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Pressure Drop in Microtubes and Correlation Development  

Hwang, Yun-Wook (Energy System Research Center, Korea Institute of Machinery and Materials)
Kim, Ju-Hyok (School of Mechanical and Aerospace Engineering, Seoul National university)
Kim, Min-Soo (School of Mechanical and Aerospace Engineering, Seoul National university)
Publication Information
Korean Journal of Air-Conditioning and Refrigeration Engineering / v.18, no.1, 2006 , pp. 38-46 More about this Journal
Abstract
The characteristics about the pressure drop in microtubes have been investigated. The test tubes are the circular, seamless, stainless steel tubes with an inner diameter of 0.244, 0.430, and 0.792 mm, respectively. R-l34a was used as a test fluid. Early flow transition which has been reported in some previous studies is not found in single-phase flow pressure drop tests. The conventional theory between friction factor and Reynolds number predicted the experimental friction factors within an absolute average deviation of $8.9\%$. The two-phase flow pressure drop increases for higher quality and mass flux, and for reduced inner diameter. The existing correlations fail to predict the experimental data. A new correlation to predict the two-phase flow pressure drop is developed in the form of the Lockhart-Martinelli correlation. The effects of the tube diameter and the surface tension were considered, and the correlation predicted the experimental data within an average absolute deviation of $8.1\%$.
Keywords
Microtube; Pressure drop; Friction factor; Two-phase frictional multiplier;
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1 Choi, S. B., Barron, R. F. and Warrington, R. O., 1991, Fluid flow and heat transfer in microtubes, Micromechanical Sensors, Actuators, and Systems, DSC- Vol. 32, pp. 123-134
2 Li, D. and Garimella, S. V., 2004, Investigation of liquid flow in microchannels, AIAA Journal of Thermophysics and Heat Transfer, Vol. 18, pp. 65-72   DOI   ScienceOn
3 Lockhart, R. W. and Martinelli, R. C., 1949, Proposed correlation of data for isothermal two-phase two-component flow in pipes, Chem. Eng. Prog., Vol. 45, p. 39
4 Yu, D., Warrington, R., Barron, R. and Ameel, T., 1995, An experimental and theoretical investigation of fluid flow and heat transfer in microtubes, ASME/JSME Thermal Eng. Conf., Vol. 1, pp.523-530
5 Lee, H. J. and Lee, S. Y., 2001, Heat transfer correlation for boiling flows in small rectangular horizontal channels with low aspect ratios, Int. J. Multiphase Flow, Vol. 27, pp. 2043-2062   DOI   ScienceOn
6 Peng, X. F. and Peterson, G. P., 1996, Forced convection heat transfer of single-phase binary mixtures through microchannels, Experimental Thermal and Fluid Science, Vol. 12, pp. 98-104   DOI   ScienceOn
7 Faghri, M. and Turner, S. E., 2003, Gas flow and heat transfer in microchannels, Proc. of SAREK Summer Annual Conference, June 2-4, Muju, Korea, pp. 542-550
8 Mishima, K. and Hibiki, T., 1996, Some characteristics of air-water two-phase flow in small diameter vertical tubes, Int. J. Multiphase Flow, Vol. 22, No. 4, pp. 703-712   DOI   ScienceOn
9 Coleman, H. W. and Steele, W. G., 1989, Experimentation and uncertainty analysis for engineers, John Wiley and Sons Inc
10 Obot, N. T., 2002, Toward a better understanding of friction and heat/mass transfer in microchannels - A literature review, Microscale Thermophysical Engineering, Vol. 6, pp. 155-173   DOI
11 Tu, X. and Hrnjak, P., 2003, Experimental investigation of single-phase flow pressure drop through rectangular microchannels, 1st International Conference on Microchannels and Minichannels, April 24-25, 2003, Rochester, New York, USA
12 Wu, P. and Little, W. A., 1983, Measurement of friction factors for the flow of gases in very fine channels used for microminiature Joule- Thomson refrigerators, Cryogenics, Vol. 23, pp. 273-277   DOI   ScienceOn
13 Peng, X. F., Peterson, G. P. and Wang, B. X., 1994a, Frictional flow characteristics of water flowing through rectangular microchannels, Experimental Heat Transfer, Vol. 7, pp. 249-264   DOI   ScienceOn
14 Mala, G. M. and Li, D., 1999, Flow characteristics of water in microtubes, Int. J. Heat and Fluid Flow, Vol. 20, pp. 142-148   DOI   ScienceOn
15 Pfahler, J., Harley, J., Bau, H. H. and Zemel, J., 1990, Liquid transport in micron and submicron channels, J. Sensors and Actuators, Vol. 21, pp.431-434
16 Moriyama, K., Inoue, A. and Ohira, H., 1992, The thermohydraulic characteristics of two-phase flow in extremely narrow channels (the frictional pressure drop and void fraction of adiabatic two-component two-phase flow), Trans. JSME (Ser. 8), Vol. 58, pp. 401-407