Numerical Study for Enhancement of Heat Transfer Using Discrete Metal Foam with Varying Thickness and Porosity in Solar Air Heater by LTNE Method

Diganjit, Rawal; Gnanasekaran, N.; Mobedi, Moghtada

doi:10.3390/en15238952

Cited by 7 publications

(7 citation statements)

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“…The impact of various factors on the convection-radiation heat transfer and flow structures within a solar heater Adopting porous substrate into SAH significantly increases the Nusselt number (Nu) [26] Brinkman-Forchheimer extended Darcy model The heat transfer equation has been solved analytically based on the perturbation method Temperature-dependent radiative conductivity was used to evaluate the performance of a porous channel solar collector Radiation has a more significant impact on collector thermal performance and the Nu than the porous shape parameter [31] Brinkman-Forchheimer extended the Darcy model with the LTE model The influence of porous blocks' height, number, permeability, and arrangement were studied For the porous channel, it is confirmed that the extended Darcy-Brinkman-Forchheimer model is the right choice Optimal performance is attained when the inlet and outflow are free of porous blocks [33] Brinkman-Forchheimer extended the Darcy model with the LTE model The thermal characteristics of conjugated porous blocks within FPSC were investigated The highest performance is observed when the height of the block is lower near the inlet and higher near the outflow [34] Darcy -extended Forchheimer model, with LTNE model Utilization of discrete metal foam blocks with varying thickness and porosity in SAH Employing a discrete arrangement of metal foam reduces pressure drop while maintaining effective heat transmission [35] Brinkman-Forchheimer extended the Darcy model with the LTE model Present an innovative design for enhancing the thermal performance of a flat-plate solar collector (FPSC) via porous media…”

Section: Problem Description and Assumptionsmentioning

confidence: 99%

“…Keeping the block's height low near the inlet and high near the outflow produced the best performance factor of 2.163. A numerical investigation was carried out by Diganjit et al [35] to improve heat transmission by utilizing discrete metal foam blocks with varying thickness and porosity in SAH. The Nu improved by 157.64% to 218.60% compared to the empty channel.…”

Section: Introductionmentioning

confidence: 99%

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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: Problem Description and Assumptionsmentioning

confidence: 99%

Section: Introductionmentioning

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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“…Thus, the change in density due to fluid velocity is less than 5%. Hence, the flow is assumed to be incompressible [1,40,48,49]. The experimental parameter assumed for global radiation incident on the SAH, ambient temperature, fluid flow rate, temperature rise across SAH, and fluid inlet temperature are assumed to be within ±50 W/m 2 , ±1 • C, ±1%, ±1 • C, and ±1 • C, respectively, within a 15 min duration [1].…”

Section: Governing Equationsmentioning

confidence: 99%

Thermohydraulic Efficiency of a Solar Air Heater in the Presence of Graded Aluminium Wire Mesh—A Combined Experimental–Numerical Study

2023

Self Cite

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In this work, aluminium wire mesh (WM) samples with 3, 9, and 18 pores per inch (PPI) and porosities of 0.894, 0.812, and 0.917, respectively, were combined together to form graded structures including 3-9-18, 9-18-3, and 18-3-9 PPIs. A 5 mm thickness for each WM was considered for a length of 2 m and inserted into a single-pass solar air heater (SAH) in which the height of the SAH was 120 mm. For the numerical analysis, a 3D numerical model was considered in ANSYS fluent software, and the Rosseland radiation model renormalization group (RNG) k-ε enhanced wall function was incorporated to account for solar radiation. The local thermal equilibrium (LTE) model was considered to obtain the heat-transfer characteristics of the WM. The numerical results of the thermohydraulic performance parameter (THPP) of the 9-18-3 PPI WM were 13.04% and 11.92% higher than the 3-9-18 and 18-3-9 PPI samples, respectively. Later, 25% of the 9-18-3 graded wire mesh (GWM) was considered at four different locations, i.e., 0, 0.5, 1, and 1.5 m away from the inlet, and analysed to obtain the best location for efficient heat transfer. The computational results show that 1.5 m away from the inlet is the best location among the different locations considered. The experimental results of the GWM at 1.5 m away from the inlet demonstrated a 20.91% and 23.32% increase in thermal efficiency compared to the empty channel for the 0.027 kg/s and 0.058 kg/s mass flow rates, respectively. From numerical-cum-experimental analysis, it was found that inserting 25% length of GWM of the entire length of the test section at a distance of 1.5 m from the inlet in single pass SAH improves the overall performance of the empty channel of single-pass SAH.

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“…SAHs have generally low efficiency, so instead of increasing the number of SAHs to meet the energy demand, the main purpose of this study is to increase the efficiency of SAHs. Various kinds of turbulators that are in use are pin fin arrays, [ 1 ] dimples, [ 2 ] rib, [ 3,4 ] matrix, [ 5 ] wire mesh, [ 6 ] and corrugation. [ 7 ] Turbulators are formed in the way of fluid flow to increase turbulence in the channel.…”

Section: Introductionmentioning

confidence: 99%

Thermal Performance Factor of Impinging Jet‐Angled Corrugated Solar Air Heaters

Raheem,

Siddique,

Waheed

et al. 2024

Energy Tech

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Solar energy is a clean and sustainable source of power generation. There are various industrial and domestic applications of Solar Air Heaters (SAHs), but their low thermal efficiency poses a challenge. To improve thermal efficiency, a novel‐angled corrugated jet‐impinging channel has been proposed for the absorbing plate of SAHs. A numerical study has been performed for four different arrangements of jets, i.e., single circular, single square, 2 × 2 square, and 3 × 3 square jet array with four channels, i.e., 30°, 45°, 60°, and 90° corrugated over the Reynolds number range of 1600–2700 for the jet to target plate range of 4.9–15. It is observed that multiple jets impinging increases the heat transfer significantly. The optimization has been performed by instigating the parametric study. Flow and thermal profiles are studied. The 45° corrugated target plate with 3 × 3 multiple jet impingement, 4.9 jet‐to‐target plate distance, and 2700 Reynolds number is chosen to have the best thermal efficiency. A Thermal Performance Factor of around 8 was achieved as compared to the base case.

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Numerical Study for Enhancement of Heat Transfer Using Discrete Metal Foam with Varying Thickness and Porosity in Solar Air Heater by LTNE Method

Cited by 7 publications

References 38 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

Thermohydraulic Efficiency of a Solar Air Heater in the Presence of Graded Aluminium Wire Mesh—A Combined Experimental–Numerical Study

Thermal Performance Factor of Impinging Jet‐Angled Corrugated Solar Air Heaters

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