Optimum design of heat exchanging device for efficient heat absorption using high porosity metal foams

Jadhav, Prakash H.; Gnanasekaran, N.

doi:10.1016/j.icheatmasstransfer.2021.105475

Cited by 22 publications

(6 citation statements)

References 42 publications

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“…The fluid flows through the unoccupied space and channel sections containing metallic foam. In the case of turbulent airflow within the channel's open space, a standard turbulence model is employed, as reported in [45,46]. The following are the governing equations evaluated in accordance with the assumptions stated above [47,48]: 6 -Governing equations for the fluid zone (turbulent flow) :…”

Section: Governing and Turbulent Equationsmentioning

confidence: 99%

Computational insights into the thermal performance enhancement of solar air heater channel through metal foam integration

Al-Chlaihawi,

Hasan,

Kaied

2024

ETJ

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 Fluid flow and heat transfer in an SAH channel with metal foam were simulated  The LTNE and DEF models were used.  The thermo-hydraulic performance of SAH was analyzed, considering several key factors.  Compared to the empty SAH duct, Nu rises 9-10.6 times and friction factor by 53.5-56.6 times.  TPF varies from 2.33 to 2.82 at H f =0.6 and ω=10 PPI.The two-dimensional numerical simulations focused on fluid flow and heat transfer within a solar air heater (SAH) channel incorporating copper metal foam with a porosity of 90% were carried out in this study. The Local Thermal Nonequilibrium (LTNE) and Darcy-Extended Forchheimer (DEF) models were employed to predict fluid and thermal transport in the partially porous SAH channel. In the free flow zone, the turbulence model was utilized. The thermal and thermo-hydraulic performances of SAH were examined concerning several factors, including pore density ( ), Reynolds number ( ), and dimensionless foam height ( ). The results demonstrate that inserting a porous substrate into the SAH can substantially increase heat transmission. This enhancement ranges from 4.4 to 18.04 times compared to an empty duct for at . Moreover, increased porous layer height and pore density lead to a corresponding increase in pressure drop. Evaluating both the improvement in heat transmission and the associated pressure penalty, the case with , and demonstrate superior overall performance, boasting a higher Thermal Performance Factor ( ) of 2.82 when compared to an empty channel. This work presents significant findings on optimizing metal foam applications in SAH systems, offering new insights into the field.

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Section: Governing and Turbulent Equationsmentioning

confidence: 99%

Computational insights into the thermal performance enhancement of solar air heater channel through metal foam integration

Al-Chlaihawi,

Hasan,

Kaied

2024

ETJ

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“…In the case of turbulent airflow within the for clear fluid zone, a standard 𝑘 − 𝜀 turbulence model is employed as reported in (Ali and Ghashim, 2023;Jadhav and Gnanasekaran, 2021). The following are the governing equations evaluated in accordance with the assumptions stated above (Kotresha and Gnanasekaran, 2019;Lin et al, 2016):…”

Section: Governing Equationsmentioning

confidence: 99%

Optimizing of a metal foam-assisted solar air heater performance: a thermo-hydraulic analysis of porous insert placement

Al-Chlaihawi,

Hasan,

Ekaid

2024

Environ Sci Pollut Res

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A numerical assessment of the heat transfer efficacy of a Solar Air Heater (SAH) was carried out. The SAH is supplied with a porous metal foam layer to improve thermal mixing. Both the two temperature equations assuming Local Thermal Non-equilibrium (LTNE) and Darcy-Extended Forchheimer (DEF) models were employed to forecast fluid and thermal transport within the partly filled SAH channel. The analysis was performed for various values of foam layer lengths (𝑆 = 0 − 1), pore densities (𝜔 = 10 − 40 𝑃𝑃𝐼), and Reynolds numbers (𝑅𝑒 = 4000 − 16,000) at a fixed value of layer thickness (𝐻 𝑓 = 0.6). Based on the position of the porous layer, three distinct arrangements, marked as Case 1, Case 2, and Case 3 were explored. Regarding the parameters examined, the findings indicate a definite improvement in the average Nusselt number (𝑁𝑢), but unfortunately, the friction factor also increases unfavorably. By reducing the length of the porous layer, a reasonable reduction in heat transfer rate and a significant decrease in pressure drop were noticed. The results showed about 26.64%, 48.73% and 70.74% reductions in pressure drop by reducing the dimensionless foam length from 1 to 0.25, 0.5 and 0.75 respectively for 𝜔 = 10 at 𝑅𝑒 = 16,000. In contrast there are only about 11.05%, 23.11% and 40.78% reductions in 𝑁𝑢. The exhaustive analysis of the thermal performance of SAH was conducted using the thermal performance factor (TPF), which considers the trade-off between the SAH channel's potential for improved heat transmission and its cost for pressure loss. The TPF may reach a maximum of 2.82 compared to the empty channel when the metal foam layer is inserted with 𝑆 = 1, for 𝜔 = 10, and 𝑅𝑒 = 16,000.

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“…Bhowmick et al (2021) studied the heat transfer characteristics for the Cu-water nanofluid flow through partially filled porous corrugated channels for 5 # Re # 500. Jadhav and Gnanasekaran (2021) conducted an optimization analysis to achieve the economic heat exchange for flow through a wavy channel with the metallic porous slab in a turbulent regime and obtained 27.89% and 32% enhancement of heat transfer for Al and Cu metallic foam, respectively. Kumar et al (2022aKumar et al ( , 2022b investigated the heat transfer characteristics for laminar forced convective flow inside the Laminar forced convective flow porous wavy channel by varying the fluid Prandtl number and concluded that the performance factor increases with increase in fluid Prandtl number and Darcy number.…”

Section: Introductionmentioning

confidence: 99%

“…While increasing the thickness of the porous slab reduces the value of the performance factor for all types of corrugated channels. It is found in the literature that the use of porous media and the wavy channel is an effective means to augment the thermal transport (Ng and Wang, 2010;Yu and Wang, 2013;Bhowmick et al, 2021;Jadhav and Gnanasekaran (2021). However, the flow resistance by the pore decreases the mass flow rate resulting in poor thermal performance.…”

Section: Introductionmentioning

confidence: 99%

Analysis of hydrothermal performance for laminar forced convective flow through a wavy channel with porous blocks

Mehta

Pati

2023

HFF

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Purpose The purpose of this paper is to investigate computationally the hydrothermal characteristics for forced convective laminar flow of water through a channel with a top wavy wall and a flat bottom wall having metallic porous blocks. Design/methodology/approach The governing equations are solved computationally using a finite element method–based numerical solver COMSOL Multiphysics® for the following range of parameters: 10 ≤ Reynolds number (Re) ≤ 500 and 10–4 ≤ Darcy number (Da) ≤ 10–1. Findings The presence of porous blocks significantly influences the heat transfer rate, and the value of local Nusselt number increases with the increase in Da. The value of the average Nusselt number decreases with Da for the top wall and the same is enhanced for the bottom wall of the wavy channel with porous blocks (WCPB). The value of the average Nusselt number for WCPB is significantly higher than that of the wavy channel without porous block (WCWPB), plane channel without porous block (PCWPB) and plane channel with the porous block (PCPB) at higher Re. For PCPB, the performance factor (PF) is always higher than that of WCWPB and WCPB for Da = 10–4 and Da = 10–3. Also, PF for WCPB is higher than that of WCWPB for higher Re except for Da = 10–4. Further, the value of for WCPB is higher than that of PCPB at Da = 10–2 and 10–1 at Re = 500. Practical implications The current study is useful in designing efficient heat exchangers for process plants, solar collectors and aerospace applications. Originality/value The analysis of thermo-hydraulic characteristics for laminar flow through a channel with a top wavy wall and a flat bottom wall having metallic porous blocks have been analyzed for the first time. Further, a comparative assessment of the performance has been performed with a wavy channel without a porous block, a plane channel without a porous block and a plane channel with porous blocks.

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Optimum design of heat exchanging device for efficient heat absorption using high porosity metal foams

Cited by 22 publications

References 42 publications

Computational insights into the thermal performance enhancement of solar air heater channel through metal foam integration

Computational insights into the thermal performance enhancement of solar air heater channel through metal foam integration

Optimizing of a metal foam-assisted solar air heater performance: a thermo-hydraulic analysis of porous insert placement

Analysis of hydrothermal performance for laminar forced convective flow through a wavy channel with porous blocks

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