Based on numerical simulation,the dynamic characteristics of double localized traveling wave(DLTW)convection in a cavity with separation ratio ψ=-0.4 and an aspect ratio Γ=40 are studied.The results show that convective roll is generated at the two end wall,propagates to the center and disap-pears at a certain location.The traveling wave convection region near the two ends of the rectangular cavity coexists with the conduction region without convection in the middle,forming a DLTW convection.Trave-ling waves propagate from both ends of the cavity to the middle of the DLTW convection.Temperature and vertical velocity distributions in the midheight of the cavity are harmonic structures with smooth wave-forms.Concentration distribution is a platform structure.With the development of time,the maximum verti-cal velocity stabilizes at a certain value and changes periodically.The Nusselt number of the lower wall is basically stable at a certain value.The maximum vertical velocity and Nusselt number on the lower wall and the time for them to reach stability increase with the increase of reduced Rayleigh number.DLTW con-vection is stable in the range of reduced Rayleigh number re { 1.52,1.57].The length of convective zone of DLTW increases with the increase of reduced Rayleigh number.The fitting formula for the length of con-vective zone of DLTW varying with the reduced Rayleigh number is given.
double localized traveling wave(DLTW)convectionlength of convective zonemaximum ver-tical velocityNusselt number
维普
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