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CFD simulation of heat transfer and fluid flow within metallic foam in forced convection environment

Boulahrouz S., Avenas Y., Chehhat A.

Mechanics and Mechanical Engineering

2017

Vol. 21, nr 3

611--635

In the present study, a CFD simulation of forced convection in a rectangular block of aluminum foam is investigated. A two energy equations model with the Brinkman-Forchheimer extended Darcy model is considered in the CFD investigation. The governing equations are solved using COMSOL, a commercial multiphysics finite-element PDE solver. Three types of aluminum foam 10-, 20-, 40- pore per inch with different porosity are studied. A parametric study for the range of Reynolds number Re = 250-2000 and the imposed heat flux qw = 0:8−1:6 (W/cm2) is carried out to examine the thermal and the fluid flow behaviors of the aluminum foams. It is found that the plug flow conditions are prevalence for the aluminum foams. The 40-pore per inch aluminum foam has a better heat transfer performance with a larger pressure drop, followed by the 20-, and then by the 10- pore per inch. The validation of the simulation results is made against experimental data from the literature and showed a perfect agreement.

Calculation and analysis of local magnetic forces in ferrofluids

Petit M., Kedous-Lebouc A., Avenas Y., Tawk M., Artega E.

Przegląd Elektrotechniczny

2011

R. 87, nr 9b

115-119

This paper presents a non-exhaustive overview of magnetic force formulations mainly used in ferrohydrodynamics. All of these formulations give the same global result but the local force density is different from each other. We propose to compare these formulations in order to highlight which one is the best representation of the local force density. In order to find a reference of local force distribution, computations have been carried out using the virtual work method on particles surrounded by thin layers of air. The whole particles and air have been homogenized to create a linear uniform material. Finally, force distributions have been computed and have been compared to the reference calculated by virtual work method.

W artykule przedstawiono przegląd metod określania siły magnetycznej w ferrofluidach. W różnych metodach otrzymuje się różne lokalne wartości siły. W celu weryfikacji metod prze[prowadzono obliczenia numeryczne w których modelowano cząstki otoczone cienką warstwą powietrza.