Simulation of Heat Transfer Enhancement by Longitudinal Vortex Generators in Dimple Heat Exchangers
We present a D3Q19 lattice Boltzmann method to study the flow and heat transfer in dimple heat exchangers.The strategy is based on the combination of the multi-Relaxation-time(MRT)approach to obtain the velocities and on the Finite Difference Method(FDM)to solve the energy equation.Both the heat transfer and flow resistance are discussed.Furthermore,to enhance the heat transfer with low pressure penalty,a small crescent-shape protrusion was added as a longitudinal vortex generator(LVG).And a grooved LVG was developed to reduce the drop loss caused by the crescent-shape protrusion.The effect of Reynolds number and different surfaces are examined.The streamline contours,isotherms,Nusselt numbers and friction coefficients at various Reynolds numbers are presented.The results show that the thermal performance of the LVG cases is better than that of the dimple cases with similar flow characteristics.Moreover,from the viewpoint of energy saving,LVG cases perform better than the dimple cases.
Multi-relaxation-time Lattice Boltzmann Method (MRT-LBM) Heat Transfer Enhancement Dimple Laminar Flow Vortex Generator
Huihui Xia Guihua Tang Yu Shi Wenquan Tao
MOE Key Laboratory of Thermo-Fluid Science and Engineering,School of Energy and Power Engineering,Xian Jiaotong University,Xian 710049,P.R.China
国际会议
桂林
英文
1-15
2013-07-16（万方平台首次上网日期，不代表论文的发表时间）