SENSITIVITY OF PULSATING ORGANIC GEL POLYDISPERSE SPRAY DIFFUSION FLAMES TO EVAPORATION FREQUENCY DROPLET-SIZE DEPENDENCY

2009 ◽  
Vol 19 (6) ◽  
pp. 583-595 ◽  
Author(s):  
A. Kunin ◽  
J. Barry Greenberg ◽  
Benveniste Natan
Keyword(s):  
Droplet Size ◽  
Diffusion Flames ◽  
Size Dependency ◽  
Organic Gel

Organic Gel Spray Diffusion Flames-An Improved Model

2008 ◽  
Author(s):  
J Greenberg ◽  
Alina Kunin ◽  
Benny Natan
Keyword(s):  
Diffusion Flames ◽  
Improved Model ◽  
Organic Gel

Hot Spots in Organic Gel Spray Diffusion Flames

2006 ◽  
Author(s):  
Alina Kunin ◽  
J.Barry Greenberg ◽  
Benny Natan
Keyword(s):  
Hot Spots ◽  
Diffusion Flames ◽  
Organic Gel

Improved Eulerian-Lagrangian Spray Simulation by Using an Enhanced Momentum Coupling Model

2009 ◽  
Author(s):  
Sayop Kim ◽  
Sung Wook Park ◽  
Chang Sik Lee
Keyword(s):  
Droplet Size ◽  
Liquid Droplet ◽  
Computational Cost ◽  
Lagrangian Method ◽  
Grid Size ◽  
Simulation Code ◽  
Collision Model ◽  
Spray Tip Penetration ◽  
Size Dependency ◽  
Momentum Coupling

This study describes a strategy for reducing grid-size dependency that mainly comes from inaccurate calculation of the droplet-gas interactions and droplet collision modeling. The present paper suggests an enhanced momentum coupling (EMC) model and introduces the improved collision models to obtain the goal of reducing grid dependency. For conventional CFD codes, due to the low computational cost and effort, the Eulerian-Lagrangian method is preferred in simulating the multiphase flow, for instance, liquid spray penetrating into gaseous phase. However, it is well known that the spray computations are highly dependent on the grid resolution because momentum gain from liquid droplet less or more transferred to unit gaseous mass according to the grid cell volume, resulting in inaccurate prediction of droplet-gas relative velocity. For this reason, the grid-size dependency leads to inaccurate prediction of spray tip penetration and mean droplet size. To overcome the problem, in the present study, enhanced sub-models for reducing the grid dependency are introduced and implemented in the three dimensional engine simulation code, KIVA-3V. In the EMC model, keeping the standard Eulerian-Lagrangian method, the momentum coupling term in the momentum conservation equation of the Eulerian phase is revised and lack of momentum transfer due to inadequate cell resolution is compensated regarding the gaseous volume receiving the effective spray momentum. Computations were conducted using the EMC model, the gas-velocity interpolation scheme, and grid-size independent collision model under the high-pressure diesel injection conditions. From the results, the improved model composed of the EMC model and the grid independent collision model give a dramatic decrease in grid dependency of spray tip penetration and overall droplet size.

On the behaviour of organic gel multi-size spray diffusion flames

2008 ◽  
Vol 12 (5) ◽  
pp. 973-997 ◽  
Author(s):  
A. Kunin ◽  
J. B. Greenberg ◽  
B. Natan
Keyword(s):  
Diffusion Flames ◽  
Organic Gel

DROPLET SIZE DISTRIBUTIONS OF ADJUVANT-AMENDED SPRAYS FROM AN AIR-ASSISTED FIVE-PORT PWM NOZZLE

2011 ◽  
Vol 21 (3) ◽  
pp. 263-274 ◽  
Author(s):  
Jiabing Gu ◽  
Heping Zhu ◽  
Weimin Ding ◽  
Hong Young Jeon
Keyword(s):  
Droplet Size ◽  
Size Distributions ◽  
Droplet Size Distributions

MODELING DROPLET SIZE DISTRIBUTION NEAR A NOZZLE OUTLET IN AN ICING WIND TUNNEL

2006 ◽  
Vol 16 (6) ◽  
pp. 673-686 ◽  
Author(s):  
Laszlo E. Kollar ◽  
Masoud Farzaneh ◽  
Anatolij R. Karev
Keyword(s):  
Wind Tunnel ◽  
Size Distribution ◽  
Droplet Size ◽  
Droplet Size Distribution ◽  
Nozzle Outlet
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