زهرا ضرغامی دهاقانی

In this study, the results of a direct numerical simulation of turbulent drag reduction in a channel flow by hydrophobic coating at a nominal shear Reynolds number of Reτ = 180 are reported. Slip condition is imposed on the lower wall whereas the upper wall has no-slip condition. For this purpose, the use is made of a numerical simulation of three-dimensional, time-dependent Navier-Stokes equations for the incompressible flow of a Newtonian fluid. Finally, statistical quantities of turbulent flow (specifically the mean velocity profile, the root-mean-square of velocity fluctuations in different directions and the Reynolds shear stress are shown and discussed. The results confirm that by increasing the amount of slip on the lower wall, the bulk velocity passing through the channel increases. Also, the variation of root-mean-square of velocity fluctuations shows a similar behavior in the vicinity of the upper wall. But, their general trend is different in the proximity of the lower wall. Moreover, a change in the shape of the Reynolds shear stress profile from a minimum close to the lower wall towards a maximum close to the upper wall is observed.

In the present study, a bubbling fluidized bed was constructed. Three kinds of rotating distributors with hexagonal, blade, and swirling configurations of holes have been studied. The analysis of the experimental data showed that rotational speed and input air velocity are the key parameters that influence the fluidization quality and its minimum velocity. Through the comparison of different configurations of rotating distributors in bubbling fluidized bed, it was observed that the blade configuration of holes has the best operation in terms of fluidization quality.