Experimental Study of Droplet Size Distribution Produced by a Multi-Orifice Effervescent Atomizer

2012 ◽  
Vol 166-169 ◽  
pp. 3056-3059 ◽  
Author(s):  
Fang Xu ◽  
Wei Dong ◽  
Liang Qiang
Keyword(s):  
Experimental Study ◽  
Size Distribution ◽  
Droplet Size ◽  
Flow Rate ◽  
Water Flow Rate ◽  
Injection Pressure ◽  
Droplet Size Distribution ◽  
Liquid Injection ◽  
Effervescent Atomizer ◽  
Pressure Water

A new multi-orifice effervescent atomizer used for fire fighting was developed. The droplet size distribution of the spray produced by the nozzle was measured by laser Doppler particle analyzer. And the influence of liquid injection pressure, water flow rate and atomizer internal geometry was studied.

An experimental study on oil droplet size distribution in subsurface oil releases

2018 ◽  
Vol 37 (11) ◽  
pp. 88-95 ◽  
Author(s):  
Jianwei Li ◽  
Wei An ◽  
Huiwang Gao ◽  
Yupeng Zhao ◽  
Yonggen Sun
Keyword(s):  
Experimental Study ◽  
Size Distribution ◽  
Droplet Size ◽  
Droplet Size Distribution ◽  
Oil Droplet ◽  
Oil Droplet Size

Influence of Semicontinuous Processing on the Rheology and Droplet Size Distribution of Mayonnaise-like Emulsions

2009 ◽  
Vol 15 (4) ◽  
pp. 367-373 ◽  
Author(s):  
C. Bengoechea ◽  
M.L. López ◽  
F. Cordobés ◽  
A. Guerrero
Keyword(s):  
Size Distribution ◽  
Droplet Size ◽  
Flow Rate ◽  
Droplet Size Distribution ◽  
Egg Yolk ◽  
Continuous Phase ◽  
Agitation Speed ◽  
Viscosity Data ◽  
Pumping System ◽  
Oil In Water

Oil-in-water (o/w) emulsions stabilized by egg yolk, with a composition similar to those found in commercial mayonnaises or salad dressings, were processed in a semicontinuous device. This specially designed emulsification device consists of, basically, a vessel provided with an anchor impeller, where the continuous phase was initially placed; a pumping system that controls the addition of the oily phase; a rotor-stator unit, where the major breaking of the oily droplets takes place, and a recirculation system. The design allowed the introduction of a rotational rheometer to obtain viscosity data along the emulsification process. The most important advantages of this in-line emulsification device, when compared to discontinuous emulsification equipment, are the possibilities of recording viscosity data along the process and the higher values for the storage, G', and loss moduli, G'', of the resulting emulsions. The influence of egg yolk concentration, agitation speed, and flow rate over the rheological properties (G', G'') as well as droplet size distribution were investigated. Higher protein concentration, agitation speed and flow rate generally produce emulsions with higher G' and G'' values.

Droplet Formation Through Centrifugal Pumps for Oil-in-Water Dispersions

SPE Journal ◽  
2012 ◽  
Vol 18 (01) ◽  
pp. 172-178 ◽  
Author(s):  
Rosanel Morales ◽  
Eduardo Pereyra ◽  
Shoubo Wang ◽  
Ovadia Shoham
Keyword(s):  
Size Distribution ◽  
Centrifugal Pump ◽  
Droplet Size ◽  
Flow Rate ◽  
Droplet Size Distribution ◽  
Droplet Formation ◽  
Centrifugal Pumps ◽  
Mixture Flow ◽  
Pump Speed ◽  
Water Cut

Summary Droplet formation in oil/water flow through a centrifugal pump has been studied, experimentally and theoretically, for the first time. Droplet-size distribution at the pump outlet has been measured for water-continuous flow as a function of pump speed, mixture-flow rate, and water cut. The measured droplet-size distribution strongly depends on the pump speed: the higher the pump speed, the smaller the droplet size. Negligible effects of mixture-flow rate, water cut, and inlet droplet-size distribution have been observed. Turbulent breakup has been identified as the main mechanism for droplet formation. A mechanistic model is developed for the prediction of droplet-size distribution in a centrifugal pump, showing a fair agreement with the acquired experimental data.

Effect of Inlet Tangential Port Area on Droplet Size Distribution of Small-Scale Simplex Atomizer

2013 ◽  
Author(s):  
Muthu Selvan Govindaraj ◽  
Muralidhara H. Suryanarayana Rao ◽  
Vinod Kumar Vyas ◽  
Karthy Shanmugasundaram ◽  
Narendran Venugopal ◽  
...  
Keyword(s):  
Size Distribution ◽  
Droplet Size ◽  
Flow Direction ◽  
Injection Pressure ◽  
Droplet Size Distribution ◽  
Working Fluid ◽  
Small Scale ◽  
Size Distributions ◽  
Port Area ◽  
Droplet Size Distributions

An experimental investigation was conducted to study the effects of increased area of inlet tangential ports on the droplet size distribution of small-scale simplex atomizer. The spray characteristics of four different simplex atomizers representing increasing area of inlet tangential ports (diameter range 0.6 mm to 0.9 mm) are examined using water as working fluid. Measurements of droplet size and droplet size distributions of the four different atomizer configurations were carried using Malvern droplet size instrument at various downstream locations from final orifice exit. These measurments has been taken for five different injection pressures of spray. Variation of droplet size and droplet size distribution along the flow direction of spray was examined. The effect of increase in injection pressure on droplet size distribution of the spray was examined. Increase in inlet tangential port area significantly affects droplet size and droplet size distributions of the spray and affects the length of primary breakup region.

Axial and Radial Variation of Spray Characteristics of a Small-Scale Simplex Atomizer

2014 ◽  
Author(s):  
Muthuselvan Govindaraj ◽  
Muralidhara Halebidu Suryanarayana ◽  
Vinod Kumar Vyas ◽  
Jeyaseelan Rajendran ◽  
Rajeshwari Natarajan ◽  
...  
Keyword(s):  
Size Distribution ◽  
Droplet Size ◽  
Radial Direction ◽  
Cone Angle ◽  
Injection Pressure ◽  
Droplet Size Distribution ◽  
Axial Direction ◽  
Spray Cone Angle ◽  
Spray Cone ◽  
Injection Pressures

Simplex atomizer is widely used in the liquid fuel combustion devices in aerospace and power generation industries. An experimental work was conducted, to study variation of SMD and droplet size distribution along axial and radial directions of the spray for different injection pressures. Malvern spray analyzer is used in the present investigation. Four different atomizer configurations of increasing atomizer constant (K) are examined using water and kerosene. Spray cone angle is measured for different configurations at different injection pressures (up to 30 bar) using image processing technique. In the case of atomizer with lower K, spray cone angle continuously increases with injection pressure. In the case of atomizer with higher K, initially spray cone angle increases significantly, but remains almost constant after 16 bar. Variation of SMD and droplet size distribution along axial direction of the spray is compared between water and kerosene spray. SMD variation along the axial direction of spray clearly shows the continuous brakup of droplets along axial direction of the spray. In the case of water spray, SMD rapidly decreases along the axial direction up to 30 mm from the orifice exit, and gradually decreases up to 120 mm. In the case of kerosene spray, SMD rapidly decreases along the axial direction up to 40 mm from the orifice exit, after that SMD fluctuates along the axial direction up to 100 mm from the orifice exit. This fluctuation is due to evaporation of smaller droplets (50 microns) of kerosene. Span also continuously fluctuates after 40 mm from the orifice exit in the case of kerosene spray. Variation of SMD and droplet size distribution along radial direction of the spray is compared for different injection pressure and configurations of simplex atomizer. Increase in injection pressure, increases the disruptive aerodynamic force, which reduces the radial peak value of SMD and widens the radial profile. With decrease in atomizer constant (K), swirl strength inside the swirl chamber increases, which in turn increases the spray cone angle. SMD variation along the radial direction of spray showed more uniform droplet diameter distribution for lower atomizer constant (K) configurations. Reducing the atomizer constant improves the atomization quality more effectively than increasing the injection pressure.

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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