期刊
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
卷 102, 期 -, 页码 657-668出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijheatmasstransfer.2016.06.052
关键词
Droplet collision; Bouncing; Impinging sprays; High pressure; KIVA-3V
资金
- Hong Kong Research Grants Council/General Research Fund [PolyU 152217/14E]
- Central Research Grants of the Hong Kong Polytechnic University [G-UA2M, G-UBGA]
Impingement of multiple diesel sprays under an elevated pressure of 30 atm is investigated numerically and experimentally, with the particular interest in illustrating the importance of taking into account of the ambient pressure effects in modeling binary droplet collisions. Specifically, a practical while simplified droplet collision model was proposed by modifying the widely-used Estrade et al.'s model to account for the previous experimental observation that hydrocarbon droplets tend to bounce back upon collision at elevated ambient pressures. The KIVA-3V program code implemented with the model was used to simulate the impinging sprays from the previous and the present experiments. The results show that the present model can produce qualitatively satisfactory predictions to the shape, the penetration length, and the Sauter mean diameter (SMD) of the impinging sprays because it accounts for the increased propensity of droplet bouncing at elevated pressures, which however was not considered in any previous models. Due to the limited experimental data on binary droplet collision at elevated pressures, the present model can be treated as a practical approximation for predicting droplet collision outcomes in sprays under high-pressure engine conditions. (C) 2016 Elsevier Ltd. All rights reserved.
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