A Study of the Flow through Capillary Tubes Tuned for a Cooling Circuit with Saturated Fluorocarbon Refrigerants |
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Authors: | Vaclav Vacek Vaclav Vin? |
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Affiliation: | (1) Department of Applied Physics, Faculty of Mechanical Engineering, Czech Technical University in Prague, Technicka 4, Prague 6, 16607, Czech Republic |
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Abstract: | Capillary tube expansion devices are widely used in refrigeration equipment; nevertheless, the mechanism of the flow is still
not fully described and understood, so the experimental verification of most predictions is still necessary. A modified numerical
model of capillary flow has been developed both for standard refrigerants and with emphasis for saturated fluorocarbon (C2F2n+2) refrigerants. These refrigerants have several unique properties (high dielectric performance, chemical stability, and radiation
resistance). Therefore, they can be used in some special applications, where other common fluids cannot be applied. The main
aim of this study was to prepare a practical capillary flow model, which would improve the procedure of predicting the behavior
of capillary tubes for cooling circuits of particle detectors being built at the international CERN laboratory in Geneva.
The generated numerical model was verified through available data from the literature and also via measurements performed
in a real cooling circuit with pure, oil-free octafluoropropane (C3F8) refrigerant.
Paper presented at the Seventeenth European Conference on Thermophysical Properties, September 5–8, 2005, Bratislava, Slovak
Republic. |
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Keywords: | Capillary tube Cooling circuit Fluorocarbon refrigerant Model comparisons Two-phase flow |
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