Heat transfer mechanism in vibrational turbulent Rayleigh-Benard convection with rough plates

The joint effect of rectangular-type roughness and horizontal vibration on two-dimensional (2D) turbulent Rayleigh-Benard convection (RBC) is investigated by using the thermal lattice Boltzmann method (LBM) in this article. The present work focuses on the Nusselt number and plume dynamics of the convection in the range of dimensionless vibration frequency 0 & LE; & omega;* & LE; 1000 and the range of dimensionless roughness height 0 & LE; h* & LE; 0.05. The Rayleigh number is 108 and Prandtl number is 4.38. Our numerical results indicate that the relationship between the Nusselt number and roughness height is mostly proportional, and the relationship between the Nusselt number and the vibration frequency is exponential. It is further found that heat transfer enhances by 3.06 times under the joint effect of horizontal vibration and rectangular roughness on turbulent RBC. It provides significant physical insight into the mechanism of cooperative heat transfer enhancement.

Automated summary

The joint effect of rectangular-type roughness and horizontal vibration on two-dimensional turbulent Rayleigh-Benard convection is studied using the thermal lattice Boltzmann method. The Nusselt number and plume dynamics of the convection are the main focus, within the ranges of dimensionless vibration frequency 0≤ω*≤1000 and dimensionless roughness height 0≤h*≤0.05. Numerical results show that the Nusselt number is mostly proportional to the roughness height and exponentially related to the vibration frequency. Furthermore, heat transfer is enhanced by 3.06 times under the joint effect of horizontal vibration and rectangular roughness on turbulent Rayleigh-Benard convection. This provides important insights into the mechanism of cooperative heat transfer enhancement.