Frictional pressure drop for two-phase air-water and R-410A were measured in small horizontal tubes of 1.02, 3.17 and 5.05 mm diameters. The tested results indicated that both the Chisholm correlation and the Friedel correlation failed to predict the data. Although the homogeneous model gives best predictions as compared to the Chisholm correlation and the Friedel correlation, over-predictions of air-water and underpredictions of R-410A are observed at higher mass flux and higher quality. It is likely that this deviation is related to the effects of surface tension and other physical properties. By introducing the Bond number and Weber number, the homogeneous flow model and the Friedel correlation are modified to correlate the test data. From the comparison, the predictive ability has been improved but it is imperative that further investigations should be made. This is because the present study only examines two kinds of working fluid, namely air-water and R-410A.


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    Title :

    Two-Phase frictional pressure drop correlations for small tubes


    Contributors:

    Conference:

    Space Technology and Applications International Forum - 2001 ; 2001 ; Albuquerque, New Mexico


    Published in:

    AIP Conference Proceedings ; 552 , 1 ; 247-254


    Publication date :

    2001-02-02


    Size :

    8 pages





    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English



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