Mass entrainment rate of an ideal momentum turbulent round jet

Fermín Franco Medrano, Yasuhide Fukumoto, Clara Marika Velte, Azur Hodžić

研究成果: Contribution to journalArticle

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We propose a two-phase-fluid model for a full-cone turbulent round jet that describes its dynamics in a simple but comprehensive manner with only the apex angle of the cone being a disposable parameter. The basic assumptions are that (i) the jet is statistically stationary and that (ii) it can be approximated by a mixture of two fluids with their phases in dynamic equilibrium. To derive the model, we impose conservation of the initial volume and total momentum fluxes. Our model equations admit analytical solutions for the composite density and velocity of the two-phase fluid, both as functions of the distance from the nozzle, from which the dynamic pressure and the mass entrainment rate are calculated. Assuming a far-field approximation, we theoretically derive a constant entrainment rate coefficient solely in terms of the cone angle. Moreover, we carry out experiments for a single-phase turbulent air jet and show that the predictions of our model compare well with this and other experimental data of atomizing liquid jets.

元の言語英語
記事番号034401
ジャーナルjournal of the physical society of japan
86
発行部数3
DOI
出版物ステータス出版済み - 2017

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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