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International Heat Transfer Conference 9

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

INSTATIONARY HEAT TRANSFER IN A PRESSURE VESSEL DURING EXPANSION PROCESS

Rudolf Eggers
Institute of Thermal and Separation Processes, Hamburg University of Technology, Eissendorfer Str. 38, D-21073 Hamburg, Germany

Virginia Green
Technische Universitat Hamburg-Harburg Eissendorfer Str. 38, D-2100 Hamburg 90 FRG

DOI: 10.1615/IHTC9.1540
pages 401-405

要約

In case of extraction processes going on discontinuously with supercritical carbon dioxide, the extraction vessel must be depressurized after the process is finished for charging and discharging of the solid. During pressure relief procedure, the temperature of the carbon dioxide in the pressure vessel is considerably falling up to the development of dry ice. The vessel wall is being discharged by heat transfer to the fluid.
While setting this work, a simulation process has been developed for experimental determination of the heat transfer coefficient from the vessel wall to the fluid by measuring the wall temperature at two places.
A highly instationary behaviour of the heat transfer coefficient during the expansion process has been realized.

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