Evolution of flow patterns, gas fraction profiles and bubble size distributions in gas-liquid flows in vertical tubes

• Autorzy: Lucas D. , Krepper E. , Prasser H. M.
• Języki publikacji: EN

Abstrakty

EN

Air-water flow at ambient conditions in a vertical pipe an inner diameter of 51.2 mm is investigated. An electrode wire-mesh sensor enables the measurement of the phase distribution with a very high resolution in space and in time. Local bubble size distributions are calculated from the data. The measurements were done in distances from the gas injection device. As a result, the development of bubble size distributions as well as the development of the radial gas fraction profiles can be studiet. It was found, that the bubble size distribution as well as local effects determine the transistion from bubble flow. The data are used for the development of a model, which predicts the development of the bubble size distribution and the transition from bubble flow in the case of stationary flow in a vertical pipe.

Słowa kluczowe

EN

two-phase flow; flow pattern transition; bubble flow; slug flow

• Wydawca: Wydawnictwo Instytutu Maszyn Przepływowych PAN
• Czasopismo: Transactions of the Institute of Fluid-Flow Machinery
• Rocznik: 2003
• Tom: nr 112
• Strony: 37--46
• Opis fizyczny: Bibliogr. 7 poz., rys.

Twórcy

autor

Lucas D.

• Forschungszentrum Rossendorf e.V., Institute of Safety Research, Dresden, Germany

autor

Krepper E.

• Forschungszentrum Rossendorf e.V., Institute of Safety Research, Dresden, Germany

autor

Prasser H. M.

• Forschungszentrum Rossendorf e.V., Institute of Safety Research, Dresden, Germany

Bibliografia

• 1.Tomiyama A.: Struggle with computational bubbte dynamics,3th Int. Conf. on Multiphase Flow,ICMF'98, Lyon, France, June B-12, 1998
• 2. Prasser H.-M,, Krepper E., Lucas D.: Euolution of the two-phase flow in a vertical tube - decomposition of gas fraction profiles according to bubble size classes using wire-mesh sensors, Int. J, of Thermal Sci,, 41(2002), 17-28
• 3. Prasser H.-M., Bottger A., Zschau J,: A new electrode-mesh tomograph for gas-liquid, flows, Flow Measurement and Instrumentation 9(1998), 111-119
• 4. Prasser H.-M., Scholz D., Zippe C.: Bubble Size Measurement using WireMesh Sensors, Flow Measurement and Instrumentation, FIow Measurement and Instrumentation, 12(2001), 299-312
• 5. Taitel, Y., Bornea D., Dukler A.E.: Modelling Flow Pattern Transitions for Steady Upward Gas-Liquid Flow in Vertical Tubes, AIChE Journal, 26(1980), 345-354.
• 6. Lucas D., Krepper E., Prasser H.-M.: Deuelopment of bubble size distributions in vertical pipe flow by consideration of radial gas fraction profiles, 4th Int. Conf. ot Multiphase Flow, New Orleans, May Z7-Jlne 1, 2001, Conf.- CD, Paper 378.
• 7. Lucas D., Krepper E., Prasser H.-M.: Predlctźon of ratlial gas profiles in ventical pipe flow on basis of the bubble size distribution,InŁ. J. of Thermal Sci. 40(2001), 217-225,