High-Speed Droplet Impact as an Elementary Process of Physical Cleaning

2019 ◽  
Vol 41 (5) ◽  
pp. 67-74 ◽  
Author(s):  
Toshihide Fujikawa ◽  
Yuuki Tatekura ◽  
Kazumichi Kobayashi ◽  
Toshiyuki Sanada ◽  
Atsushi Hayashida ◽  
...  
Keyword(s):  
High Speed ◽  
Droplet Impact ◽  
Elementary Process

scholarly journals Liquid Film Flow Generated by High-speed Droplet Impact in Low-pressure Environment

2015 ◽  
Vol 28 (5) ◽  
pp. 531-537
Author(s):  
Masaya KATO ◽  
Masao WATANABE ◽  
Kazumichi KOBAYASHI ◽  
Toshiyuki SANADA
Keyword(s):  
Liquid Film ◽  
High Speed ◽  
Film Flow ◽  
Low Pressure ◽  
Droplet Impact ◽  
Liquid Film Flow

scholarly journals A Σ-ϒ two-fluid model with dynamic local topology detection: Application to high-speed droplet impact

2020 ◽  
Vol 408 ◽  
pp. 109225 ◽  
Author(s):  
Georgia Nykteri ◽  
Phoevos Koukouvinis ◽  
Silvestre Roberto Gonzalez Avila ◽  
Claus-Dieter Ohl ◽  
Manolis Gavaises
Keyword(s):  
High Speed ◽  
Fluid Model ◽  
Droplet Impact ◽  
Two Fluid Model ◽  
Local Topology ◽  
Two Fluid

Polychromatic Coloring of Dental Zirconia by Inkjet Printing

2019 ◽  
Author(s):  
Christoph Rehekampff ◽  
Dominik Rumschöttel ◽  
Franz Irlinger ◽  
Tim C. Lueth
Keyword(s):  
Surface Tension ◽  
Pore Size ◽  
Inkjet Printing ◽  
High Speed ◽  
Three Dimensional ◽  
Droplet Impact ◽  
High Speed Camera ◽  
Color Transition ◽  
Color Scale

Abstract To enable the development of an automated coloring process, dental zirconia is examined in terms of porosity, pore size and shrinkage during sintering. The properties of commercially available metal ionic inks such as viscosity, density and surface tension are investigated. Droplet impact on the zirconia surface and the absorption into the pores is analyzed with a high speed camera. The color result after sintering is investigated and compared to tooth samples. A method is developed to achieve a realistic, smooth color transition on flat zirconia samples. This is achieved by mixing the single inks directly on the zirconia through sequential application. Consequently, the number of different inks required to reproduce the full dental color scale can be reduced. Additionally, three dimensional tooth replacements are colored with the developed method.

Dynamic Contact Angle of Modified Biopolymer Droplet on Urea Surface: Temperature Effects

2013 ◽  
Vol 594-595 ◽  
pp. 566-570 ◽  
Author(s):  
Yon Norasyikin Samsudin ◽  
Ku Zilati Ku Shaari ◽  
Zakaria Man ◽  
Suriati Sufian
Keyword(s):  
Contact Angle ◽  
High Speed ◽  
Dynamic Contact Angle ◽  
Ccd Camera ◽  
Dynamic Contact ◽  
Droplet Impact ◽  
Coating Material ◽  
Coating Process ◽  
Fluidised Bed ◽  
Impact Behaviour

The droplet impact behaviour provides the particle coating characterization during the coating process of controlled release fertiliser. To have a good coating uniformity around the urea granules, it is necessary to enhance the wettabitily properties between the coating material and urea surface. The biopolymer material is preferred as the coating material because this polymer may degrade and will not cause any environmental impact to the environment. Various compositions of starch/urea /borate/lignin were prepared and evaluated for the wettability properties. The wettability characteristic measured is the dynamic contact angle. The high speed Charged-Couple Device (CCD) camera was used to capture the images of this droplet impact behaviour. Temperature plays an important factor during wetting stage because the coating material must be completely dried in continuous coating process in fluidised bed. From this analysis, it indicates that a composition of starch/urea/ borate (50/15/2.5) with 10% lignin has the best wettability characteristic and thus suitable to be used as a coating material. The ideal temperature for the coating process is 60°C.

SUMMARY OF STUDIES OF COREXIT DISPERSANT DROPLET IMPACT BEHAVIOR INTO OIL SLICKS AND DISPERSANT DROPLET EVAPORATION1,2

2008 ◽  
Vol 2008 (1) ◽  
pp. 797-800 ◽  
Author(s):  
Timothy A. Ebert ◽  
Roger Downer ◽  
James Clark ◽  
Charles A. Huber
Keyword(s):  
High Speed ◽  
Impact Analysis ◽  
Droplet Impact ◽  
Impact Behavior ◽  
Oil Slick ◽  
Corexit 9500 ◽  
Droplet Sizes ◽  
Evaporative Loss ◽  
Pass Through ◽  
Oil Films

ABSTRACT This paper presents the results of two related studies concerning the aerial application of dispersants. The first study characterized the interactions of various sized Corexit 9500 and 9527 dispersant droplets with oil films of from 0.1 mm to 3.0 mm thickness. A film thickness of 0.1 mm was selected as the end point since this is the thinnest oil film recommended for the application of dispersants. The results of the high speed video droplet impact analysis showed that droplet diameters of 1,000 microns will not pass through an oil slick of 0.1 mm and mix with the underlying water column and that slick thickness of 0.2 mm or more will prevent even 2,000 micron diameter droplets from passing through the slick. These droplet sizes are considerably larger than the current ASTM Standard recommended droplet size of 300–500 microns for dispersant application. Additionally, it was shown that droplets that do pass through an oil slick will in whole or in part rise back up to the oil water interface. The second study characterized and compared the evaporation rates of Corexit 9500 and 9527 droplets with water over a 20 minute period under varying conditions of humidity and temperature. Under high evaporative conditions of high temperature (90° F) and low humidity (40%), droplets ranging from 0.25 to 1 uL showed 2–10% evaporative loss for Corexit 9500, 28–35% evaporative loss for Corexit 9527, and complete evaporative loss for water. When tested at low evaporative conditions of low temperature (40° F) and high humidity (95%), no evaporative loss was recorded for droplets of either 9500 or 9527, and water lost 18%.

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