Numerical Analysis of Heat Transfer Characteristics of Vortex Generator Structure based on Orthogonal Test
In order to further enhance the heat transfer efficiency of the shell side of a shell-and-tube heat exchanger,an innovative biomimetic beak-shaped vortex generator(BSVG)was designed and posi-tioned on the inner surface of the ribbed shell.Utilizing ANSYS FLUENT software in conjunction with Taguchi orthogonal experimental design,the heat transfer characteristics of BSVG in the rectangular chan-nel were simulated.The contribution rate and optimal structural combination of five structural parame-ters,namely longitudinal height,oblique angle,angle of attack,inlet distance and flow spacing,to the enhancement of heat transfer and comprehensive thermal performance were analyzed.The dimensions of the rectangular channel model were 1 600 mm in length,240 mm in width and 40 mm in height.Air fluid entered the channel at a velocity of 1.491 m/s to 3.195 m/s and a temperature of 286.86 K.The con-stant temperature heat transfer surface at the bottom of the channel was at 337.048 K.The results show that longitudinal height has the highest contribution rate to the enhancement of heat transfer characteris-tics,accounting for 47.44％of the total ratio.The heat transfer factor of the optimal combination of BSVG is 185.71％higher than that of the empty rectangular channel;angle of attack has the highest con-tribution rate to the comprehensive thermal performance,accounting for 31.35％of the total ratio.The optimal combination obtained through Taguchi orthogonal experimental analysis improves the comprehen-sive thermal performance of the channel by 47.82％compared with that of the empty channel.
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