In order to investigate the effect of adding pit structures on the average heat transfer characteristics,resistance char-acteristics,and related comprehensive performance of electric heating elements,this article conducted numerical simulation research on the heat transfer and flow characteristics of semi elliptical finned electric heating elements with pit structures.A comparative analysis was conducted on smooth surface electric heating elements with the same electric heating power as the benchmark.The research results indicate that the concave structure not only increases the heat transfer area of the electric heating element,but also to some extent damages the thermal and flow boundary layers of the air crossing the electric heating element,causing the separation point of the boundary layer to move backward,thereby strengthening heat transfer.At Re=2 000,the optimal combination of pit parameters for the electric heating element is d=0.8 mm and L=12 mm.Its Nu value increases by about 3.82％compared to the Nu value of the electric heating element with a smooth surface,and the overall heat transfer performance increases by about 3.6％.
pit structureelectric heating elementheat transfer characteristicsflow characteristic
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