Intensification of heat transfer in a turbulent gas-droplet flow with peripheral swirling

The effect of peripheral flow swirling in a cylindrical channel on the local flow structure and heat transfer in a turbulent gas-droplet flow was numerically studied with variations in the initial mass concentration of water droplets in the range M_L1 = 0 – 0.1 and the initial droplet diameter d₁ = 10 – 100 µm. It is shown that adding droplets leads to a significant increase in heat transfer (more than 2.5 times) in comparison with a single-phase swirling flow. The heat transfer patterns in gas-droplet flows with and without swirling are qualitatively similar. The effect of heat transfer intensification due to gas-droplet flow swirling reaches 50 % at M_L1 = 0.1. Initially, with an increase in the droplet size, a significant intensification of heat transfer in the swirling flow occurs. Maximum heat transfer is obtained at d₁ ≈ 50 µm for all swirling intensities of the two-phase flow. Then the value of heat transfer decreases and its dependence on the droplet size becomes more gradual.