Energy-saving method of heat transfer enhancement during magneto-thermal convection in typical thermal cavities adopting aspiration

Biswas, Nirmalendu; Chamkha, Ali J.; Manna, Nirmal K.

doi:10.1007/s42452-020-03634-w

Cited by 26 publications

(12 citation statements)

References 39 publications

(50 reference statements)

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“…Chakravarty et al [21] numerically examined the influence of a ventilation method and, the furnishing side injection of cold fluid by the face of the enclosure, on heat management by using the thermal non-equilibrium approach. A novel method was evinced by Bioswas et al [22] in order to enhance heat transfer in thermal enclosures assuming aspiration. It was reported that the heat transfer was ameliorated in all three enclosures owing to aspiration.…”

Section: Introductionmentioning

confidence: 99%

Influence of the Inclination Angle on Mixed Convection and Heat Transfer in a “T” Shaped Double Enclosure

Mourabit¹,

Meknassi²,

Fekkar³

et al. 2023

Fluid Dynamics &Amp; Materials Processing

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The effect of the tilt angle on mixed convection and related heat transfer in a "T" shaped double enclosure with four heated obstacles on the bottom surface is numerically investigated. The considered obstacles are constantly kept at a relatively high (fixed) temperature, while the cavity's upper wall is cooled. The finite volume approach is used to solve the mass, momentum, and energy equations with the SIMPLEC algorithm being exploited to deal with the pressure-velocity coupling. Emphasis is put on the influence of the tilt angle on the solution symmetry, flow structure, and heat exchange through the walls. The following parameters and related ranges are considered: Rayleigh number 10 4 ≤ Ra ≤ 5.10 5 , tilt angle 0°≤ φ ≤ 90°, Reynolds number 100 ≤ Re ≤ 1000, Prandtl number Pr = 0.72, block height B = 0.5, opening width C = 0.15, and distance between blocks D = 0.5. The results reveal different branches of solutions on varying Re and φ. They also show that the symmetry of the solution regarding the P 2 axis is retained for all cases with no tilt and for values of Re between 100 and 1000.

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Section: Introductionmentioning

confidence: 99%

Influence of the Inclination Angle on Mixed Convection and Heat Transfer in a “T” Shaped Double Enclosure

Mourabit¹,

Meknassi²,

Fekkar³

et al. 2023

Fluid Dynamics &Amp; Materials Processing

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“…The findings show that the mechanism of mixed convectives considerably depends on the considered magnetic field inclination angle, bioconvection Rayleigh number, and Richardson number. Biswas et al 43 presented a novel method for improving the heat transfer through MHD convection inside cavities using the free aspiration technique. The developed equations model has been derived using the Maxwell model (for magnetic fields) and the Brinkman–Forchheimer–Darcy model (for porous media).…”

Section: Introductionmentioning

confidence: 99%

Impact of size and location of outflow opening vent on mixed convective heat transfer induced by two aligned heated cylinders immersed in a partially open channel

Saaeed

Ali

2023

Heat Trans

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The current work deals with the numerical investigation of mixed convection occurring from two hot cylinders placed inside vented ducts under different sizes of inflow and locations of outflow opening vents. The mathematical formulation is solved based on the finite volume approach. The location of the outflow section is changed to left, center, and right of enclosure. Impacts of inflow section sizes (italicO ${O}$1 = 0.125 and italicO ${O}$1 = 0.25), locations of outflow section (O2 ${O}_{2}$ = 0.125 $0.125$), space between cylinders (0.3≤S≤0.45 $0.3\le S\le 0.45$), Reynolds number (200≤Re≤400 $200\le Re\le 400$), and Richardson number (0.1≤italicRi≤20 $0.1\le {Ri}\le 20$) are implemented. Findings display that the average Nusselt number (Nu) is exceeded by 20% for low italicRi ${Ri}$ due to the effect of nonsymmetrical inflow and outflow sections as compared with the case of equal opening vents. For large Ri, a higher Nu is obtained for nonequal opening vents in comparison with the case of equal opening vents by 10%. The difference in the average Nu between left and right cylinders is about 11%. Findings display that the enhancement in Nu due to the large spacing size between cylinders as compared with those of low spacing size is about 35%. The variations of Nu display the opening vents ratio, Re, S $S$, and italicRi ${Ri}$ have an extreme action on the characteristics of flow and temperature fields.

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“…Concerning air‐filed enclosures ( Pr = 0.71), the authors found a symmetric flow structure regardless of the Rayleigh number within the studied range. Biswas et al 5 presented an innovative approach for improving magnetohydrodynamic convection heat transfer in thermal cavities by deploying a technique of free aspiration. The authors have demonstrated that a free aspiration system can enhance heat transfer significantly without the need for pumping effort.…”

Section: Introductionmentioning

confidence: 99%

“…It is also noted from the literature review that there is no relationship linking the first and the second laws of thermodynamics except for general definitions. The efficiency of a system was either assessed based on the first law (heat transfer coefficient and Nusselt number), for instance, Biswas et al 5 or the entropy production derived from the second law of thermodynamics. However, the numerical relationship between the first two laws has not been discussed from a numerical viewpoint.…”

Section: Introductionmentioning

confidence: 99%

CFD‐based analysis of entropy generation due to mean and fluctuating fields during turbulent natural convection in a square enclosure

2022

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The current study aims to numerically investigate the entropy generation during the natural convection flow of air in a square cavity. The governing equations for the conservation of mass, momentum, energy, and turbulence are solved using a control volume‐based technique employing the commercial code Fluent. Runs have been performed for both laminar and turbulent flow regimes by varying the Rayleigh number (Ra) from 103 to 1010. On the other hand, various viscous distribution coefficients (ϕ = 10−4, 10−3, and 10−2) and constant Prandtl number (Pr = 0.71) were considered. Given the conflicting perspectives in the literature regarding the entropy generation under turbulent regimes, more research is needed to better understand the impact that the fluctuating flow has on entropy production. The four terms of entropy generation inherent to turbulent natural convection (entropy generation due to dissipation in the mean and the fluctuating velocity fields in addition to the heat flux due to the mean and the fluctuating temperature) are computed in the present work and compared to calculations based on only mean values of temperature and velocity gradients. It was found that taking into account the fluctuating terms of temperatures and velocities augment the total entropy generation by 10.10%, 14.43%, and, 17.70%, up to 32.60%, respectively, for Ra = 5 × 108, Ra = 109, Ra = 1.58 × 109, and Ra = 1010. The gain shows the tendency to increase with the Rayleigh number. Thus, the fluctuating terms cannot be neglected particularly for high Rayleigh numbers. Furthermore, unlike entropy production due to the mean flow field, numerical outcomes reveal that the generated irreversibilities due to fluctuating flow are located around the upper hot and the lower cold corners of the heated walls. In addition, a numerical relationship between the first and the second laws of thermodynamics has been derived. A promising result that emerged from this study has shown that the Nusselt number and therefore the first law of thermodynamics is sufficient to estimate the heat part of entropy generation without the necessity of using the second law.

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Energy-saving method of heat transfer enhancement during magneto-thermal convection in typical thermal cavities adopting aspiration

Cited by 26 publications

References 39 publications

Influence of the Inclination Angle on Mixed Convection and Heat Transfer in a “T” Shaped Double Enclosure

Influence of the Inclination Angle on Mixed Convection and Heat Transfer in a “T” Shaped Double Enclosure

Impact of size and location of outflow opening vent on mixed convective heat transfer induced by two aligned heated cylinders immersed in a partially open channel

CFD‐based analysis of entropy generation due to mean and fluctuating fields during turbulent natural convection in a square enclosure

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