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Study on Density and Refractive Index of Near-critical Fluid

Author: XiaGuoZheng
Tutor: ChenLiangCai
School: Huazhong University of Science and Technology
Course: Chemical Process Equipment
Keywords: Near - critical fluids Index of refraction Density Raytrace
CLC: TQ021.1
Type: Master's thesis
Year: 2009
Downloads: 14
Quote: 0
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Abstract


Very significant effect on the characteristics of the fluid in the near-critical region affected by temperature, pressure , and small temperature or pressure changes can be such that the fluid density and other properties of a distinct change . Study the near critical region within the fluid density and the refractive index changes with temperature, pressure relationship of the optical characteristics of the fluid in the near-critical region , and is expected to lasers tuned , compressing the laser pulse, to improve the quality of the laser beam or the like to provide a new effective way . Experimental system the desired high pressure, created by the hydraulic booster ; upper pressure limit can be adjusted , and the pressure reduction can be controlled through the valve hand . A desired temperature of the experiment , can be achieved by adjusting the temperature of the thermostat water bath circulation . Buy high purity of bottled fluid from the source to ensure the purity of the experimental medium ; pipeline filter to exclude the possibility of a the pipeline hydraulic oil impurities into the optical cell ; optical cell with pure experimental fluid flush and \Isothermal step-down method adopted in the near - critical region , the relationship between carbon dioxide and sulfur hexafluoride in the subcritical region , the area of near-critical and supercritical region of experimental phenomena , refractive index and temperature pressure were recorded . Calculated and described light trajectory in the optical cell , the analysis of the reasons for the formation of the spot shape and the offset distance in the different states . Experiment, we found that the fluid refractive index in the critical point of divergence, the more the greater the refractive index close to the critical point , away from the rapid decline of the refractive index of the critical point . The study shows that , the subcritical fluid density is uniform distribution of light travels in straight lines ; near critical fluid density gradient the light produces significantly deflection ; critical point at the huge fluctuations in the density , light divergence ; supercritical state and restore uniformity , light travels in straight lines .

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CLC: > Industrial Technology > Chemical Industry > General issues > Chemical processes ( physical processes and physical and chemical processes ) > Basic theory > Hydrodynamic processes and principles
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