The present study is concerned with two-sided lid-driven incompressible flow
in rectangular, deep cavities applying lattice Boltzmann method. After
validating the code for the square cavity, solutions for cavities with an
aspect ratio 1.5 and 4 were obtained for the Reynolds numbers of 100, 400,
1000 and 3200. The influence of the Reynolds number and aspect ratio on the
flow pattern and on the characteristics of vortices inside the cavity was
studied. Symmetric flow pattern was obtained for all investigated cases. The
middle of the cavity is mostly influenced by the increase in the aspect
ratio. Critical aspect ratio, at which the birth of a primary vortex in the
middle of the cavity takes place, was determined to be between 2.7 and 2.725.
[Projekat Ministarstva nauke Republike Srbije, br. 172025]
Experimental studies on the effect of geometrical characteristics (restriction orifice free area and sparger configuration) on the riser gas holdup of an external-loop airlift reactor have been conducted in this paper. The impact of the addition of non-coalescing media, such as n-butanol, was also investigated. In general, the decrease in the restriction orifice free area led to a substantial increase (up to 90%) in the riser gas holdup. The addition of n-butanol effected gas holdup to a lesser extent, as it increased the gas holdup in the range of 4-15%, depending on the restriction orifice free area. On the other hand, the impact of the sparger type was observed only at lower gas velocities, for which the sinter plate increased the gas holdup up to 20% in comparison to the single orifice. The paper also presents an empirical correlation for the estimation of the riser gas holdup with an average relative error of 7%. Finally, a neural network model with an average relative error of 2.4% was proposed.
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