Shell-side flow study and structural optimization of a double helical-like flow heat exchanger

Abstract

A double helical-like flow heat exchanger model was built, its shell-side flow state was studied by the CFD method, and the difference in heat transfer performance between it and the torsional flow heat exchanger was compared. From the numerical simulation results, it is found that the heat transfer coefficient and pressure drop are improved by 7.07%-8.93% and 15.50%-18.22% respectively at the same flow rate, and the comprehensive performance expressed as Nu/f1/3 is improved by 21.84%-24.08%. Using the orthogonal test method to optimize the shell-side structure, it is found that the comprehensive performance is influenced by the two factors of spacing/groups and angle of baffles, and the influence of the deflection angle of two adjacent groups of baffles is very small, and the optimal structural combination of comprehensive performance is 30-0-70/11 (the angle of baffles is 30?, the deflection angle of two adjacent groups of baffles is 0?, the spacing between two adjacent sets of baffles is 70 mm, and the number of baffle groups is 11). The reliability and feasibility of the simulation method were verified by experiments.