Forced convection from a circular cylinder in pulsating flow with and without the presence of porous media

Al-Sumaily, Gazy F.; Thompson, Mark C.

doi:10.1016/j.ijheatmasstransfer.2013.01.067

Cited by 56 publications

(20 citation statements)

References 28 publications

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“…The flow stabilizes afterward as the aluminum foam creates a high damping effect on the flow. This phenomenon was also observed by AlSumaily and Thompson [40]. We can also see a temperature increase on the heater in the flow direction axis and the growth of thermal and hydrodynamic boundary layers.…”

Section: Local Nusselt Number Distributions and Thermal Development Osupporting

confidence: 87%

Electronic cooling using water flow in aluminum metal foam heat sink: Experimental and numerical approach

Bayomy

Saghir

Yousefi

2016

International Journal of Thermal Sciences

127

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Section: Local Nusselt Number Distributions and Thermal Development Osupporting

confidence: 87%

Electronic cooling using water flow in aluminum metal foam heat sink: Experimental and numerical approach

Bayomy

Saghir

Yousefi

2016

International Journal of Thermal Sciences

127

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“…Thompson [34]. The computational domain is 23D×4D, where D is the cylinder diameter, and the center of the cylinder is positioned at (8D, 2D).…”

Section: Pulsatile Inflow Past a Stationary Cylindermentioning

confidence: 99%

“…The computational domain is 23D×4D, where D is the cylinder diameter, and the center of the cylinder is positioned at (8D, 2D). A fully-developed dimensionless pulsating flow velocity u(t) is applied at the inlet of the channel and is expressed as follows [34],…”

Section: Pulsatile Inflow Past a Stationary Cylindermentioning

confidence: 99%

The response of an elastic splitter plate attached to a cylinder to laminar pulsatile flow

Kundu

Soti

Bhardwaj

et al. 2017

Journal of Fluids and Structures

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The flow-induced deformation of a thin, elastic splitter plate attached to the rear of a circular cylinder and subjected to laminar pulsatile inflow is investigated. The cylinder and elastic splitter plate are contained within a narrow channel and the Reynolds number is mostly restricted to Re = 100, primarily covering the two-dimensional flow regime. An in-house fluidstructure interaction code is employed for simulations, which couples a sharp-interface immersed boundary method for the fluid dynamics with a finite-element method to treat the structural dynamics. The structural solver is implicitly (two-way) coupled with the flow solver using a partitioned approach. This implicit coupling ensures numerical stability at low structure-fluid density ratios. A power spectrum analysis of the time-varying plate displacement shows that the plate oscillates at more than a single frequency for pulsatile inflow, compared to a single frequency observed for steady inflow. The multiple frequencies obtained for the former case can be explained by beating between the applied and plate oscillatory signals. The plate attains a self-sustained time-periodic oscillation with a plateau amplitude in the case of steady flow, while the superimposition of pulsatile inflow with induced plate oscillation affects the plateau amplitude. Lock-in of the plate oscillation with the pulsatile inflow occurs at a forcing frequency that is twice of the plate natural frequency in a particular mode and this mode depends on the plate length. The plate displacement as well as pressure drag increases at the lock-in condition. The percentage change in the maximum plate 2 displacement, and skin-friction and pressure drag coefficients on the plate, due to pulsatile inflow is quantified. The non-linear dynamics of the plate and its coupling with the pulsatile flow are briefly discussed.

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“…The results reveal some wakes and eddies in front of each heat sink caused by the entrance effect. The flow stabilizes once it enters the channels as the aluminum foam creates a high damping effect . We can also see a temperature increase on the heater in the flow direction axis and the growth of thermal and hydrodynamic boundary layers.…”

Section: Resultsmentioning

confidence: 89%

Thermal performance of finned aluminum heat sink filled with ERG aluminum foam: Experimental and numerical approach

Bayomy

Saghir

2020

Int J Energy Res

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Summary The rapid improvements in electronic devices have led to a high demand for effective cooling techniques. The purpose of this study was to investigate the heat transfer characteristics and performance of different aluminum heat sinks filled with aluminum foam for an Intel core i7 processor. The aluminum foam heat sinks were subjected to water flow covering the non‐Darcy flow regime (300‐600 Reynolds numbers). The bottom side of the heat sinks was heated with a heat flux between 8.5 and 13.8 W/cm2. Three different heat sinks were examined in this study. Models A, B, and C contained two, three and four channels, respectively. Each channel gap was filled with ERG aluminum foam. The distributions of the local surface temperature and the local Nusselt number were measured for each heat sink design. The experimental data were compared with the numerical results. The average Nusselt number was obtained for the range of Reynolds numbers, and an empirical correlation of the average Nusselt number as a function of the Reynolds number was derived for each heat sink. The pressure drop across the characteristics of each heat sink design was measured. The thermal performance of each aluminum foam heat sink was evaluated based on the average Nusselt number and the required pumping power. The experimental results revealed that model B achieved the highest average Nusselt number compared with models A and C. However, model C had the highest surface to volume ratio; the thermal boundary layers, which are formed on adjacent fin surfaces inside the aluminum foam, interface with each other causing a reduction in the overall heat transfer. The numerical results were in good agreement with experimental data of local Nusselt number and local temperature with maximum relative errors of 2% and 1%, respectively.

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Forced convection from a circular cylinder in pulsating flow with and without the presence of porous media

Cited by 56 publications

References 28 publications

Electronic cooling using water flow in aluminum metal foam heat sink: Experimental and numerical approach

Electronic cooling using water flow in aluminum metal foam heat sink: Experimental and numerical approach

The response of an elastic splitter plate attached to a cylinder to laminar pulsatile flow

Thermal performance of finned aluminum heat sink filled with ERG aluminum foam: Experimental and numerical approach

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