Mixed convection in an inclined channel with heated porous blocks

Guerroudj, N.; Kahalerras, H.

doi:10.1108/09615531211255743

Cited by 17 publications

(11 citation statements)

References 45 publications

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“…The paper provides comprehensive research results of thermal characteristics in metal foams. Guerroudj and Kahalerras (2012) numerically studied the effects of mixed convection in an inclined channel filled with heated porous blocks. They reported that the inclination angle of the channel plays an important role in the calculation of flow and heat transfer, hence, obtained a maximum Nusselt number at a channel angle of +90°.…”

Section: Introductionmentioning

confidence: 99%

Effect of thickness and thermal conductivity of metal foams filled in a vertical channel – a numerical study

Kotresha

Gnanasekaran

2019

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Purpose This paper aims to discuss about the two-dimensional numerical simulations of fluid flow and heat transfer through high thermal conductivity metal foams filled in a vertical channel using the commercial software ANSYS FLUENT. Design/methodology/approach The Darcy Extended Forchheirmer model is considered for the metal foam region to evaluate the flow characteristics and the local thermal non-equilibrium heat transfer model is considered for the heat transfer analysis; thus the resulting problem becomes conjugate heat transfer. Findings Results obtained based on the present simulations are validated with the experimental results available in literature and the agreement was found to be good. Parametric studies reveal that the Nusselt number increases in the presence of porous medium with increasing thickness but the effect because of the change in thermal conductivity was found to be insignificant. The results of heat transfer for the metal foams filled in the vertical channel are compared with the clear channel in terms of Colburn j factor and performance factor. Practical implications This paper serves as the current relevance in electronic cooling so as to open up more parametric and optimization studies to develop new class of materials for the enhancement of heat transfer. Originality/value The novelty of the present study is to quantify the effect of metal foam thermal conductivity and thickness on the performance of heat transfer and hydrodynamics of the vertical channel for an inlet velocity range of 0.03-3 m/s.

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Section: Introductionmentioning

confidence: 99%

Effect of thickness and thermal conductivity of metal foams filled in a vertical channel – a numerical study

Kotresha

Gnanasekaran

2019

HFF

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“…Because of an interesting thermal performance, several studies have been conducted on the thermal behavior of metal foam such as the porous block's shape and height (Guerroudj and Kahalerras, 2012), hole's density (Bhattacharya and Mahajan, 2002), air flow velocity (Byon, 2015) and particle deposition (Odabaee et al, 2013). Although most of the studies are based on active heat sinks that dissipates heat by forced convection, but air cooling heat sinks by buoyancy-induced convection are favorable from an economic point of view.…”

Section: Introductionmentioning

confidence: 99%

Experimental and artificial neural network investigation on the effect of inclination angle on the interface temperature of CPU/metal foam heat sink

Rashidi

Paknezhad

Yousefi

2018

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Purpose This study aims to clarify the relationship between inclination angle of hot surface of CPU and its temperature in absence and presence of aluminum foam as a cooling system. It proposes application of the artificial neural [multi-layer perceptron (MLP) and radial basis function] networks and adaptive neuron-fuzzy inference system (ANFIS) to predict interface temperature of central processing unit (CPU)/metal foam heat sink. Design/methodology/approach To provide a consistent set of data, the surface of an aluminum cone with and without installing Duocel aluminum foam was heated in a natural convection using an electrical resistor. The hot surface temperature was measured using five K-type thermocouples (±0.1°C). To develop the predictive models, ambient temperature, input power and inclination angle are taken as input which varied from 23°C to 32°C, 4 to 20 W and 0° to 90°, respectively. The hot surface temperature is taken as the output. Findings The results show that in the presence of foam, the hot surface temperature was less sensitive to the variations of angle, and the maximum enhancement of the heat transfer coefficient was 23 per cent at the vertical position. Both MLP network and ANFIS are comparable, but the values predicted by MLP network are in more conformity with the measured values. Originality/value The effect of metal foam on the inclination angle/hot surface temperature dependence is identified. The optimum angle is clarified. The applicability of the MLP networks to predict interface temperature of CPU/heat sink is approved.

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“…The study reveals that for large values of mixed convection parameter, the formation of boundary layer structures on the plate was observed to occur. Guerroudj and Kahalerras (2012) investigated mixed convection in an inclined channel with heated porous blocks, and their results reveal that the inclination angle of the channel can alter substantially the fluid flow and the heat transfer mechanisms, especially at high Richardson and Darcy numbers. The maximum and minimum global Nusselt numbers (Nu) are reached for α = +90 • and α = −90 • .…”

Section: Introductionmentioning

confidence: 99%

Mixed Convection in an Inclined Channel Filled with Porous Material Having Time-Periodic Boundary Conditions: Steady-Periodic Regime

2015

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This paper reports an investigation of the hydrodynamic and thermal behaviour in a steady-periodic regime of a fully developed laminar mixed convection flow in an inclined channel filled with porous material. One of the channel walls is kept at a constant temperature, while the other is heated sinusoidally. The flow formation inside the porous media is modelled using Darcy-Brinkman model. The resulting governing dimensionless momentum and energy equations are separated into steady and periodic parts and solved analytically by the method of undetermined coefficients. In order to see the effect of the governing parameters on the thermal and hydrodynamic behaviour of the fluid flow, the results are depicted pictorially. These are seen to depend strongly on the dimensionless frequency of the periodic heating, Darcy number and the Prandtl number of the working fluid. The result is also seen to be in strong agreement with the existing analytical work, when the Darcy number is large. For sufficiently high Prandtl number, it is observed that the amplitude of the friction factor oscillation is maximised at a resonance frequency at the wall where there is periodic heating; also increasing Darcy number (Da) increases the amplitude of the friction factor oscillation, while it reduces the resonance frequency.

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Mixed convection in an inclined channel with heated porous blocks

Cited by 17 publications

References 45 publications

Effect of thickness and thermal conductivity of metal foams filled in a vertical channel – a numerical study

Effect of thickness and thermal conductivity of metal foams filled in a vertical channel – a numerical study

Experimental and artificial neural network investigation on the effect of inclination angle on the interface temperature of CPU/metal foam heat sink

Mixed Convection in an Inclined Channel Filled with Porous Material Having Time-Periodic Boundary Conditions: Steady-Periodic Regime

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