Onset of Penetrative Convection in a Multilayered Heat-generating Porous System with Thin Air Interlayers

Kolchanova, Ekaterina; Kolchanov, N.V.

doi:10.1007/s12217-023-10043-2

Cited by 3 publications

(1 citation statement)

References 43 publications

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“…≤ ≤ Very recently, the impact of heat generation on multilayered air-porous configuration was investigated by Kolchanova and Kolchanov. 42 For instance, it is important to maintain the appropriate temperature regime in an area where agricultural raw materials are stored (such as hay and root crops), as these materials tend to overheat owing to biological activity. With the strength of the heating element proportional to the relative quantity of the solid phase, the materials create an air-porous configuration.…”

Section: Introductionmentioning

confidence: 99%

Effects of throughflow and internal heating in a composite air‐porous medium

Gangadgaraiah

2024

Heat Trans

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The effect of an internal heat source linearly dependent on the solid fraction on the onset of convection in a composite air‐porous channel with vertical throughflow has been analyzed. We considered boundaries to be insulating to temperature perturbations. The governing equation that satisfies the air‐porous configuration is analyzed by the normal mode approach, solved by the regular perturbation technique for linear stability, and the critical internal Darcy–Rayleigh number for the onset of stationary convection has been derived. The paper aims to analyze the effects of parameters like heat source size, depth ratio, Darcy number, throughflow direction, solid fraction, and Prandtl number on stationary convection in a composite air‐porous configuration. Understanding these influences can illuminate thermal behaviors in intricate systems and inform applications in heat transfer and fluid dynamics. The observed stability configuration decreases monotonically due to increasing the effect of the depth ratio and solid fraction at any direction and velocity of the throughflow. The thermal and vertical velocity profiles and the results obtained during the analysis have been presented graphically.

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Section: Introductionmentioning

confidence: 99%

Effects of throughflow and internal heating in a composite air‐porous medium

Gangadgaraiah

2024

Heat Trans

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Effect of air layer location and depth on redistribution of convective heat transfer induced by energy source in a sandwiched porous-air-porous enclosure free from temperature difference at external boundaries

Kolchanova,

Kolchanov

2023

International Communications in Heat and Mass Transfer

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Coupled Effect of Solid Fraction and Internal Energy Source on Convective Heat Transport in Three-Layered Air-Porous-Air Domain: Comparison With Different Two-Layered Domains

Kolchanova,

Sagitov

2023

Interfac Phenom Heat Transfer

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This paper studies convective heat transport driven by a uniform internal energy source coupled with the solid fraction in the partial air-saturated porous domains bounded by the top and bottom impermeable thermally conductive surfaces. The consideration of the coupled effect distinguishes our work from the papers of previous authors. We provide a comprehensive numerical study of internal convection and compare results of the linear stability analysis for three distinct domains. The first domain is air-porous-air (APA), where the heat-generating porous matrix is between the upper and lower air layers. In the second air-porous (AP) domain, the air layer overlays the porous medium. In the third porous-air (PA) domain, the air layer underlays the porous medium. The bimodal marginal stability curves and regime map with a demarcation line between the local and large-scale convective flows are obtained only for the APA and AP domains due to the division of each domain into the upper unstably stratified and lower stably stratified parts. The local convection cannot originate in the PA domain because the air layer belongs to the lower stably stratified part. A remarkable destabilizing effect of additional air layers has been revealed. For example, at the fixed solid fraction of 0.1, we achieve a 40-fold reduction of the critical Darcy-Rayleigh number in the APA domain by increasing the depth ratio from 0 to 0.5, and by 14 times in the AP domain and only by 3.5 times in the PA domain. The destabilizing effect enhances with increases in the solid fraction.

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Onset of Penetrative Convection in a Multilayered Heat-generating Porous System with Thin Air Interlayers

Cited by 3 publications

References 43 publications

Effects of throughflow and internal heating in a composite air‐porous medium

Effects of throughflow and internal heating in a composite air‐porous medium

Effect of air layer location and depth on redistribution of convective heat transfer induced by energy source in a sandwiched porous-air-porous enclosure free from temperature difference at external boundaries

Coupled Effect of Solid Fraction and Internal Energy Source on Convective Heat Transport in Three-Layered Air-Porous-Air Domain: Comparison With Different Two-Layered Domains

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