The domain composed of porous cavity heated by a triangular solid wall and saturated with a CuO–water nanofluid. Equations governing the heat transfer in the triangular solid together with the heat and nanofluid flow in the nanofluid-saturated porous medium are solved numerically using the over-successive relaxation finite-difference method. A temperature dependent thermal conductivity and modified expression for the thermal expansion of nanofluid are adopted. A new criterion for assessment of the thermal performance is proposed. The investigated parameters are the nanoparticles volume fraction φ (0–0.05), modified Rayleigh number Ra (10–1000), solid wall to base-fluid saturated porous medium thermal conductivity ratio K ro (0.44, 1, 23.8), and the triangular solid thickness D (0.1–1). The results show that both the average Nusselt number and the entropy generation are increasing functions of K ro , while they are maxima at some critical values of D . It is also found that the addition of nanoparticles increases the entropy generation. According to the new proposed criterion, the results show that the largest solid thickness ( D = 1.0) and the lower wall thermal conductivity ratio manifest better thermal performance.

142 citations


"Thermal analysis of nanofluid satur..." refers background or methods in this paper

  • ...The equations of the current system are represented by dimensional governing equations subjected to the assumptions presented previously.(3,11,13,30)...

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  • ...Ismael et al.3 numerically investigated the conjugate heat transfer of natural convection with conduction by using a square‐shaped cavity with a porous medium filled with nanofluid (CuO–water)....

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  • ...Ismael et al.(3) numerically investigated the conjugate heat transfer of natural convection with conduction by using a square‐shaped cavity with a porous medium filled with nanofluid (CuO–water)....

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Journal ArticleDOI
TL;DR: In this article, numerical simulation of mixed convection in a partitioned square cavity having CuO-Water nanofluid and superposed porous medium with an adiabatic rotating cylinder is performed.

127 citations


"Thermal analysis of nanofluid satur..." refers background in this paper

  • ...Selimefendigil et al.24 numerically simulated mixed convection in a square‐shaped cavity divided into two parts....

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  • ...Selimefendigil et al.19 numerically investigated mixed convection by adding nanofluid (SiO2) to a square‐shaped cavity....

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  • ...Selimefendigil et al.(24) numerically simulated mixed convection in a square‐shaped cavity divided into two parts....

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Journal ArticleDOI
TL;DR: In this paper, the free convection of copper-water-based nanofluid filling a triangular cavity with semicircular bottom wall was analyzed by inspecting the impacts of Rayleigh number, Hartman number, aspect ratio and the volume fraction of the Cu nanoparticles.
Abstract: This study provides numerical analysis of the free convection of copper–water-based nanofluid filling a triangular cavity with semicircular bottom wall. The cavity sidewalls are maintained at cold temperature, while the semicircular wall is maintained at hot temperature. The other wall segments are thermally insulated. To control the energy transport within the cavity, a uniform magnetic field is applied horizontally. The physical domain is discretized according to the control volume finite element method which has been used to solve the governing equations. The physical and geometrical aspects of the current problem are investigated by inspecting the impacts of Rayleigh number, Hartman number, aspect ratio and the volume fraction of the Cu nanoparticles. Decreasing the radius of the hot semicircle enlarges the average Nusselt number at the absence of the magnetic field. When the magnetic field is applied, this effect is conversed within Ra ≤ 104. This conversed impact does not hold up when Ra is raised to 105. The numerical results are correlated in a sophisticated correlation of the average Nusselt number with other parameters.

126 citations


"Thermal analysis of nanofluid satur..." refers background in this paper

  • ...Dogonchi et al.4 numerically studied the natural convection of nanofluid (CuO–water) in an isosceles triangle cavity....

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  • ...Dogonchi et al.(4) numerically studied the natural convection of nanofluid (CuO–water) in an isosceles triangle cavity....

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Journal ArticleDOI
TL;DR: In this paper, a numerical simulation using a finite volume scheme is carried out for a laminar steady mixed convection problem in a two-dimensional square enclosure of width and height (L), with a rotating circular cylinder of radius (R = 0.2L) enclosed inside it.

123 citations