Numerical Prediction of Shell and Tube Heat Exchangers Performance with Fold Segmental Baffle
Abstract
Shell and Tube Heat Exchanger (STHE) has been used widely used in industry for energy transferring between two and more fluids. Effectiveness of STHE is enhanced by utilizing baffle on the fluid passage in the shell. In this research, a novel baffle which has specific geometrical shape is investigated. The baffle is built based on segmental baffle which is fold on the edge with variation fold angel 120˚, 135˚, and 150˚. This research is carried out using numerical simulation with ANSYS, and validated using experimental data. This research compares conventional and fold segmental baffles performance on the shell and tube heat exchanger. Research revealed that the 150˚-fold angle has superior performance as indicated by the highest effectiveness (ε) among the fold segmental baffle. For comparison, at a mass flow rate of the fluid in shell of 0.4 kg/s, the effectiveness is obtained at 31.521%; 31.077%, 31.764%, and 31. 928% for conventional segmental baffle, fold angle 120˚, 135˚, and 150˚, respectively. In addition, the pressure drops of the fold segmental have no significant difference with that on the conventional segmental baffle. Comparing between the conventional and fold segmental baffle, it is noted that fold segmental baffle offers better performance, especially fold angle of 135o and 150o. This finding offer prospectus advantage of using fold segmental baffle in shell and tube heat exchanger
Keywords : CFD, effectiveness, heat transfer coefficient, segmental baffle, shell and tube heat exchanger.
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