FDMP-Vol. 13, No. 3, 2017

Open Access

ARTICLE

A Note on the Transient Electrohydrodynamics of a Liquid Drop
Asghar Esmaeeli¹, Ali Behjatian¹
FDMP-Fluid Dynamics & Materials Processing, Vol.13, No.3, pp. 143-153, 2017, DOI:10.3970/fdmp.2017.013.143
Abstract The evolution of the flow field in and around a liquid drop in a unifor-m electric field for fluid systems corresponding to region (II) of the circulation-deformation map is fundamentally different than that for the rest of the map and has not been explored before. This is examined here and justified mathematical-ly. Furthermore a methodology is developed to predict the flow pattern, which is likely to be helpful in predicting the evolution of the flow field in more complex circumstances. More >

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ARTICLE

Mixed Convection of a Nanofluid in a Vertical Anisotropic Porous Channel with Heated/Cooled Walls
S. Slama¹, H. Kahalerras¹, B. Fersadou¹
FDMP-Fluid Dynamics & Materials Processing, Vol.13, No.3, pp. 155-172, 2017, DOI:10.3970/fdmp.2017.013.155
Abstract A numerical study is conducted to investigate the problem of mixed convection of a nanofluid in a vertical porous channel with one wall heated and the other cooled. The Darcy-Brinkman-Forchheimer model is used to describe the flow in the porous medium, considered as anisotropic in thermal conductivity, and the two-phase approach is adopted to simulate the motion of the nanofluid. The governing equations with the associated boundary conditions are solved by the finite volume method. The parametric study is focused on the variation of the Richardson number Ri, the heat fluxes ratio R_q, the Darcy number… More >

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ARTICLE

Computational Investigation of Droplets Behaviour inside Passive Microfluidic Oscillator
Tawfiq Chekifi^{1, *}, Brahim Dennai², Rachid Khelfaoui²
FDMP-Fluid Dynamics & Materials Processing, Vol.13, No.3, pp. 173-187, 2017, DOI:10.3970/fdmp.2017.013.173
Abstract Recently, modeling immiscible fluids such as oil and water have been a classical research topic. Droplet-based microfluidics presents a unique platform for mixing, reaction, separation, dispersion of drops and many other functions. In this paper, we suggest a numerical CFD study of microfluidic oscillator with two different lengths of feedback loop. In order to produce simultaneous droplets of gasoil on water, a typical geometry that includes double T-junction is connected to the fluidic oscillator. Droplets production is computed by volume-of-fluid method (VOF). Flow oscillations of droplets were triggered by the Coanda effect of jet flow. More >

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Mixed Convection of Nanofluids inside a Lid-Driven Cavity Heated by a Central Square Heat Source
Fatima-zohra Bensouici^{1, *}, Saadoun Boudebous²
FDMP-Fluid Dynamics & Materials Processing, Vol.13, No.3, pp. 189-212, 2017, DOI:10.3970/fdmp.2017.013.189
Abstract A numerical work has been performed to analyze the laminar mixed convection of nanofluids confined in a lid driven square enclosure with a central square and isotherm heat source. All the walls are cooled at constant temperature, and the top wall slides rightward at constant velocity. The simulations considered four types of nanofluids (Cu, Ag, Al₂O₃ and TiO₂)-Water. The governing equations were solved using finite volume approach by the SIMPLER algorithm. Comparisons with previously published work are performed and found to be in good agreement. The influence of pertinent parameters such as Richardson number, size of… More >

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