Light Scattering from Surface Waves on Carbon Dioxide Near the Critical Point

1969 ◽  
Vol 23 (14) ◽  
pp. 752-755 ◽  
Author(s):  
M. A. Bouchiat ◽  
J. Meunier
Keyword(s):  
Carbon Dioxide ◽  
Light Scattering ◽  
Surface Waves ◽  
Critical Point

The Critical Point Drying Method Applied to Scanning Electron Microscopy of L-929 Cells

1970 ◽  
Vol 28 ◽  
pp. 278-279
Author(s):  
Charles TurnbiLL ◽  
Delbert E. Philpott
Keyword(s):  
Electron Microscopy ◽  
Carbon Dioxide ◽  
Surface Tension ◽  
Critical Point ◽  
Freeze Drying ◽  
Attractive Alternative ◽  
Crystal Formation ◽  
Critical Point Drying ◽  
Time Required ◽  
Scanning Electron

The advent of the scanning electron microscope (SCEM) has renewed interest in preparing specimens by avoiding the forces of surface tension. The present method of freeze drying by Boyde and Barger (1969) and Small and Marszalek (1969) does prevent surface tension but ice crystal formation and time required for pumping out the specimen to dryness has discouraged us. We believe an attractive alternative to freeze drying is the critical point method originated by Anderson (1951; for electron microscopy. He avoided surface tension effects during drying by first exchanging the specimen water with alcohol, amy L acetate and then with carbon dioxide. He then selected a specific temperature (36.5°C) and pressure (72 Atm.) at which carbon dioxide would pass from the liquid to the gaseous phase without the effect of surface tension This combination of temperature and, pressure is known as the "critical point" of the Liquid.

The viscocity of carbon dioxide in the neighbourhood of the critical point

Physica ◽  
1964 ◽  
Vol 30 (1) ◽  
pp. 161-181 ◽  
Author(s):  
J. Kestin ◽  
J.H. Whitelaw ◽  
T.F. Zien
Keyword(s):  
Carbon Dioxide ◽  
Critical Point

Numerical Simulation of the Performance of an Axial Compressor Operating With Supercritical Carbon Dioxide

2018 ◽  
Author(s):  
Jinlan Gou ◽  
Wei Wang ◽  
Can Ma ◽  
Yong Li ◽  
Yuansheng Lin ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Numerical Simulation ◽  
Supercritical Carbon Dioxide ◽  
Critical Point ◽  
Mass Flow Rate ◽  
Mass Flow ◽  
Flow Rate ◽  
Axial Compressor ◽  
Brayton Cycle ◽  
Supercritical Carbon

Using supercritical carbon dioxide (SCO2) as the working fluid of a closed Brayton cycle gas turbine is widely recognized nowadays, because of its compact layout and high efficiency for modest turbine inlet temperature. It is an attractive option for geothermal, nuclear and solar energy conversion. Compressor is one of the key components for the supercritical carbon dioxide Brayton cycle. With established or developing small power supercritical carbon dioxide test loop, centrifugal compressor with small mass flow rate is mainly investigated and manufactured in the literature; however, nuclear energy conversion contains more power, and axial compressor is preferred to provide SCO2 compression with larger mass flow rate which is less studied in the literature. The performance of the axial supercritical carbon dioxide compressor is investigated in the current work. An axial supercritical carbon dioxide compressor with mass flow rate of 1000kg/s is designed. The thermodynamic region of the carbon dioxide is slightly above the vapor-liquid critical point with inlet total temperature 310K and total pressure 9MPa. Numerical simulation is then conducted to assess this axial compressor with look-up table adopted to handle the nonlinear variation property of supercritical carbon dioxide near the critical point. The results show that the performance of the design point of the designed axial compressor matches the primary target. Small corner separation occurs near the hub, and the flow motion of the tip leakage fluid is similar with the well-studied air compressor. Violent property variation near the critical point creates troubles for convergence near the stall condition, and the stall mechanism predictions are more difficult for the axial supercritical carbon dioxide compressor.

The Propagation of Sound in Carbon Dioxide Near the Critical Point

1951 ◽  
Vol 23 (4) ◽  
pp. 423-429 ◽  
Author(s):  
N. S. Anderson ◽  
L. P. Delsasso
Keyword(s):  
Carbon Dioxide ◽  
Critical Point

Dynamic light-scattering study of a diluted polymer blend near its critical point

1993 ◽  
Vol 47 (18) ◽  
pp. 12268-12271 ◽  
Author(s):  
Hirofumi Yajima ◽  
Dennis W. Hair ◽  
Alan I. Nakatani ◽  
Jack F. Douglas ◽  
Charles C. Han
Keyword(s):  
Light Scattering ◽  
Dynamic Light Scattering ◽  
Critical Point ◽  
Polymer Blend ◽  
Scattering Study
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