Process of the Institution of Physical
Engineers, Portion C: Diary of Physical
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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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
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.
p. m. f.
turbulence style constants
violent kinetic energy
probability denseness function
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
normalized cross-stream coordinate
curvity ratio = rl/rc
diffusion rate of turbulent kinetic energy
viewpoint between beams
fluid adelgazar kinematic viscosity
fluid turbulent kinematic viscosity
laminar Prandtl number = 1
thrashing Prandtl number = you
any kept property of phase i
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
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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