Deposition of poly[2-(perfluorooctyl)ethyl acrylate] from liquid CO2 high-pressure free meniscus coating—Uniformity and morphology

2007 ◽  
Vol 42 (1) ◽  
pp. 129-141 ◽  
Author(s):  
Jaehoon Kim ◽  
Ruben G. Carbonell
Keyword(s):  
High Pressure ◽  
Ethyl Acrylate ◽  
Liquid Co2 ◽  
Coating Uniformity

scholarly journals Numerical modeling of liquid CO2 phase transition blasting based on smoothed particle hydrodynamics algorithm

2019 ◽  
Vol 23 (Suppl. 3) ◽  
pp. 693-702
Author(s):  
Zhanbiao Yang ◽  
Yuejin Zhou ◽  
Xiaoding Xu ◽  
Wei Yi ◽  
Mingpeng Li ◽  
...  
Keyword(s):  
Phase Transition ◽  
High Pressure ◽  
Percussive Drilling ◽  
Propagation Criterion ◽  
Liquid Co2 ◽  
High Pressure Co2 ◽  
Particle Hydrodynamics ◽  
Crack Zone ◽  
Action Process ◽  
Sph Algorithm

Liquid CO2 phase transition blasting is a physical blasting method to enhance permeability through liquid CO2 phase transition expansion. To study the propagation criterion of fractures during blasting, the energy of phase transition blasting is evaluated through the thermodynamic equation by studying the action process of the liquid CO2 blasting, thus obtaining the scope of the smash zone and crack zone as well as the propagation criterion of fractures under the effect of high pressure gas. The gas blasting model for a coal body is established based on the SPH algorithm, thus obtaining the criteria for formation of the smash zone and for generatio and propagation of the crack zone. Moreover, the radius of phase transition blasting is surveyed onsite by the peephole method. It is shown that the explosive energy of the MZL-51/2000 phase transition blasting equipment with a release pressure of 270 MPa is 1510 kJ. The coal body is crushed by the high pressure CO2 percussive drilling, forming the smash zone. Meanwhile, fractures are generated around the smash zone. With the expansion and migratio of the gas, the fracture will further grow into a crack zone. The fracture inside the coal body goes through four states: rapid, slow, rapid, and then slow again. According to field surveys, the blasting radius of the MZL-51/2000 equipment with loaded liquid of 1.8 kg is approximately 3 m.

The pH Distribution During CO2 Dissolving Into Water Under Mid-Depth Sea Condition

2000 ◽  
Author(s):  
Satoshi Someya ◽  
Masahiro Nishio ◽  
Baixin Chen ◽  
Koji Okamoto ◽  
Tsutomu Uchida
Keyword(s):  
High Pressure ◽  
Co2 Concentration ◽  
Droplet Surface ◽  
Two Dimensional ◽  
Atmospheric Concentration ◽  
Ph Indicator ◽  
Intermediate Depth ◽  
Liquid Co2 ◽  
Hydrate Film ◽  
Dimensional Distribution

Abstract Sequestration of liquid CO2 into the intermediate depth ocean has been considered as a means to reduce atmospheric concentration of this greenhouse gas and mitigate global warming. A number of CO2 droplets are released and diluted into the intermediate ocean. The behavior of CO2 dissolution is very important in order to control the concentration of CO2 and to keep the environmental impact minimum. Under conditions in the intermediate ocean, that is, high pressure and low temperature, the CO2 clathrate hydrate film was formed on the CO2 droplet surface. The hydrate film has been considered to decrease the dissolution rate and the CO2 concentration near the droplet surface. The authors applied a LIF technique with a new kind of the dye as a pH indicator. The new dye in the CO2 dissolved water emitted intense fluorescence dependent on its pH. The visualized images showed the two dimensional distribution of the pH, i.e., CO2 concentration, around the CO2 droplet with or without the hydrate film.

Strahlschneiden mit flüssigem CO2 als Strahlmedium*/Jet cutting with liquid CO2 as jet medium - Qualifying high pressure CO2 jet cutting and comparison to water jet cutting

2016 ◽  
Vol 106 (10) ◽  
pp. 775-780
Author(s):  
E. Prof. Uhlmann ◽  
P. John ◽  
J. Mankiewicz
Keyword(s):  
High Pressure ◽  
Atmospheric Pressure ◽  
Experimental System ◽  
Water Jet ◽  
Basic Knowledge ◽  
System A ◽  
Water Jet Cutting ◽  
Liquid Co2 ◽  
High Pressure Co2

Hochdruckstrahlschneiden mit flüssigem CO2 bietet die Möglichkeit der trockenen sowie rückstandsfreien Bearbeitung unterschiedlichster Werkstoffe. Mithilfe eines experimentellen Versuchsstands können flüssige CO2-Strahlen mit einem Druck von bis zu 3000 bar erzeugt werden, die nach dem Austritt aus der Düse – trotz Atmosphärenbedingungen und Übergang in die Gasphase – zeitweise für die Bearbeitung von Werkstücken sowie Oberflächen nutzbar sind. Erste Versuche führten zu Grundlagenwissen über Strahlstoßkraft und Kerbgeometrien.   Cutting with a high-pressure CO2 jet has the potential for a dry and residue-free machining of various materials. With an experimental system a high-pressure liquid CO2 jet with up to 3000 bar expands into atmospheric pressure after exiting the nozzle and can be used for the machining of parts and surfaces. Investigations led to basic knowledge about jet force and notch geometries.

Sign in / Sign up

Export Citation Format

Share Document