CFD of turbulent stream around a 90deg bend Article

Process of the Institution of Physical

Engineers, Portion C: Diary of Physical

Engineering Research

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A report of Violent Flows in Pipe Bends

W D Al-Rafai, Y D Tridimas and D H Woolley

Proceedings from the Institution of Mechanical Technical engineers, Part C: Journal of Mechanical Architectural Science 1990 204: 399

DOI: 10. 1243/PIME_PROC_1990_204_120_02

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399

A study of violent flows in pipe bends

W And Al-Rafai, BEng, AMIMechE, Sumado a D Tridimas, BSc, MUM, PhD and N They would Woolley, BSc, MSc, PhD School of Engineering and Technology Managing, Liverpool Polytechnic An trial and error and numerical study oj turbulent air-flow in rounded section water line bends was carried out in order to determine the f

effect o bend curvature upon theflow.

Two bends had been used, with inside diameters o 43 mm and curvature ratios o 1: 13. ninety five and I: six. 98. The corresponding Dean amounts f

farreneheit

were 9138 and doze 919. The Reynolds amount for both equally cases was 34 132. Measurements um mean streamwise and l. m. s i9000. velocities were made using laser beam Doppler anemmetry. Numerical modeling was based on f

the commercial pc package 'PHOENICS', employing a k-& turbulence version, standard wall structure functions and a 3d elliptic option procedure.

The results confirmed that the extra p u w while more prevalent in the smaller flex. In view u certain simplifyins assumptions inside the f

theoretical model, motivating agreement among experimental results and statistical predictions was obtained.

MENTION

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r*

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ri

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Professional indemnity

0. farrenheit

1

01, f

4i

turbulence style constants

Leader number

Doppler frequency

violent kinetic energy

probability denseness function

gigantic coordinate

tube radius, channel half-width

normalized radial put together

pipe or perhaps channel fold radius of curvature

phase volume small percentage

flow Reynolds number

smooth bulk velocity

scatterer velocity normal to fringes

velocity vector of phase i

mean streamwise velocity

normalized mean stream velocity

cross-stream synchronize

normalized cross-stream coordinate

fold angle

curvity ratio = rl/rc

diffusion rate of turbulent kinetic energy

viewpoint between beams

laser wavelength

fluid adelgazar kinematic viscosity

fluid turbulent kinematic viscosity

fluid density

phase density

laminar Prandtl number = 1

thrashing Prandtl number = you

any kept property of phase i

you INTRODUCTION

Research of runs in water pipe bends can easily play a major

role in improving the appearance of commercial products

and the understanding of the heat-transfer rate

happening in different water pipe bends. Enayet et ing. (1)

carried out a study in laminar and turbulent circulation round

a 90" tube bend which has a curvature percentage of 1: a few. 6. The

results to get laminar stream revealed more powerful secondary

sentencia in the axial velocity profiles than those

The M S i9000 was received on I March 1990 and was accepted intended for publication about 27 This summer 1990.

[email protected] IMechE 1990

0954-4062/90

seen by Agrawal et approach. (2). The singer et ing. (3)reported

measurements in a 90" square-section fold with a curvature ratio of just one: 4. 6th and two Reynolds...

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