关键词: asynchronous iterative method, relaxed method, linear systems of equations, Lagrangian tracking approach, direct numerical simulation (DNS), heat transfer, particle-laden turbulent flow

Abstract:

The effect of inertial particles with different specific heat on heat transfer in particle-laden turbulent channel flows is studied using the direct numerical simulation (DNS) and the Lagrangian particle tracking method. The simulation uses a two-way coupling model to consider the momentum and thermal interactions between the particles and turbulence. The study shows that the temperature fields display differences between the particle-laden flow with different specific heat particles and the particle-free flow, indicating that the particle specific heat is an important factor that affects the heat transfer process in a particle-laden flow. It is found that the heat transfer capacity of the particle-laden flow gradually increases with the increase of the particle specific heat. This is due to the positive contribution of the particle increase to the heat transfer. In addition, the Nusselt number of a particle-laden flow is compared with that of a particle-free flow. It is found that particles with a large specific heat strengthen heat transfer of turbulent flow, while those with small specific heat weaken heat transfer of turbulent flow.

Key words: asynchronous iterative method, relaxed method, linear systems of equations, direct numerical simulation (DNS), particle-laden turbulent flow, Lagrangian tracking approach, heat transfer