Numerical Research On Heat Transfer And Flow Resistance Performance Of Rib Conical Tube

Enhanced heat transfer technology has been developing in the mid-20th century.The technology can improve the overall performance of the heat exchanger andreduce the costs. Theories of heat transfer enhancement techniques are mainly thefield synergy principle and the longitudinal vortex technology. Currently the shell andtube heat exchangers occupy37%of the market, It is of great significance to developa new type of high efficient heat exchange tube through the enhanced heat transfertechnology. By applying the longitudinal vortex enhanced heat transfer technology, anew kind of enhanced heat transfer tube—rib conical tube is developed and thesoftware Fluent is applied to the numerical research of the flow and heat transferperformance of the rib conical heat exchange tube.In this paper, I conducted a number of simulations on the performance of theflow and heat transfer along the rib tubes arranged in the sequential order andarranged in the staggered order within the range of Re from4000to40000. Thecalculation results show that:1) When Reynolds number is low the comprehensiveperformance of the sequential arrangement rib conical tube increases with theincreasing of the depth and width. The comprehensive performance is inverselyproportional to the increase of the depth and width in the high Reynolds number. Thecomprehensive performance of the tube as P=14is better than others in low Reynoldsnumber. But with the increase of Reynolds number, the gap of the comprehensiveperformance of the tubes between P=14and P=18is reducing. The comprehensiveperformance difference between them is very small when Reynolds number is greaterthan or equal to25000. Through the comprehensive analysis this paper concludes thatthe optimal structure parameters are: e=1.2，a=6，p=14（Re=4000），e=0.8，a=4，p=14（Re=20000）.2) When Reynolds number is low the comprehensive performanceof the stagger arrangement rib conical tube increases with the increasing of the depth,the width and the lead. The comprehensive performance decreases with the increasing of the depth, the width and the lead in high Reynolds number. Through thecomprehensive analysis this paper concludes that the optimal structure parameters are:e=1.2，a=6，p=10（Re=4000），e=0.8，a=4，p=18（Re=20000）。...