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Atomization and Sprays
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ISSN 印刷: 1044-5110
ISSN オンライン: 1936-2684

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Atomization and Sprays

DOI: 10.1615/AtomizSpr.v11.i1.50
pages 85-105

DEVELOPMENT OF A NEW MODEL AND HEAT TRANSFER ANALYSIS OF IMPINGING DIESEL SPRAYS ON A WALL

Seong Hyuk Lee
Chung-Ang University
Hong Sun Ryou
School of Mechanical Engineering, Chung-Ang University, Chung-Ang University 221, HeukSuk Dong, DongJak Ku, Seoul, 156-756, Korea

要約

A new impingement model for diesel sprays with a modified film model is developed. The model is based on the energy conservation law and experimental results, and developed by the proposition of several mathematical formulas to determine the postimpingement characteristics of droplets. The new impingement model consists of three representative regimes - rebound, deposition, and splash. Also, the film model based on the earlier research is modified and simplified to simulate the transient behavior of the film deposited on the wall. The gas phase is modeled in terms of the Eulerian conservation equations, and the spray is calculated using a discrete droplet model, in which representative droplets move through and interact with the gas phase. To assess the new model, numerical results using the new model are compared with experimental data and the results obtained by previous impingement models for the nonevaporative spray and the evaporative spray. The results show that the new model is generally in better agreement with experimental data than previous impingement models. It is thought that the present film model is acceptable for prediction of the film radius and thickness. Also, the heat transfer model used in this study effectively predicts the point of time at which the maximum wall heat flux occurs and the maximum value.


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