Experimental investigation on entrainment in two-phase free jets. (1st March 2023)

• Record Type: Journal Article
• Authors: Hotz, Christian; Haas, Manuel; Wachter, Simon; Fleck, Sabine; Kolb, Thomas
• Is Part Of: Fuel. Volume 335(2023)
• Publication Date: 2023-03-01
• Subjects: Two-phase free jet -- Entrainment -- Atomization; Fuel -- Periodicals; Coal -- Periodicals; Coal; Fuel; Periodicals; 662.6
• DOI: 10.1016/j.fuel.2022.126912
• Languages: English
• ISSNs: 0016-2361

Abstract

Highlights: Influence of atomization on the gas phase of a two-phase free jet is investigated. Common characteristics of the two-phase and the single-phase free jet are found. Semi-empirical model is adopted for the gas phase of the two-phase free jet. Empirical parameters for the two-phase free jet model are determined. Experimental data of the gas phase in the two-phase free jet is provided. Abstract: In the present research, the influence of atomization on the mixing ratio, representing entrainment in the gas phase of a two-phase free jet, is investigated at ambient conditions. The local mixing ratio is determined from the tracer gas (helium) concentration in the gas phase. Radial profiles of the mixing ratio are measured at several axial distances for 3 different nozzles applying 5 different gas-to-liquid ratios (GLR) for the two-phase free jet as well as a single-phase free jet. Common characteristics between the two-phase free jet and the single-phase free jet have been found. The mixing ratio of the two-phase free jet can be modeled using a semi-empirical approach for single-phase free jets from literature. The experimental data is used to determine the empirical parameters of the two-phase free jet model for the simulation of the flame structure in an entrained flow gasifier from Hotz et al., 2021 (https://doi.org/10.1016/j.fuel.2021.121392) (Hotz et al., 2021). The experimental data of the mixing ratio is available on Mendeley data as supplementary material of the present research (https://doi.org/10.17632/t66f8swg6w.1) (Hotz, 2022).