Evaluation of flow and heat transfer performance of spiral coil jacket with different cross sections

Abstract

The flow and heat transfer performance of the spiral coil jacket for a reactor with five different cross-section shapes was evaluated. The comprehensive performance of five jacket models was analyzed through PEC and JF evaluation factors, which provided a basis for jacket design in industrial application. The results showed that at certain Reynolds number, the Nusselt number of the arcuate cross-section jacket was lower than that of the half-pipe jacket, but the flow resistance coefficient was lower and the resistance loss was smaller. The secondary flow generated by the half pipe jacket made the temperature gradient in the corner of the cross section far less than that of the center, thus affecting the heat transfer of the jacket. The vortex structure analysis showed that the edges and corners of the inner wall of the jacket were prone to generate vortex structure. The comprehensive evaluation factors of PEC and JF showed that the arcuate jacket of 140° had the best comprehensive performance.