The response of turbulent pipe flow to sudden changes in wall roughness and flow cross-sectional area has been studied experimentally and numerically. Changes typical of those encountered by the gas phase in annular gas-liquid flow have been considered. The results show that the flow field and the pressure field can be significantly distorted at these transitions. Good agreement has been obtained between the measured results and those calculated using the Harwell-FLOW3D computational fluid dynamics (CFD) code.

Sreenivas Jayanti

Department Of Chemical Engineering

Calculations

Codes (symbols)

Computational fluid dynamics

Gases

Liquids

Phase Transitions

Pressure

Surface roughness

Turbulence

Two phase flow

ANNULAR FLOW

ROUGH PATCHES

Pipe flow

Pipes

Roughness

Turbulent flow

Two-phase flow

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It currently offers undergraduate, postgraduate and research degrees across 16 disciplines in Engineering, Sciences, Humanities and Management. About 596 faculty belonging to science and engineering departments and centres of the Institute are engaged in teaching, research and industrial consultancy.

IIT Madras

Turbulent flow in a pipe with intermittent rough patches: an analogue of annular two-phase flow

Chemical Engineering Communications

The response of turbulent flow to abrupt changes in pipe wall roughness is studied here. It is shown that a circumferential flow will not develop near the wall in a pipe with a short patch of circumferentially varying roughness. It is therefore concluded that the secondary flow mechanism would play no part in the liquid film distribution in horizontal annular flow.

Applied Mathematical Modelling

Response of turbulent flow to abrupt changes in surface roughness and its relevance in horizontal annular flow

Turbulence Models and Their Application in Hydraulics

Who's Who

Hutchinson of Lullington, Baron, (Jeremy Nicolas Hutchinson) (born 28 March 1915)

Boundary-Layer Theory

Extensions to the Prandtl Boundary-Layer Theory

Proceedings of the Royal Society of London. Series A: Mathematical and Physical Sciences

The prediction of turbulent flows over roughened surfaces and its application to interpretation of mechanisms of horizontal annular flow

Journal	Chemical Engineering Communications
Publisher	Gordon & Breach Science Publ Inc, Newark
ISSN	00986445
Open Access	No