摘要
为了弄清管内流体旋流强化传热的物理机制,建立了三维几何模型,数值计算采用标准k-ε两方程湍流模型,用SIMPLE算法求解速度和压力的耦合关系,流道的固体边界实施壁面函数法。模拟结果表明,旋转流动使流体产生较大的切向流速分量,加强了边界层流体和主流流体的扰动和掺混,提高了流场和温度场的协同性,因而旋流使传热过程得到强化。旋流器安置于管道近壁处更有益于减薄流体边界层,并提高流道内流体的对流换热强度。
A 3D geometrical model has been established to understand clearly the physical mechanism of heat transfer enhancement of spiral flow inside a tube. The standard k-ε turbulent mrode with two equations is applied in numerical simulation, and the coupling relation of the velocity and the pressure is solved with SIMPLE arithmetic. The method of wall function is used at the solid boundary of the duct. The simulation results show that the swirl flow of fluid causes the biggish tangent velocity component, and strengthens the disturbances of the fluid in the boundary layer and the main flow, and enhances the synergy degree between the flow field and temperature field,so the swirl flow enhances convective heat trarsfer. It is beneficial to reduce the thickness of the liquid boundary layer and-augment the intensity of convective heat transfer of the fluid for the swifter installed at the adjacent wall of the tube.
出处
《冶金能源》
北大核心
2006年第1期18-20,共3页
Energy For Metallurgical Industry
基金
郑州大学"十五""211工程"重点建设学科:能源科学与技术资助项目
关键词
旋转流动
对流换热
场协同
数值模拟
swirl flow convective heat transfer field synergy numerical simulation
