Experimental study on oil droplet breakup under the action of turbulent field in modified concentric cylinder rotating device

2020 ◽  
Vol 32 (8) ◽  
pp. 087105
Author(s):  
Yu Tian ◽  
Yangyang Tian ◽  
Guoxin Shi ◽  
Bo Zhou ◽  
Chunying Zhang ◽  
...  
Keyword(s):  
Experimental Study ◽  
Droplet Breakup ◽  
Concentric Cylinder ◽  
Oil Droplet ◽  
Turbulent Field

Oil droplet breakup during pressure swirl atomization of emulsions: Influence of emulsion viscosity and viscosity ratio

2022 ◽  
pp. 110941
Author(s):  
Martha L. Taboada ◽  
Eva Müller ◽  
Nora Fiedler ◽  
Heike P. Karbstein ◽  
Volker Gaukel
Keyword(s):  
Viscosity Ratio ◽  
Droplet Breakup ◽  
Oil Droplet ◽  
Pressure Swirl

Droplet breakup in subsurface oil releases – Part 1: Experimental study of droplet breakup and effectiveness of dispersant injection

2013 ◽  
Vol 73 (1) ◽  
pp. 319-326 ◽  
Author(s):  
Per Johan Brandvik ◽  
Øistein Johansen ◽  
Frode Leirvik ◽  
Umer Farooq ◽  
Per S. Daling
Keyword(s):  
Experimental Study ◽  
Droplet Breakup

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

The Effects of Surfactant on Simplex Nozzle Spray Behavior and its Comparison to Liquid Fuels

2013 ◽  
Author(s):  
Ashkan Davanlou ◽  
Joshua Lee ◽  
Saptarshi Basu ◽  
Ranganathan Kumar
Keyword(s):  
Experimental Study ◽  
Surface Tension ◽  
Numerical Models ◽  
Droplet Diameter ◽  
Pure Water ◽  
Diagnostic Technique ◽  
Injection Pressure ◽  
Droplet Breakup ◽  
Spray Angle ◽  
Breakup Length

Pressure-swirl nozzles (simplex nozzles) are used in various field applications such as aero-engines, power generation, spray painting and agricultural irrigation. For this particular nozzle, research in the past decade has dealt with the development of numerical models for predicting droplet distribution profiles. Although these results have been valuable, the experimental results have been contradictory, therefore fundamental understanding of the influence of properties in nozzle is important. This paper experimentally investigates the effect of surfactants on breakup and coalescence. Since most of the fuels and biofuels have low surface tension compared to water, a comparative analysis between a surfactant solution and a liquid fuel is imperative. For this experimental study, a simplex nozzle characterized as flow number 0.4 will be utilized. The injection pressures will range from 0.3–4Mpa while altering the surface tension from 72 to 28mN/m. By applying Phase Doppler Particle Anemometry (PDPA) which is a non-intrusive laser diagnostic technique, the differences in spray characteristics due to spray surface tension can be highlighted. The average droplet diameter decreases for a low surface tension fluid in the axial direction in comparison to pure water. The average velocity of droplets is surprisingly lower in the same spray zone. Measurements made in the radial direction show no significant changes, but at the locations close to the nozzle, water droplets have larger diameter and velocity. The results indicate the breakup and coalescence regimes have been altered when surface tension is lowered. A decrease in surface tension alters the breakup length while increasing the spray angle. Moreover, higher injection pressure shortens the breakup length and decrease in overall diameter of the droplets. By performing this experimental study the fundamentals of spray dynamics, such as spray formation, liquid breakup length, and droplet breakup regimes can be observed as a function of surface tension and how a surrogate fuel compares with a real fuel for experimental purposes. This knowledge potentially will lead to designing a better atomizer or new biofuels.

scholarly journals Breakup and Coalescence of Oil Droplets in Protein-Stabilized Emulsions During the Atomization and the Drying Step of a Spray Drying Process

2021 ◽  
Author(s):  
Martha L. Taboada ◽  
Doll Chutani ◽  
Heike P. Karbstein ◽  
Volker Gaukel
Keyword(s):  
Spray Drying ◽  
Droplet Size ◽  
Concentration Ratio ◽  
Oil Content ◽  
Droplet Breakup ◽  
Drying Process ◽  
Oil Droplets ◽  
Oil Droplet ◽  
Oil Concentration ◽  
Oil Droplet Size

AbstractThe goal of this study was to investigate the changes in oil droplet size in whey protein–stabilized emulsions during the atomization and the subsequent drying step of a spray drying process. For this purpose, experiments were performed in an atomization rig and a pilot spray dryer with two commercial pressure swirl atomizers. By comparing the oil droplet size before atomization, after atomization, and after spray drying, the changes in oil droplet size during each process step were quantified. The effect of oil droplet breakup during atomization was isolated by atomizing emulsions with 1 wt.% oil content and a protein to oil concentration ratio of 0.1. At 100 bar, the Sauter mean diameter of oil droplet size was reduced from 3.13 to 0.61 μm. Directly after breakup, coalescence of the oil droplets was observed for emulsions with a high oil content of 30 wt.%, leading to a droplet size after atomization of 1.15 μm. Increasing the protein to oil concentration ratio to 0.2 reduced coalescence during atomization and oil droplets with a mean diameter of 0.92 μm were obtained. Further coalescence was observed during the drying step: for an oil content of 30 wt.% and a protein to oil concentration ratio of 0.1 the mean droplet size increased to 1.77 μm. Powders produced at high oil contents showed a strong tendency to clump. Comparable effects were observed for a spray drying process with a different nozzle at 250 bar. The results confirm that droplet breakup and coalescence during atomization and coalescence during drying have to be taken into consideration when targeting specific oil droplet sizes in the product. This is relevant for product design in spray drying applications, in which the oil droplet size in the powder or after its redispersion determines product quality and stability.

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