Average Vaporisation Rate in Turbulent Subcritical Two-Phase Flow

Sidhu, M. S. and Burluka, Alexey (2008) Average Vaporisation Rate in Turbulent Subcritical Two-Phase Flow. Combustion Science and Technology, 180 (5). pp. 975-996. ISSN 0010-2202

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Abstract

This work considers alternative expressions for turbulent evaporation rate used in the framework of an entirely Eulerian model based on a transport equation for the average liquid surface area. Commonly employed expressions for vaporisation rate derived from Spalding-Godsave theory fail to account for vaporisation enhancement induced by turbulence; moreover, they do not describe experimentally observed fact that the pressure affects vaporisation rate differently in a turbulent and a laminar flow. To address these shortcomings, an alternative formula for the vaporisation rate is proposed based on an assumption that the vaporisation rate is governed by a small-scale turbulence. This model is assessed for a range of pressure and temperature conditions, using experiments of Brandt et al. (1997a) performed in a premix duct with a flat-bed atomiser as the test case. Turbulence intensities and scales in the chosen test case are typical for a modern gas-turbine combustion chamber. This new expression results in prediction of evaporation rate and SMD in a good agreement with experimental results.

Item Type:	Article
Uncontrolled Keywords:	Eulerian modelling, Turbulent two-phase flow, Vaporisation rate
Subjects:	F300 Physics H300 Mechanical Engineering
Department:	Faculties > Engineering and Environment > Mechanical and Construction Engineering
Depositing User:	Paul Burns
Date Deposited:	30 Jan 2019 14:32
Last Modified:	11 Oct 2019 14:04
URI:	http://nrl.northumbria.ac.uk/id/eprint/37826

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