Heat transfer of air turbulent mixed convection in the passive containment air-cooling system of a modular small nuclear reactor

Dong, Caihua; Lu, Guoqing; Chen, Ronghua; Zhang, Kui; Liu, Changliang; Tian, Wenxi; Qiu, Suizheng; Su, G.H.

doi:10.1016/j.ijthermalsci.2022.107793

Cited by 18 publications

(2 citation statements)

References 40 publications

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“…Mixed convection arises when both natural and forced convection mechanisms interact to transfer heat. This mode of transporting heat features significantly in thermal engineering due to its wide use in cooling of electronic and computer gadgets, heat exchangers, 1–6 and nuclear reactors 7,8 . Heat transfer in vented enclosures could be improved by using baffles 9–12 .…”

Section: Introductionmentioning

confidence: 99%

“…This mode of transporting heat features significantly in thermal engineering due to its wide use in cooling of electronic and computer gadgets, heat exchangers, [1][2][3][4][5][6] and nuclear reactors. 7,8 Heat transfer in vented enclosures could be improved by using baffles. [9][10][11][12] Improvement in the capability of vented enclosures in exchanging heat is of significant research interest due to its importance in engineering and industry applications.…”

Section: Introductionmentioning

confidence: 99%

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Numerical investigation of mixed convection of non‐Newtonian fluid in a vented square cavity with fixed baffle

Ghurban,

Al‐Farhany,

Olayemi

2023

Heat Trans

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This paper numerically investigates mixed convective heat transfer in a vented square cavity incorporated with a baffle that is subjected to external non‐Newtonian fluids (NNFs). Adiabatic conditions are imposed on the top and bottom walls, while cold temperature conditions are applied to the right and left solid boundaries. Heated NNF enters the cavity through the inlet and goes out through the outlet at three different locations, and it passes on a vertical baffle fixed at the base placed at different lengths. To examine the impact of the inlet and outlet positions, three different shapes of the outlet port located on the right wall and the inlet port on the left bottom wall were investigated. The impacts of Reynolds number (Re) of 100 ≤ Re ≤ 1000, Richardson number (Ri) of 0.1 ≤ Ri ≤ 3, power law index (n) of 0.6 ≤ n ≤ 1.4, length of baffle (Lb) of 0.2 ≤ Lb ≤ 0.6 and the outlet hole positions (S) of on the thermal and flow distributions in the cavity are taken into consideration in this paper. The results demonstrated that the flow's intensity and heat transfer increase with improvement in the Re and n at any baffle length. When the Ri increased from 0.1 to 3, increased by 23.3% at , and 13.8% at . Also, the Ri increment results in the augmentation of the average heat transfer.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical investigation of mixed convection of non‐Newtonian fluid in a vented square cavity with fixed baffle

Ghurban,

Al‐Farhany,

Olayemi

2023

Heat Trans

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Mixed convective heat transfer in a square cavity filled with power‐law fluids under active flow modulation

Mia,

Abdullah,

Das

et al. 2024

Heat Trans

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The current study presents a computational investigation of mixed convective heat transfer in a square enclosure containing power‐law fluid. An active flow modulator is employed in the form of a flat plate with negligible thickness, and the mixed convection is achieved through clockwise rotation of the plate. The rotation of the plate is modeled by incorporating a moving mesh technique. The solution is then obtained by applying the Finite Element Technique under the arbitrary Lagrangian–Eulerian framework. Numerical validation is performed with contemporary research studies consisting of rotating plates to justify the accuracy of the present study. The study is conducted at constant Prandtl number Pr = 1.0 and Reynolds number Re = 500 while varying the power‐law index (0.6 ≤ n ≤ 1.4) and the Richardson number (0.1 ≤ Ri ≤ 10.0). The results have been presented in terms of the flow and thermal fields, spatially averaged Nusselt number, spatially averaged power consumption by the plate, and the velocity and temperature profile in the enclosure. The numerical findings indicate that a higher Richardson number encourages heat transfer. For the shear‐thinning fluid, a 37% thermal augmentation is observed in comparison to the Newtonian fluid at Ri = 10. However, in the case of shear‐thickening fluid, thermal performance was reduced by 21.13%. Small thermal oscillations are observed in naturally dominated mixed convection for shear‐thinning fluids, but none are observed for shear‐thickening or Newtonian fluids. In addition, the findings demonstrate that the flow modulator has a positive impact on heat transfer for the shear‐thickening fluids (n > 1) and an adverse effect for the shear‐thinning fluids (n < 1). Furthermore, the power consumption decreases as Ri increases, and it becomes negative beyond Ri = 1.0 due to the increase in natural convection strength.

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Experimental study on turbulent natural convection of air between the open-ended parallel plates with one-side heating

Dong

Lu²,

Chen³

et al. 2023

Annals of Nuclear Energy

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Heat transfer of air turbulent mixed convection in the passive containment air-cooling system of a modular small nuclear reactor

Cited by 18 publications

References 40 publications

Numerical investigation of mixed convection of non‐Newtonian fluid in a vented square cavity with fixed baffle

Numerical investigation of mixed convection of non‐Newtonian fluid in a vented square cavity with fixed baffle

Mixed convective heat transfer in a square cavity filled with power‐law fluids under active flow modulation

Experimental study on turbulent natural convection of air between the open-ended parallel plates with one-side heating

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