Development of heat transfer correlation for novel rotating packed bed using air water system
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Date
2022-09
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G. B. Pant University of Agriculture and Technology, Pantnagar
Abstract
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 thermal behaviour of RPB for air-water system. The study presents thermal analysis of 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 heat transfer rate at different operating parameters such as air flow rate (0.0076 to 0.0202 kg/s), water flow rate (0.033 to 0.133 kg/s), water inlet temperature (35 to 45°C) and rotor speed (400 to 2000 rpm). In addition, heat transfer correlation has been also purposed by considering the effect of geometric parameters, operating parameters, structure of the packing, and nature of the packing. Results shows that heat transfer rate increases with air flow rate and water flow rate. Heat transfer rate for RPB increased with rotational speed of packing from 400 RPM to 1200 RPM and then started decreasing up till 2000 RPM. It also showed increment with water inlet temperature and was found to be maximum at 45°C, at water flow rate of 0.133 kg/s, and air flow rate of 0.0202 kg/s and at rotational speed of 1200 RPM. Evaporative heat transfer was found to be dominant mode of heat transfer and found to constitute 64 to 79% of total heat transfer. The results for overall heat transfer rate were compared with previous study and estimated heat transfer error was found to be ± 10%.