NDLI: An improved model for flashing flow in short tubes [heat pumps]

Content Provider	IEEE Xplore Digital Library
Author	Tilton, J.D. Kornhauser, A.A.
Copyright Year	1996
Description	Author affiliation: Dept. of Mech. Eng., Virginia Polytech. Inst. & State Univ., Blacksburg, VA, USA (Tilton, J.D.)
Abstract	Short tube restrictors are commonly used as expansion devices in refrigeration and heat pumping systems. Flashing flow through short tubes is choked, i.e. independent of downstream conditions. Flow rate is typically predicted by empirically correcting the flow rate of compressed liquid from upstream pressure to saturation pressure at upstream temperature. The empirical correction factors depend on pressure and temperature, on short tube geometry and on the refrigerant used. This work extends and improves a model of short tube flow based on the physics of the observed flow phenomena. Short tube flow is believed to consist of a core of superheated liquid surrounded by an annulus of vapor. Evaporation is driven by heat transfer from the core to the interface and the flow is choked by the evaporated vapor. Flow rate is modeled by calculating the heat transfer rate, the evaporation rate and the choking effect of the vapor. The model attempts to improve on previous work by improving the accuracy with which thermodynamic properties are approximated, by improving the heat transfer model and by including the effects of frictional heating of the liquid. In comparison with experimental data, it is found that the improved thermodynamic modeling increases accuracy, but the change to the heat transfer model reduces accuracy. For the data examined, the effects of the frictional heating are small. The heat transfer model is based on an existing analytic solution with a mixing-length turbulence model. A appears that this model must be further improved, perhaps through empirical modification.
Starting Page	769
Ending Page	774
File Size	604573
Page Count	6
File Format	PDF
ISBN	0780335473
ISSN	10893547
DOI	10.1109/IECEC.1996.553794
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1996-08-11
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Heat transfer Refrigerants Equations Refrigeration Temperature dependence Geometry Thermodynamics Predictive models Orifices Mechanical engineering
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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