Drop entrainment in two-phase non concurrent film flow

Abstract

When the motion vectors of the media are collinear, well-known experimentally obtained empirical criteria are used to assess the conditions for the drop entrainment by the gas flow from the surface of a moving liquid film. However, blowing a liquid film at an angle with gas causes a tangential component in the film movement, which is an additional factor affecting its thickness and the velocity profile. The paper presents the correctness of the criterion of the conditions for the drop entrainment and the effect of the noncollinearity of the vectors of the media counterflow on the dynamics of a liquid film estimated from the results of numerical simulation.

Drop breakup and entrainment in the updraft

“…Wet flue‐gas desulfurization is a gas–liquid two‐phase reaction with high desulfurization efficiency, high reaction speed, and high utilization rate of desulfurization additives; as a result, it is widely used in coal‐fired power plants and other factories 19–21 . Although the application of this technology has greatly reduced the concentration of exhaust smoke pollutants, the entrainment of drops also leads to a series of new problems, such as gypsum rain and acid rain that pollute the power plant and surrounding environment, while also corroding equipment 22,23 . The spray tower is the core equipment in the wet flue‐gas desulfurization process of a coal‐fired power plant boiler tail gas 24–26 .…”

“…[19][20][21] Although the application of this technology has greatly reduced the concentration of exhaust smoke pollutants, the entrainment of drops also leads to a series of new problems, such as gypsum rain and acid rain that pollute the power plant and surrounding environment, while also corroding equipment. 22,23 The spray tower is the core equipment in the wet flue-gas desulfurization process of a coal-fired power plant boiler tail gas. [24][25][26] In the spray tower, the limestone slurry washes the flue gas, essentially a gas-liquid two-phase countercurrent contact process, and a gas-liquid mass transfer is accompanied by a two-phase flow process.…”