The Influence of Droplet Dispersity on Droplet Vaporization in the High-Temperature Wet Gas Flow in the Case of Combined Heating

Abstract

The change in the thermal and energy state of the water droplet is defined numerically. The influence of droplet dispersity on the interaction of the transfer processes was evaluated. In influence of the Stefan flow was considered as well. The internal heat transfer of the droplet was defined by the combined heat transfer through effective conductivity and radiation model. The results of the numerical modeling of heat and mass transfer in water droplets in a wet flue gas flow of 1000 °C highlight the influence of the variation in heat transfer regimes in the droplet on the interaction of the transfer processes in consistently varying phase change regimes. The results of the investigation shows that the inner heat convection diminishes intensively in the transitional phase change regime because of a rapid slowdown of the slipping droplet in the gas. The radiation absorption in the droplet clearly decreases only at the final stage of equilibrium evaporation. The highlighted regularities of the interaction between combined transfer processes in water droplets are also valid for liquid fuel and other semi-transparent liquids sprayed into high-temperature flue gas flow. However, a qualitative evaluation should consider individual influence of dispersity that different liquids have.

Assessing the Impact of Climate Change on Water Usage in Typical Industrial Enterprises

“…where m 1 and m 2 represent crystalline water, and adhered water of the gypsum, m The amount of water evaporated can be calculated based on the temperature difference between the inlet and outlet of the flue gas (t 1 , t 2 ), the relative humidity at the inlet and outlet (ϕ 1 , ϕ 2 ), the air density at the inlet and outlet (ρ 1 , ρ 2 ), and the corresponding specific humidity at the inlet and outlet (χ 1 , χ 2 ), The amount of water evaporated can be calculated using Equation (11), where the specific humidity (χ) and air density (ρ) can be determined using Equations ( 12) and ( 13), respectively [32].…”