A comparison of homogenous and separated flow assumptions for adiabatic capillary flow

A comparison of homogenous and separated flow assumptions for adiabatic capillary flow

Homogenous and separated flow models are investigated for use in modeling one-dimensional adiabatic capillary tube flow. While these methods have been utilized extensively within the literature, the current work provides a rigorous, quantitative comparison of their accuracy using recent experimental...

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Bibliographic Details
Published in:Applied thermal engineering Vol. 48; pp. 186 - 193
Main Authors: Furlong, Thomas W., Schmidt, David P.
Format: Journal Article
Language:English
Published: Kidlington Elsevier Ltd 15-12-2012
Elsevier
Subjects:
Adiabatic flow
Applied sciences
Capillary
Capillary flow
Computer simulation
Energy
Energy. Thermal use of fuels
Errors
Exact sciences and technology
Heat transfer
Homogenous
Separated
Separated flow
Statistical tests
Theoretical studies. Data and constants. Metering
Thermal engineering
Working fluids
Separated
Capillary
Homogenous
Statistical test
Accuracy
Simulation
Error
Modeling
Comparative study
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Summary:Homogenous and separated flow models are investigated for use in modeling one-dimensional adiabatic capillary tube flow. While these methods have been utilized extensively within the literature, the current work provides a rigorous, quantitative comparison of their accuracy using recent experimental data. Simulations utilizing the working fluids R134a, R600a, and R744 are performed for both methods and validated against experimental data. The mean error of the homogenous flow method is 8.55%, 5.4%, and 8.13%, respectively for R134a, R600a, and R744. The mean error of the separated flow method is 5.77%, 4.57%, and 8.03%, respectively for R134a, R600a, and R744. The separated flow method was found to have a smaller mean error and to perform better than the homogenous method as determined by non-parametric statistical tests. ► A homogeneous and a separated flow model are applied to capillary flows. ► A density-based discretization is used for the homogeneous model. ► The models are validated for different refrigerants, capillary geometries. ► The error shows clear non-normal tendencies and bias. ► Non-parametric statistical tests confirm the benefits of the separated flow model.
Bibliography:ObjectType-Article-2
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ISSN:1359-4311
DOI:10.1016/j.applthermaleng.2012.05.007