Buoyancy-assisted mixed convection in a vertical channel with spatially periodic wall temperature

Iatridis, A.J.; Sarris, Ioannis E.; Vlachos, N. S.

doi:10.1016/j.ijthermalsci.2012.10.006

Cited by 10 publications

(2 citation statements)

References 34 publications

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“…They studied the flow reversal phenomena at the entry region of channel. Dritselis et al [10] studied buoyancy-assisted mixed convection in a vertical channel with spatially periodic wall temperature. They have observed multicellular regime of flow when Gr/Re value is above a critical ratio.…”

Section: Introductionmentioning

confidence: 99%

Density Modelling in Mixed Convection Flow in a Vertical Parallel Plate Channel

Siddiqui¹

2021

IJHT

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In this paper, a novel way of modelling the density in buoyancy term of mixed convection flow problem is presented using equation of state and Boussinesq approximation without first-order approximation of density with respect to temperature. The presented density model is used to investigate the laminar mixed convection flow in a vertical parallel plate channel under symmetric constant wall heat flux. The results obtained are compared with the results obtained using first-order approximation of density with Boussinesq approximation, and also compared with the results obtained using variable thermophysical properties with negligible viscous dissipation. Investigation is performed on the basis of flow and thermal fields for Re=150 and 300, Ri=0.1 to 25. It is found that the presented density model produces relatively better results, which is able to describe the case of developing flow under constant heat flux condition that is not evident if Boussinesq approximation with first-order approximation of density is used. An appearance of recirculatory cells when reverse flow takes place is also witnessed in vertical channel flow with constant heat flux boundary condition which was not reported earlier.

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Section: Introductionmentioning

confidence: 99%

Density Modelling in Mixed Convection Flow in a Vertical Parallel Plate Channel

Siddiqui¹

2021

IJHT

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“…Mixed convection in finite channels occurred in numerous applications, such as solar systems [8], conventional flat plate collectors [9], and heat exchangers [10]. These studies used theoretical analysis [11], experiments [12] and calculations [13][14][15] to assess the effects of the Reynolds and Richardson numbers on the convection and heat transfer in terms of their respective assistance or opposition buoyancy and in consideration of cases that exhibited heating with high temperature or heat fluxes.…”

Section: Introductionmentioning

confidence: 99%

Energy conservation and heat transfer enhancement for mixed convection on the vertical galvanizing furnace

Mercola

Zhu

et al. 2020

THERM SCI

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The alloying temperature is an important parameter that affects the properties of galvanized products. The objective of this study is to explore the mechanism of conjugate mixed convection in the vertical galvanizing furnace and propose a novel energy conservation method to improve the soaking zone temperature based on the flow pattern and heat transfer characteristics. Herein, the present study applied the k-ε two-equation turbulence model to enclose the Navier-Stokes fluid dynamic and energy conservation equations, and the temperature distributions of the steel plate and air-flow field in the furnace were obtained for six Richardson numbers between 1.91 ⋅ 10 5 and 6.30 ⋅ 10 5. In the industrial practice, the side baffles were installed at the lateral opening of the cooling tower to alter the height of vertical flow passage, which affected the Richardson number. The results indicate that the Richardson number of 2.4 ⋅ 10 5 generated the highest heat absorption and maximal temperature in the steel plate due to the balance between natural and forced convection. Furthermore, the results of the on-line experiments validated the simulation research. The method enhanced the steel plate temperature in the soaking zone without increasing the heat power, thereby characterizing it as energy conservation technology.

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Mixed Convection with Conduction and Surface Radiation from a Vertical Channel with Discrete Heating

Londhe

Rao

2013

J. Inst. Eng. India Ser. C

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Buoyancy-assisted mixed convection in a vertical channel with spatially periodic wall temperature

Cited by 10 publications

References 34 publications

Density Modelling in Mixed Convection Flow in a Vertical Parallel Plate Channel

Density Modelling in Mixed Convection Flow in a Vertical Parallel Plate Channel

Energy conservation and heat transfer enhancement for mixed convection on the vertical galvanizing furnace

Mixed Convection with Conduction and Surface Radiation from a Vertical Channel with Discrete Heating

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