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MULTIPHASE FLOWS

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Broad investigations of multiphase flows including two-phase gas-liquid flows, film flows, and spray flows are in progress at the Institute.    The electrodiffusion method developed at the Institute allows one to measure the averaged and pulsation characteristics of the gas-liquid flow, such as: friction on a wall, local void fraction, velocities of liquid and gas phases, pulsation spectrums of intensity, friction, and velocity. This method is used for experimental investigations of two-phase gas-liquid flows. The turbulent structure of gas-liquid flows is being jointly studied under various conditions.

Upflow and downflow were thoroughly studied in a vertical tube as well as a flow in an inclined rectangular channel. A considerable effect of geometry and flow regime parameters on the distribution of averaged and pulsation characteristics has been revealed. The damping of friction and velocity pulsation in the near-wall area was determined for some regimes in comparison with the single-phase flow. A pseudoturbulent two-phase flow was studied at subcritical Reynolds numbers.

 Characteristics of the gas-saturated boundary layer were experimentally studied on bodies moving in liquid with high velocities. It was revealed that the bubble gas saturation of near-wall liquid layers can decrease the total hydrodynamic resistance of bodies and change their sound-emitting and sound-reflecting properties. Acoustic properties of thin near-wall and free boundary layers are being studied. The main task for the study of spray flows is the analysis of the flow structure and heat and mass transfer in the near-wall jets with fine-dispersed particles of liquid. Greatest attention is paid to the enhancement  of heat and mass transfer, and the protection of surfaces against high-temperature flows.

The hydrodynamics of thin liquid films flowing down vertical and inclined planes and over curvilinear and corrugated surfaces is being theoretically and experimentally studied. Cases of laminar, wavy, and turbulent flows are being considered. Calculation algorithms for the velocity field in two-dimension and three-dimension film flowing down a wavy wall, were developed for the first time on the basis of  Navier-Stokes equation taking into consideration  the surface tension.

 Processes of heat and mass transfer in two-phase gas-liquid flows are being investigated together with hydrodynamic characteristics of the flow. Conditions for the similarity between hydrodynamics and heat and mass transfer are being determined.

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The studying of a bubble spray flow.

The setup for studying spray flows.

Damping of turbulent pulsation in a two-phase flow.

Лебедев В.П., Терехов В.И., Шишкин Н.Е.
Массообмен при десорбции газа из мелкодиспергированных капель жидкости в пристенной двухфазной струе // ПМТФ. 1995. №3. С.122-129.

Alekseenko S.V., Nakoryakov V.E., Pokusayev B.G.
Wave flow of liquid films, Begell House, 1994, 313 p.

Kashinsky O.N., Timkin L.S., Cartellier A.
Experimental study of laminar bubbly flow in a vertical pipe // Experiments in Fluids, 1993, vol. 15, no. 4/5, p. 308-314.

Maltsev L.I.
Jet methods of gas injection into fluid boundary layer for drag reduction // Appl. Sci. Res., 1995, vol. 54, no. 4, p. 281-291.

Nakorykov V.E., Kashinsky O.N., Randin V.V., Timkin L.S.
Gas-liquid bubbly flow in vertical pipes // J. Fluids Eng., 1996, vol. 118, p. 377-382.

Kashinsky O.N., Randin V.V.
Downward bubbly gas-liquid flow in a vertical pipe. Int. J. Multiphase Flow, 1999, Vol. 25, No. 1, p. 109-138.

Terekhov V.I., Lebedev V.P., Sharov K.A., Shishkin N.E.
Transpiration cooling of surface near-wall two-phase co-current jet // The Physics of Heat Transfer in Boiling and Condensation, Intern. Symp., Moscow. 1997. P. 387-390.

   
 

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