Turbulent flow in a porous tube with wall suction.
type: CreativeWork
description: This study examines the effects of suction (i.e. lateral flow through the walls) on the structure of a fully developed turbulent pipe flow. Also the effect of suction on pressure gradient and pressure change is examined experimentally. The frictional characteristics of Irrigro$\sp{\circler,}$ the porous tubing used in this investigation, is studied by means of a comprehensive experimental program that considered different lengths of porous tubing. Three aspects of flow in porous pipes are investigated in this study, (i) a computational study of the effects of suction on the flow characteristics, (ii) an experimental study of the frictional characteristics of the porous tubing with no suction condition and (iii) an experimental study of pressure change along a porous tubing with lateral flow. The numerical study of turbulent pipe flow with wall suction rates ranging from A = 0 to 13 percent showed that in fully developed pipe flow, wall suction results in a more uniform velocity distribution with increased near-wall velocity values and reduced velocities near the centerline. The near-wall component of radial velocity, $\nu,$ increases with increasing distance from the wall in the zone near the pipe wall. The absolute levels of turbulent kinetic energy decrease with increasing suction rate. Wall suction increases the wall shear stress, $\tau\sb{\rm w},$ along the wall of the tube. The increase in $\tau\sb{\rm w}$ is significant even for the smallest suction rate (up to 30 percent) while such an increase is much higher for A = 13 percent (up to 360 percent). Analysis of the experimental friction loss data obtained for small diameter porous tubing in this study confirmed that the Colebrook and White (C-W) equation is a very accurate predictor of the friction factor for porous tubing with small diameter size and Reynolds numbers less than 100,000. These results are in agreement with the results of Aggarwal et al (1972). The value of the relative roughness obtained in thi…
abstract: This study examines the effects of suction (i.e. lateral flow through the walls) on the structure of a fully developed turbulent pipe flow. Also the effect of suction on pressure gradient and pressure change is examined experimentally. The frictional characteristics of Irrigro$\sp{\circler,}$ the porous tubing used in this investigation, is studied by means of a comprehensive experimental program that considered different lengths of porous tubing. Three aspects of flow in porous pipes are investigated in this study, (i) a computational study of the effects of suction on the flow characteristics, (ii) an experimental study of the frictional characteristics of the porous tubing with no suction condition and (iii) an experimental study of pressure change along a porous tubing with lateral flow. The numerical study of turbulent pipe flow with wall suction rates ranging from A = 0 to 13 percent showed that in fully developed pipe flow, wall suction results in a more uniform velocity distribution with increased near-wall velocity values and reduced velocities near the centerline. The near-wall component of radial velocity, $\nu,$ increases with increasing distance from the wall in the zone near the pipe wall. The absolute levels of turbulent kinetic energy decrease with increasing suction rate. Wall suction increases the wall shear stress, $\tau\sb{\rm w},$ along the wall of the tube. The increase in $\tau\sb{\rm w}$ is significant even for the smallest suction rate (up to 30 percent) while such an increase is much higher for A = 13 percent (up to 360 percent). Analysis of the experimental friction loss data obtained for small diameter porous tubing in this study confirmed that the Colebrook and White (C-W) equation is a very accurate predictor of the friction factor for porous tubing with small diameter size and Reynolds numbers less than 100,000. These results are in agreement with the results of Aggarwal et al (1972). The value of the relative roughness obtained in thi…
author: Heidarpour, Manouchehr.
keywords: Engineering, Civil.
identifier: Source: Dissertation Abstracts International, Volume: 59-07, Section: B, page: 3595.
date published: 2009-03-19T14:10:38Z
date modified: 2026-07-24T03:39:23Z
provider: University of Ottawa
publisher: Networked Digital Library of Theses and Dissertations
type: WebPage
source organization: University of Ottawa (Canada)

PropertyValue
property ID: Handle
value: http://hdl.handle.net/10393/4278

PropertyValue
property ID: DOI
value: 10.20381/ruor-10181