关键词: 转子, RNG k-&epsilon, 湍流模型, 数值模拟, 换热效率

Abstract:

A three-dimensional fluid flow model for a rotor-inserted tube was presented.The RNG k-ε  turbulent model was used to simulate the fluid flow and heat transfer in the round tube with rotor inserts were determined which had different shapes of cross section.Numerical simulation results show that the fluid flow is a complex three-dimensional helix flow in the rotor-inserted tube.The radial velocity is larger than that in the smooth tube.The tangential velocity in the diameter area of rotor increases with the radius,the tangential motion in the annular area between the rotor and tube wall is obvious,but the tangential velocity decreases with the radius.After cross section of rotor is improved,the flow field of the tube is improved obviously,heat transfer coefficiency inside tube is enhanced and friction factor is also increased.

Key words: rotor;RNG k-ε , turbulent model;numerical simulation;heat transfer coefficiency