Heat transfer mechanism in vibrational turbulent Rayleigh–Bénard convection with rough plates

Abstract

The joint effect of rectangular-type roughness and horizontal vibration on two-dimensional (2D) turbulent Rayleigh–Bénard 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 ≤ ω* ≤ 1000 and the range of dimensionless roughness height 0 ≤ h* ≤ 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.

Keywords:

• Heat transfer
• Rayleigh–Bénard convection
• roughness
• vibration

Disclosure statement

There are no relevant financial or non-financial competing interests to report.

Additional information

Funding

This work was supported by the National Natural Science Foundation of China (U22A20589, U2006221), Natural Science Foundation of Zhejiang Province (LGG21E060004, LZY22E060005) Natural Science Foundation Key Projects of Zhejiang Province (LZ22E060002) and Key Research and Development Program of Zhejiang Province (2022C01159).