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ThesisItem Open Access Experimental studies on pressure drop characteristics in a novel rotating packed bed(G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2020-11) Alam, Parvez; Murthy, D.S.Rotating packed bed (RPB), which is a multiphase contactor operating in centrifugal field 100-1000 times of the gravitational field, works on the principle of “Hi-Gee”. In RPB, centrifugal field governs the liquid flow, which resulted in miniaturization of conventional columns in chemical industries which have only gravity as driving force. RPB has received considerable attention for mass transfer intensification and it has been well established in chemical industries due to its multi advantages over conventional columns. The analogy between the heat and mass transfer suggests that this modern concept can also play a vital role in heat transfer intensification and size reduction in thermal industries by replacing conventional cooling towers. Present study was taken to explore the pressure drop behavior of RPB for air-water system. The study presents experimental analysis on the counter-current flow for air-water system in a RPB with wire-mesh packing. The primary focus was on the performance of the RPB via thorough assimilation of air side pressure drop at different operating parameters such as air flow rate (0 to 66.93 m3/h), water flow rate (0 to 10 L/min) and rotor speed (0 to 2000 rpm). In addition, air side pressure drop correlation for dry bed has been also purposed by considering the effect of geometric parameters, operating parameters, structure of the packing, and nature of the packing surface. Results show that the air side pressure drop was increasing with air flow rate and rotor speed for dry bed. When water was introduced inside the packed bed then three different flow patterns (flooding, droplet, and flying droplet flow) were observed at different rotor speed. In flooding flow, air side pressure drop in wet bed was more than dry bed and it was increasing with water flow rate. In flying droplet flow, air side pressure drop in wet bed was less than that of dry bed and it was decreasing with water flow rate. In droplet flow, air side pressure drop was less than that of dry bed at low water flow rate (1 to 4 L/min) and higher than that of the dry bed at higher water flow rate (6 to 10 L/min). The results of air side pressure drop correlation were compared with the different experimental results obtained by different investigators and the estimated pressure drop error was within ± 16 %.
