Advancement in turbulent spray modelling: The effect of internal temperature gradient in droplets

A. Yu Snegirev, V. A. Talalov, A. S. Tsoi, S. S. Sazhin, C. Crua

Research output: Chapter in Book/Conference proceeding with ISSN or ISBNConference contribution with ISSN or ISBN

Abstract

Two simple and yet sufficiently accurate approaches to predict surface temperature of a vaporizing droplet (higher order polynomial approximation and the heat balance integral method) are proposed. Being computationally inexpensive these approaches are tested as candidates for use in high-resolution LES spray modelling. Robust and efficient numerical algorithm for solving inherently stiff equations of droplet heating and evaporation has been developed. Robustness and computational efficiency of the proposed algorithm is achieved by use of unconditionally stable strongly implicit integration scheme and appropriate adaptation of the time step. The above methodology has been implemented in CFD spray model included in the in-house Fire3D code. The spray model has been applied to replicate three essentially different experimental scenarios in which turbulent sprays of water, acetone, and diesel fuel were investigated. Reasonable agreement has been demonstrated for predicted and measured droplet sizes and velocities as well as for the spray tip penetration dynamics. New numerical algorithms used to calculate surface temperatures of evaporating droplets with non-uniform internal temperature did not incur observable increase of CPU time in turbulent spray simulations.

Original languageEnglish
Title of host publicationProceedings of CHT-12. ICHMT International Symposium on Advances in Computational Heat Transfer, 2012
PublisherBegell House, Inc.
Pages1065-1089
Number of pages25
ISBN (Print)9781567003031
DOIs
Publication statusPublished - 1 Jul 2012
EventInternational Symposium on Advances in Computational Heat Transfer, CHT 2012 - Bath, United Kingdom
Duration: 1 Jul 20126 Jul 2012

Publication series

NameInternational Symposium on Advances in Computational Heat Transfer
ISSN (Print)2578-5486

Conference

ConferenceInternational Symposium on Advances in Computational Heat Transfer, CHT 2012
CountryUnited Kingdom
CityBath
Period1/07/126/07/12

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    Snegirev, A. Y., Talalov, V. A., Tsoi, A. S., Sazhin, S. S., & Crua, C. (2012). Advancement in turbulent spray modelling: The effect of internal temperature gradient in droplets. In Proceedings of CHT-12. ICHMT International Symposium on Advances in Computational Heat Transfer, 2012 (pp. 1065-1089). (International Symposium on Advances in Computational Heat Transfer). Begell House, Inc.. https://doi.org/10.1615/ICHMT.2012.CHT-12.650