Experimental Investigation of Throttling Process Affected by Gas Impurities

0332847 - ÚT 2010 RIV CZ eng C - Conference Paper (international conference)
Vinš, Václav - Vacek, V.
Experimental Investigation of Throttling Process Affected by Gas Impurities.
Experimental Fluid Mechanics 2009. Liberec: Technical University of Liberec, 2009 - (Vít, T.; Dančová, P.; Dvořák, V.), s. 411-417. ISBN 978-80-7372-538-9.
[International Conference Experimental Fluid Mechanics 2009. Liberec (CZ), 25.11.2009-27.11.2009]
Institutional research plan: CEZ:AV0Z20760514
Keywords : capillary tube * experiment * non-condensing gases * throttling process
Subject RIV: BK - Fluid Dynamics

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.
Permanent Link: http://hdl.handle.net/11104/0177975