Browsing by Author "Menni, Younes"

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    Developing Heat Transfer In A Solar Air Channel With Arc-shaped Baffles
    (Oum-El-Bouaghi University, 2018) Menni, Younes; Azzi, Ahmed; Chamkha, Ali J.
    The current study illustrates a computational fluid dynamic analysis of 2D steady-state turbulent forced-convection flow and friction loss characteristics through a constant temperature-surfaced rectangular cross section channel fitted with two staggered, upper and lower wall-attached, arc-shaped, solid-type obstacles. The aspect ratio of channel width-to-height, channel length-to-aeraulic diameter, baffle spacing-to-channel height ratio, and blockage ratio of baffle height-to-channel height are fixed at W/H = 1.321, L/Dh = 3.317, Pi/H = 0.972, and h/H = 0.547, respectively. The numerical runs were carried out for various attacks of arc-baffle angle values, θ = 30°, 45°, 60°, and 75°, at constant surface temperature condition along the upper and lower channel walls. In particular, fields of mean velocity, profiles of axial velocity, local and average distributions of Nusselt numbers, and skin friction loss were obtained for a constant value of the flow Reynolds number. The numerical result analysis showed that the value of arc-baffle angle of attack of flow plays an important role in fluid flow as well as thermal heat behaviors and also impacts skin friction loss.
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    Effect Of Fin Spacing On Turbulent Heat Transfer In A Channel With Cascaded Rectangular-triangular Fins
    (Oum-El-Bouaghi University, 2017) Menni, Younes; Azzi, Ahmed; Zidani, Chafika; Benyoucef, Boumédiène
    Through this work, we performed a two-dimensional analysis of a constant property fluid (air) flowing into a rectangular cross section channel with staggered cascaded rectangular-triangular shaped fins (CRTFs). The governing flow equations, i.e., continuity, momentum, turbulence, and energy equations, employed to simulate the incompressible steady fluid and heat transfer in the whole domain investigated, were solved by the finite volumes approach, in two dimensions, employing the Computational Fluid Dynamics, Commercial Software FLUENT with the low-Reynolds-numberk-ε model to describe the turbulence phenomenon. The simulations were conducted for the channel of aspect ratio, AR = 1.32 and aeraulic diameter, Dh = 0.167 m with five different finspacing, (S = Pi/2, 3Pi/4, Pi, 5Pi/4 and 3Pi/2) and five various Reynolds number values, (Re = 10,000, 15,000, 20,000, 25,000, and 30,000) while the CRTF height-to-channel height blockage ratio, BR is set to 0.55 and kept constant. The velocity and pressure fields, skin friction loss, and local and average Nusselt numbers were obtained at constant surface temperature condition along the upper and lower surfaces of the channel.The analysis of the numerical results proved that both the Reynolds number and the CRTF separation distance had an effect on the dynamic and thermal behavior of air in the given computational domain. The Nusselt numbers and skin friction coefficients increase with the rise in the Reynolds number but decrease with the increase in the fin spacing. By comparing with those implemented in practice, our numerical results are very agreeable. This analysis can be applied in improving the thermal efficiency of solar air collectors as well as heat exchangers.