Local void fraction and liquid turbulence measurements of two-phase flow downstream of a sudden expansion

• Autorzy: Ahmed W. H. , Ching C. Y. , Shoukri M.
• Języki publikacji: EN

Abstrakty

EN

The flow structure of horizontal air-oil two-phase flow downstream of a sudden area expansion has been experimentally investigated using hot-folm anemometry. The time averaged local profiles of the void fraction, mean liquid velocity and the liquid turbulence intensity for elongated bubble flow downstream of the expansion are presented in this paper. The development of the flow pattern downstream of the expansion was investigated using dorect observations of the flow using a high speed video camera. The sudden expansion was found to have a strong effect on the phase redistribution immediately downstream of the expansion. However, the "fully developed" flow regime and void fraction are found to be dependent only on the downstream flow parameters.

Słowa kluczowe

EN

two-phase flow; sudden expansion; void fraction; turbulence

PL

przepływ dwufazowy; gwałtowne rozprzestrzenianie; turbulencje

• Wydawca: Wydawnictwo Instytutu Maszyn Przepływowych PAN
• Czasopismo: Transactions of the Institute of Fluid-Flow Machinery
• Rocznik: 2006
• Tom: nr 118
• Strony: 3--14
• Opis fizyczny: Bibliogr. 10 poz., rys.

Twórcy

autor

Ahmed W. H.

autor

Ching C. Y.

autor

Shoukri M.

• Dept. of Mechanical Engineering, Mc Master University, 1280 Main Str. West, Hamilton, Ontario, L8S 4L8, Canada,

Bibliografia

• [1] Aloui F., Doubliez L., Legarand J., and Souhar M.: Bubbly flow in an axi- symmetric sudden expansion: Pressure drop, void fraction, wall shear stress, bubble velocities and sizes, J. Exp. Thermal and Fluid Sci., 19, 1999, 118-130.
• [2] Rinne A. and Loth R.: Development of local two-phase flow parameters for vertical bubbly flow in a pipe with sudden expansion, Experimental Thermal and Fluid Science, 13, No. 2, 1996, 152-166.
• [3] Bel-Fdhila R., Suzanne C., and Masbernat L.: Measurements in Two-Phase Bubbly Flows in Complex Geometries. In Phase-Interface Phenomena In Multi-Phase Flow, (Hewitt, G. F., Mayinger, F. and Riznic, J. R. Eds.), Hemisphere Publishing Corporation, 1991.
• [4] Aloui F. and Souhar M.: Experimental study of a two-phase bubbly flow in a flat duct symmetric sudden expansion-part I I, visualization, pressure and void fraction, Int. J. Multiphase Flow, 22, No. 4, 1996.
• [5] Aloui F. and Souhar M.: Experimental study of a two-phase bubbly flow in a flat duct symmetric sudden expansion part II, liquid and bubble velocities, bubble sizes, Int. J. Multiphase Flow, 22, No. 5, 1996.
• [6] Yang Y., Li G., Zhou F., and Chen X.: Flow pattern and their transition characteristics of the air-water two-phase flow in a horizontal pipe with sudden changed cross section area, Nuclear Science and Techniques, 12, No. 1, 2001, 44-52.
• [7] Ahmed W. H., Ching C. Y., and Shoukri M.: Pressure recovery of oil two- phase flow across sudden expansions, In CSME Forum, Kingston Ontario, Canada, CD Proceedings, 2001.
• [8] Ahmed W.H.: Two-Phase Flow Through Sudden Area Expansions, PhD thesis, McMaster University, Hamilton, Ontario, Canada, 2005.
• [9] Butterworth D.: A comparison of some void-fraction relationship for cocurrent gas-liquid flow, Int. J. Multiphase Flow, 1, 1975, 845-850.
• [10] Taitel Y. and Dukler A. E.: A model for predicting flow regime transitions in horizontal and near horizontal gas-liquid flow, AIChE J., 22, 1976. 47-55.