Influence of feed viscosity on the two-phase flow inside the exit orifice of an effervescent atomizer and on resulting spray characteristics

2015 ◽  
Vol 77 ◽  
pp. 55-62 ◽  
Author(s):  
P. Stähle ◽  
V. Gaukel ◽  
H.P. Schuchmann
Keyword(s):  
Two Phase Flow ◽  
Phase Flow ◽  
Spray Characteristics ◽  
Two Phase ◽  
Effervescent Atomizer ◽  
Exit Orifice

Internal two-phase flow and spray characteristics of outside-in-liquid twin-fluid atomizers

2021 ◽  
Vol 187 ◽  
pp. 116555
Author(s):  
Farid A. Hammad ◽  
Kai Sun ◽  
Zhizhao Che ◽  
Jan Jedelsky ◽  
Tianyou Wang
Keyword(s):  
Two Phase Flow ◽  
Phase Flow ◽  
Spray Characteristics ◽  
Two Phase

Investigation of Two-Phase Flow in an Effervescent Atomizer

2014 ◽  
Author(s):  
Mona Hassanzadeh Jobehdar ◽  
Aly H. Gadallah ◽  
Kamran Siddiqui ◽  
Wajid A. Chishty
Keyword(s):  
Internal Combustion Engines ◽  
Two Phase Flow ◽  
Separation Bubble ◽  
Phase Flow ◽  
Two Phase ◽  
Chamber Length ◽  
Flat Base ◽  
Mixing Chamber ◽  
Wide Range ◽  
Effervescent Atomizer

Aerated-liquid atomization, also called “effervescent atomization”, is a technique that has a wide range of applications such as gas turbine combustors, internal combustion engines, furnaces and burners, and pharmaceutical sprays. We report on an experimental study conducted to investigate the two-phase flow in an Effervescent atomizer. A novel aerator tube base was implemented and tested. It is observed that the novel configuration suppresses the separation bubble at the trailing edge and results in more uniform and smaller bubbles compared to the standard flat base aerator. It has been found that the more uniform and smaller bubbles are generated as the mixing chamber length is reduced. It is concluded that by using a conical base aerator and by reducing the mixing chamber length, the spray steadiness and the atomization process can be significantly improved.

Experimental Investigation of Choked Flow Conditions for Bubbly Flow

2019 ◽  
Author(s):  
Thomas Shepard ◽  
Aleksey Garbaly
Keyword(s):  
Flow Rate ◽  
Speed Of Sound ◽  
Two Phase Flow ◽  
Critical Conditions ◽  
Bulk Liquid ◽  
Phase Flow ◽  
Flow Conditions ◽  
Two Phase ◽  
Choked Flow ◽  
Effervescent Atomizer

Abstract In an effervescent atomizer, a bubbly two-phase mixture flows through a convergent section before exhausting from an exit orifice. It is commonly believed that one of the key effects of including bubbles is in the substantial decrease in the speed of sound experienced by the two-phase flow allowing for choked flow conditions at the exit. The existence of choked conditions would result in under-expanded bubbles that would further expand upon exiting the atomizer and provide additional forces to aid in the break-up of the bulk liquid into droplets. This study examines how the homogenous two-phase flow model of speed of sound, and thus critical conditions, compare with experiments in order to better understand the fundamental physics of effervescent atomization. In these experiments, an effervescent atomizer is connected to a vacuum chamber allowing for internal atomizer pressure, liquid flow rate and air flow rate to be monitored as the post-exit pressure is decreased. Experiments reveal that the flow remains subcritical well beyond conditions that the homogenous flow theory might predict being choked. High-speed imaging is used to capture internal atomizer bubble size.

Visualization of two phase flow inside an effervescent atomizer

2008 ◽  
Vol 11 (4) ◽  
pp. 299-308 ◽  
Author(s):  
X. Huang ◽  
X. Wang ◽  
G. Liao
Keyword(s):  
Two Phase Flow ◽  
Phase Flow ◽  
Two Phase ◽  
Effervescent Atomizer
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