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Hydrodynamika spływu cieczy dwufazowej woda - olej w rurze pionowej

Brandt A., Witczak S., Pietrzak M.

Inżynieria i Aparatura Chemiczna

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2013

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Nr 5

401--402

PL

Przeprowadzone badania umożliwiły wyznaczenie charakterystycznych wielkości dla przepływających filmów cieczy. Pozwoliły obliczyć średnie grubości występujących filmów cieczy, określić udziały objętościowe faz i dominację poszczególnych faz ciekłych w przepływie oraz wykazały, że zastosowana metoda pomiaru przewodności układu ciecz - ciecz może stanowić istotne narzędzie do identyfikacji struktur w przepływie cieczy dwufazowej.

EN

The conducted research allowed one to determine characteristic values for flowing liquid films. That made it possible to calculate the average thicknesses of occurring liquid films, determine phases void fractions and each liquid phases dominance in the flow and showed that the applied method of measuring the conductivity of liquid - liquid system can constitute an important tool to identify the structures in two-phase liquid flow.

2

Investigations on film thickness of a very viscous liquid in its flow with gas

Czernek K., Witczak S.

Turbulence : international journal

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2005

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Vol. 11

247-249

EN

The paper presents the results of tests and theoretical considerations concerning determination of the liquid film thickness under the cocurrent two-phase downward flow of gas and very viscous liquid. Influence of viscosity changes on undulation of the liquid film surface and changes of its thickness has been determined. Relationships for determination of the flowing liquid film thickness in the two-phase gas-liquid flows have been formulated.

3

Experimental investigation of a liquid film formed by impingement of an axisymmetric jet on a flat heated surface

Bykuć S.

Turbulence : international journal

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2005

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Vol. 11

235-237

EN

The aim of the present work was to study experimentally hydrodynamic and heat transfer characteristics of the flow of a liquid film over a surface. A round jet of water impinging vertically on a horizontal plane forms a thin film flowing radially until the sudden increase of depth occurs (hydraulic jump). During the experiment, the temperature of the solid surface and liquid film thickness in the suhcritical region (downstream of the hydraulic jump) and supercritical region (upstream of the hydraulic jump) were measured. Radial film thickness and Nusselt number distributions were achieved. Experiments were performed for a range of flow rates between 0.3 and 0.8 I/min. The liquid film thickness upstream of the hydraulic jump was an order of magnitude smaller than that of the subcritical region. With the growth of the flow rate, the radius of the hydraulic jump and film thickness after the jump, increased. It was found that the local Nusselt number reached maximum near the stagnation region and decreases gradually with radius as the flow moves downstream with the biggest drop corresponding to the location of hydraulic jump. Downstream of the jump, Nu was approximately uniform. Higher Nusselt numbers were reached for higher flow rates. These differences for various flow rates were much bigger in the supercritical region than that in the subcritical one.