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Change in flow separation and velocity distribution due to effect of guide vane installed in a 90° pipe bend

Kumar Saha S., Nandi N.

Mechanics and Mechanical Engineering

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2017

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Vol. 21, nr 2

353--361

EN

Present paper makes an effort to study the flow separation and velocity distribution for incompressible turbulent flow through 90° pipe bend due to the effect of guide vane installed in the bend portion. It has been observed here how the normalized velocity distribution profile changes if the guide vane is provided. k-ɛ turbulence model has been adopted for simulation purpose. After validating with existing experimental results, a detailed study has been performed for a particular Reynolds number and four different positions of guide vane. The value of Curvature ratio (Rc/D) has been considered as 1 for present study. The results obtained from the present study have been presented in terms of graphical form. A flow separation region was found at bend outlet for flow through 90° pipe bend without guide vane. This secondary flow separation region was absent for the cases which deals with the flow through 90° pipe bend with guide vane. Velocity distribution at seven different downstream positions have been presented in graphical form. Position to get a fully developed velocity distribution profile for each cases has been estimated on the basis of presented results.

2

Mapa przepływu trójfazowego powietrze-woda-olej w luku rurowym

Pietrzak M.

Zeszyty Naukowe. Mechanika / Politechnika Opolska

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2009

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z. 93

73--74

EN

The paper presents the course and test results of hydrodynamics air-water-oil three- phase flow in pipę bend. In the paper map of three- phase flow was determined in 180° pipę bend about inside diameler 16 mm and curvature radios 110 mm

3

Badania oporów przepływu dwufazowego powietrze-olej w łuku rurowym

Pietrzak M.

Zeszyty Naukowe. Mechanika / Politechnika Opolska

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2009

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z. 94

69-70

EN

In the paper were presented results of investigations above two-phase gas-viscous liquid flow in curved channel with diameter D=0.016 m and curvature radius R=0.11 m. On the basis of investigations describe values of pressure drop of gas phase for wide spectrum of changes of dynamic viscosity of liquid phase.

4

Struktury przepływu trójfazowego gaz - ciecz - ciecz w łuku rurowym

Pietrzak M., Witczak S.

Inżynieria i Aparatura Chemiczna

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2009

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Nr 6

148-149

PL

W pracy przedstawiono wyniki badań dotyczących obserwacji struktur przepływu, jak również pomiarów udziałów objętościowych faz przy przepływie mieszaniny trójfazowej powietrze — woda — olej przez łuk rurowy. W wyniku przeprowadzonych badań zidentyfikowano formy przepływu trójfazowego, opracowano mapę takiego przepływu oraz określono wartości udziałów objętościowych powietrza.

EN

Test results of hydrodynamics of three-phase flow in a pipe bend are presented in the paper. Types of flow patterns formed in a pipe bend and values of void fractions of air were determined. A map of three-phase flow in a pipe bend was elaborated.