scholarly journals Euler/Lagrange Computations of Sprays Produced by Different Liquids using a Generalised Stochastic Droplet Collision Model

2021 ◽  
Vol 1 (1) ◽  
Author(s):  
Martin Sommerfeld ◽  
Santiago Lain
Fuel ◽  
2014 ◽  
Vol 115 ◽  
pp. 896-900 ◽  
Author(s):  
Ozgur Oguz Taskiran ◽  
Metin Ergeneman

Author(s):  
Martin Sommerfeld ◽  
Santiago Lain

Modelling of collisions between liquid droplets in the frame of a Lagrangian spray simulation has still many openissues, especially when considering higher viscous droplets and if colliding droplets have a large size difference. A generalisation of the collision maps is attempted based on the behaviour of characteristic points, namely the triple point where bouncing, coalescence and stretching separation coincide and the critical Weber-number where reflexive separation first occurs in head-on collisions. This is done by correlating experimental data with respect to the Capillary number with the Ohnesorge-number for the triple point and the critical Weber-number is also well described by a correlation the Ohnesorge-number. Based on these results the boundary line between stretching separation and coalescence is found by adapting the Jiang et al. (1992) correlation. For the upper boundary of reflexive separation the shifted Ashgriz and Poo (1990) correlation is used. It was however so far not possible to predict the lower bouncing boundary through the Estrade et al. (1999) boundary line correctly. The proposed boundary-line models were validated for various liquid, however still considering only a size ratio of one. With the developed three-line boundary model Euler/Lagrange numerical calculations for a simple spray system were conducted and the droplet collisions were analysed with respect to their occurrence. Droplet collision modelling is performed on the basis of the stochastic droplet collision  model,  also considering the influence  of impact efficiency, which so far was neglected for most spray simulations. The comparison with measurements showedreasonable good agreement for all properties.DOI: http://dx.doi.org/10.4995/ILASS2017.2017.4785


2003 ◽  
Vol 13 (2-3) ◽  
pp. 22 ◽  
Author(s):  
Gwon Hyun Ko ◽  
Seong Hyuk Lee ◽  
Hong Sun Ryou ◽  
Young Ki Choi

Fuel ◽  
2019 ◽  
Vol 251 ◽  
pp. 106-117 ◽  
Author(s):  
Yi Lu ◽  
Changlu Zhao ◽  
Zhenyu Zhang ◽  
Zhe Zuo ◽  
Weilong Lv

1998 ◽  
Vol 115 (5) ◽  
pp. 2047-2052 ◽  
Author(s):  
Virpi S. Niemela ◽  
Michael M. Shara ◽  
Debra J. Wallace ◽  
David R. Zurek ◽  
Anthony F. J. Moffat
Keyword(s):  

Author(s):  
Chien-Chang Chou

Navigational safety is an important issue in maritime transportation. The most frequent type of maritime accident in the port and coastal waters is the ship collision. Although some ship collision models have been developed in the past, few have taken account of wind and sea current effects. However, wind and sea current are critical factors in ship maneuvering. Therefore, based on the previous collision model without wind and sea current effects, this study further develops a ship collision model with wind and sea current effects. Finally, a comparison of the results for the proposed collision model in this study and the ship maneuvering simulator is shown to illustrate the effectiveness of the proposed mathematical model in this paper, followed by the conclusions and suggestions given to navigators, port managers, and governmental maritime departments to improve navigational safety in port and coastal waters.


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