3D Numerical Simulation of Fluid Flow and Heat Transfer for Asymmetric Spiral-Gear Inserts in a Tube
For solving cleaning fouling online for shell-and-tube heat exchanger, an asymmetric spiralgear cleaning technology is presented. The RNG k-ε turbulent model is used to simulate the fluid flow and heat transfer of the tube with the spiral-gear. Its velocity and turbulent intensity field, convection heat transfer characteristic and resistance property are analyzed. Numerical simulation results shows that radial velocity is larger in the annular area near the tube wall than that in the smooth tube. Tangential velocity in the diameter area corresponding to the width of spiral-gear insertion increases with radius, but it decreases with radius in the annular clearance between the insert and the tube wall. However, fluid tangential motion of the smooth tube is only stochastic, and its tangential velocity is lower several orders of magnitude than that for the tube with the insertions. The average surface heat transfer coefficient of the spiral-gear-inserted tube wall is increased nearly 88％ than that from the smooth tube wall. In addition, the pressure drop caused by spiral-gear inserts is in the permissible range of engineering application. The inserts is applicable to the heat exchangers at a flow rate lower than 0.8 m·s-1.
Heat transfer enhancement Asymmetric spiral-gear inserts RNG k-ε turbulent model Numerical simulation
Peng Deqi Wang Weiqiang Yu Tianlan Wei Biao Zhou Yu Tang Jiashi
School of Mechanical Engineering, Xiangtan University, Hunan province, China
国际会议
合肥
英文
1686-1690
2011-09-23（万方平台首次上网日期，不代表论文的发表时间）