Jump to ContentJump to Main Navigation
Show Summary Details
More options …

Mathematical Modelling in Civil Engineering

The Journal of Technical University of Civil Engineering of Bucharest

4 Issues per year

Open Access
See all formats and pricing
More options …

Comparison of Two-Phase Pressure Drop Models for Condensing Flows in Horizontal Tubes

Alina Filip / Florin Băltăreţu
  • Associate Professor, Dr. Eng., Technical University of Civil Engineering Bucharest, Thermal Engineering Department
  • Email
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Radu-Mircea Damian
  • Professor, Dr. Eng., Technical University of Civil Engineering Bucharest, Department of Hydraulics and Environmental Protection
  • Email
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
Published Online: 2015-03-03 | DOI: https://doi.org/10.2478/mmce-2014-0019


An important parameter in the hydraulic design of refrigeration and air-conditioning systems is the two-phase flow pressure drop. In this paper, the authors compare the numerical results obtained by using seven two-phase pressure-drop models with the experimental results found in the scientific literature, for the condensation of R600a and R717 (Ammonia = NH3) in horizontal tubes. Different mass flow rates and different conditions have been considered in order to see which correlation is applicable under specific operation conditions.

Keywords: two-phase pressure drop; refrigerant; condensation


  • [1] Popescu Fl., Andrei V. & Damian R.M. (2005). Dinamica fluidelor polifazice, Galaţi: Editura Fundaţiei Universitare “Dunărea de Jos”.Google Scholar

  • [2] Kim S.-M., Mudawar I. (2014). Review of databases and predictive methods for pressure drop in adiabatic, condensing and boiling mini/micro-channel flows, International Journal of Heat and Mass Transfer, 77, 74-97. DOI: 10.1016/j.ijheatmasstransfer.2014.04.035.CrossrefWeb of ScienceGoogle Scholar

  • [3] Lockhart R.W., Martinelli R.G. (1949). Proposed correlation of data for isothermal two-phase, two-component flow in pipes. Chem. Eng. Prog. 45(1), pp. 39-48.Google Scholar

  • [4] Chisholm D. (1967). A theoretical basis for the Lockhard-Martinelli correlation for two-phase flow, International Journal of Heat and Mass Transfer, 10, 1767-1778. DOI: 10.1016/0017-9310(67)90047-6.CrossrefGoogle Scholar

  • [5] Friedel L. (1979). Improved friction pressure drop correlations for horizontal and vertical two-phase pipe flow, In European Two-Phase Group Meeting, Ispra, Italy, Paper E2.Google Scholar

  • [6] Chen I.Y., Yang K.-S., Chang Y.J., Wang C.-C. (2001). Two-phase pressure drop of air-water and R-410A in small horizontal tubes, International Journal of Multiphase Flow, Volume 27, 1293-1299. DOI: 10.1016/S0301-9322(01)00004-0.CrossrefGoogle Scholar

  • [7] Cavallini A., Rossetto L., Matkovic M., Del Col D. (2005). A model for frictional pressure drop during vapour-liquid flow in minichannels. IIR International Conference Thermophysical Properties and Transfer Processes of Refrigerants, 31 August-2 September, Vicenza, Italy , pp. 71-78.Google Scholar

  • [8] Müller-Steinhagen H., Heck K. (1986). A Simple Friction Pressure Drop Correlation for Two-Phase Flow in Pipes, Chem. Eng. Process., 20, 297-308. DOI: 10.1016/0255-2701(86)80008-3.CrossrefGoogle Scholar

  • [9] Jung D.S., Radermacher R. (1989). Prediction of pressure drop during horizontal annular flow boiling of pure and mixed refrigerants, Int. J. Heat Mass Transfer, 32, 2435-2446. DOI: 10.1016/0017-9310(89)90203-2.CrossrefGoogle Scholar

  • [10] Dalkilic A.S., Agra O., Teke I., Wongwises S. (2010). Comparison of frictional pressure drop models during annular flow condensation of R600a in a horizontal tube at low mass flux and of R134a in a vertical tube at high mass flux, International Journal of Heat and Mass Transfer, 53, 2052-2064. DOI: 10.1016/j.ijheatmasstransfer.2008.12.001.CrossrefWeb of ScienceGoogle Scholar

  • [11] da Silva Lima R.J., Quiben J.M., Kuhn C., Boyman T., Thome J.R. (2009). Ammonia two-phase flow in a horizontal smooth tube: Flow pattern observations, diabatic and adiabatic frictional pressure drops and assessment of prediction methods, International Journal of Heat and Mass Transfer, 52, 2273-2288. DOI: 10.1016/j.ijheatmasstransfer.2008.12.001.CrossrefWeb of ScienceGoogle Scholar

About the article

Published Online: 2015-03-03

Published in Print: 2014-12-01

Citation Information: Mathematical Modelling in Civil Engineering, Volume 10, Issue 4, Pages 19–27, ISSN (Online) 2066-6934, DOI: https://doi.org/10.2478/mmce-2014-0019.

Export Citation

© by Alina Filip. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. BY-NC-ND 3.0

Comments (0)

Please log in or register to comment.
Log in