Study on gas-particle heat transfer in oscillating flows

Abstract

A numerical study of the gas-particle cluster interphase heat transfer in oscillating flows is conducted by using the one-dimensional Eulerian-Eulerian model. The effects of flow oscillation on the two-phase flow, particle concentration and as well the interphase heat transfer rate are investigated. The results show that the heat transfer between the gas and particle clusters can lead to the increases of the average particle concentration and the corresponding oscillation amplitude, but the decrease of the oscillation wavelength, which are closely related to the interphase heat transfer during the particle velocity relaxation process. Convective particle clustering is the primary cause of the oscillation of the two-phase mixture equilibrium temperature. Particle initial velocity and gas inlet velocity have great influences on the particle concentration and temperature. Increases in the gas inlet mean velocity and oscillation frequency are beneficial for the reduction in particle and gas temperature oscillation amplitudes. Particle diameter has an insignificant influence on the averaged values of the two-phase equilibrium mixture parameters but a noted impact on the oscillation amplitude of particle concentration. The increase in particle diameter is helpful for the reduction of the oscillation amplitude of the two-phase mixture equilibrium temperature.