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Experimental Investigation of Throttling Process Affected by Gas Impurities
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SYSNO ASEP 0332847 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Experimental Investigation of Throttling Process Affected by Gas Impurities Author(s) Vinš, Václav (UT-L) RID, ORCID
Vacek, V. (CZ)Source Title Experimental Fluid Mechanics 2009, Proceedings of the International Conference. - Liberec : Technical University of Liberec, 2009 / Vít T. ; Dančová P. ; Dvořák V. - ISBN 978-80-7372-538-9 Pages s. 411-417 Number of pages 7 s. Publication form CD ROM - CD ROM Action International Conference Experimental Fluid Mechanics 2009 Event date 25.11.2009-27.11.2009 VEvent location Liberec Country CZ - Czech Republic Event type EUR Language eng - English Country CZ - Czech Republic Keywords capillary tube ; experiment ; non-condensing gases ; throttling process Subject RIV BK - Fluid Dynamics CEZ AV0Z20760514 - UT-L (2005-2011) Annotation The throttling process in a small-diameter tube – capillary tube – was experimentally investigated in this study. A special testing capillary tube equipped with precise temperature and pressure sensors was used to describe the effect of gas impurities, i.e. non-condensing gases (nitrogen in our case), on the flow of throttled refrigerant R218. Total pressure at the onset of vaporization was increased by partial pressure of contaminating gas. Therefore, the two-phase flow of gas-contaminated refrigerant started to be generated notably earlier than in the case of pure refrigerant flow. Mass flow rate of refrigerant delivered through capillary tube decreased even by 20 % in some cases. The experimental data were compared with a numerical simulation of pure refrigerant flow in capillary tube. Workplace Institute of Thermomechanics Contact Marie Kajprová, kajprova@it.cas.cz, Tel.: 266 053 154 ; Jana Lahovská, jaja@it.cas.cz, Tel.: 266 053 823 Year of Publishing 2010
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