Optimization of thermosolutal convection in vertical porous annulus with a circular baffle

Pushpa, B. V.; Sankar, M.; Makinde, Oluwole Daniel

doi:10.1016/j.tsep.2020.100735

Cited by 23 publications

(4 citation statements)

References 35 publications

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“…Several studies on convection in a cavity embedded with a thin baffle at its surface have been conducted to examine the baffle effect on fluid movement characteristics along with thermal performances in finite-sized geometries (Frederick, 1989; Bilgen, 2005; Shi and Khodadadi, 2003; Ben-Nakhi and Chamkha, 2006; Pushpa et al , 2020; Sheikhzadeh et al , 2013; Bendaraa et al , 2019; Hussein et al , 2022; Ma et al , 2019). In-depth analyses of baffle effects in a square domain have been conducted, and it has been discovered that the flow movement varies significantly with the thickness and length of the baffle (Nag et al , 1994; Frederick and Valencia, 1989).…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of nanofluid buoyant flow behavior and heat transfer characteristics in annular-shaped enclosure with internal baffle

Reddy,

Yoon,

Mani

et al. 2023

HFF

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Purpose Natural convection in finite enclosures is a common phenomenon in various thermal applications. To provide the thermal design guidelines, this study aims to numerically explore the potential of using internal baffles and nanofluids to either enhance or suppress heat transport in a vertical annulus. Furthermore, the annular-shaped enclosure is filled with aqueous-silver nanofluid and the effects of five distinct nanoparticle shapes are examined. In addition, the influence of baffle design parameters, including baffle position, thickness and length, is thoroughly analyzed. Design/methodology/approach The finite difference method is used in conjunction with the alternating direction implicit and successive line over relaxation techniques to solve nonlinear and coupled partial differential equations. The single phase model is used for nanofluid which is considered as a homogeneous fluid with improved thermal properties. The independence tests are carried out for assessing the sufficiency of grid size and time step for obtaining results accurately. Findings The baffle dimension parameters and nanoparticle shape exhibit significant impact on the convective flow and heat transfer characteristics, leading to the following results: sphere- and blade-shaped nanoparticles demonstrate around 30% enhancement in the heat transport capability compared with platelet-shaped nanoparticles, which exhibit the least. When considering the baffle design parameter, either a decrease in the baffle length and thickness or an increase in baffle height leads to an improvement in heat transport rate. Consequently, a threefold increase in baffle height yields a 40% improvement in thermal performance. Originality/value Understanding the impact of nanoparticle shapes and baffle design parameters on flow and thermal behavior will enable engineers to provide valuable insight on thermal management and overall system efficiency. Therefore, the current work focuses on exploring buoyant nanofluid flow and thermal mechanism in a baffled annular-shaped enclosure. Specifically, an internal baffle that exhibits conductive heat transfer through it is considered, and the impact of baffle dimensions (thickness, length and position) on the fluid flow behavior and thermal characteristics is investigated. In addition, the current study also addresses the influence of five distinct nanoparticle shapes (e.g. spherical, cylindrical, platelet, blade and brick) on the flow and thermal behavior in the baffled annular geometry. In addition to deepening the understanding of nanofluid behavior in a baffled vertical annulus, the current study contributes to the ongoing advancements in thermal applications by providing certain guidelines to design application-specific enclosures.

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Section: Introductionmentioning

confidence: 99%

Numerical investigation of nanofluid buoyant flow behavior and heat transfer characteristics in annular-shaped enclosure with internal baffle

Reddy,

Yoon,

Mani

et al. 2023

HFF

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“…Sankar and co-researchers performed numerical study to analyze the impact of porous medium on thermosolutal convection in the annular enclosure subjected to discrete heating [21,22]. The same study with uniform heating/cooling has been extended by Pushpa et al [23] by considering the impact of thin baffle fixed to the interior cylinder of the annulus. Earlier, Saied and pop [24] adopted Darcy model to analyze the impact of porous medium on heat transfer rate by mounting isoflux/isothermal heat source on left wall and reported that the global Nusselt number enhances with heater length.…”

Section: Introductionmentioning

confidence: 99%

Impact of thermal and solute source-sink combination on thermosolutal convection in a partially active porous annulus

Kemparaju¹,

Swamy

Sankar³

et al. 2022

Phys. Scr.

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The objective of the current paper is to investigate the thermosolutal flow along with heat and mass dissipation rates in an upright porous annular space subjected to discrete heating and salting along the vertical boundaries with insulated and impermeable horizontal boundaries. To solve the model equations, an implicit finite difference scheme with over relaxation technique has been implemented. The numerical predictions focus specifically on the effect of buoyancy ratio, Lewis number, Darcy number and source-sink arrangements on fluid flow behavior, thermal and solutal characteristics, average Nusselt and Sherwood numbers. The simulations were performed for an extensive range of dimensionless parameters (-10≤ N ≤ 10, 0.1 ≤ Le ≤ 1, 10-5 ≤ Da ≤ 10-1) by considering two different types of source-sink arrangements and found that the flow circulation strength is maximum with in-line arrangement of source and sink compared to alternative arrangement. Also, we found that in case-I, regardless of Lewis number, the maximum heat and mass dissipation rates takes place through top source during opposing flow, and through bottom source for aided flow. However, in case-II arrangement, irrespective to type of flow, the greater amount of heat and mass transport is found through the bottom source at the inner cylinder compared to top source placed at outer cylinder.

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“…Porous media are being extensively utilized in a wide range of applications from enhancing the performance of power generation units to controlling the temperature of electronic circuits, healthcare products, and so on [1], [2], [3], [4]. Such a great popularity has been the trigger for many investigations in the field [5], [6], [7], and among different topics, modeling the performance has been taken into account as one of the hottest subjects in the area [8], [9], [10].…”

Section: Nomenclature 1 Introductionmentioning

confidence: 99%

Acquiring an analytical solution and performing a comparative sensitivity analysis for flowing Maxwell upper-convected fluid on a horizontal surface

Hoseinzadeh

Sohani

Shahverdian

et al. 2021

Thermal Science and Engineering Progress

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Optimization of thermosolutal convection in vertical porous annulus with a circular baffle

Cited by 23 publications

References 35 publications

Numerical investigation of nanofluid buoyant flow behavior and heat transfer characteristics in annular-shaped enclosure with internal baffle

Numerical investigation of nanofluid buoyant flow behavior and heat transfer characteristics in annular-shaped enclosure with internal baffle

Impact of thermal and solute source-sink combination on thermosolutal convection in a partially active porous annulus

Acquiring an analytical solution and performing a comparative sensitivity analysis for flowing Maxwell upper-convected fluid on a horizontal surface

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