Settling velocity of a porous object

Stokes’ Law can be used generally to analytically determine the settling velocity of a particle of a typical regular shape such as a sphere. Such objects are also generally assumed to be homogenous in term of mass distribution. In actual situations, particles found in wastewater which are commonly c...

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Main Author: Muhammad Khalil Khaidir
Other Authors: Chiew Yee Meng
Format: Final Year Project
Language:English
Published: 2015
Subjects:
Online Access:http://hdl.handle.net/10356/64216
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-642162023-03-03T17:24:45Z Settling velocity of a porous object Muhammad Khalil Khaidir Chiew Yee Meng School of Civil and Environmental Engineering DRNTU::Engineering::Environmental engineering::Water supply DRNTU::Engineering::Environmental engineering::Water treatment DRNTU::Engineering::Civil engineering::Water resources Stokes’ Law can be used generally to analytically determine the settling velocity of a particle of a typical regular shape such as a sphere. Such objects are also generally assumed to be homogenous in term of mass distribution. In actual situations, particles found in wastewater which are commonly called flocs are porous which means that there are cavities within the particles that allow advection flow through it. The presence of porosity would therefore render Stokes’ law inadequate for calculating the terminal settling velocity for the laminar flow case. Lim (2014) experimentally determined the settling velocity of porous spheres constructed with alloy wires. The shape and size of the spheres were kept constant and only the porosity varies. The settling experiments were conducted under different fluid viscosities and a curve was plotted which relates Drag Coefficient (CD) with Reynolds Number (Re) and porosity. As a continuation of Lim’s works, different wire materials were used to construct the porous sphere in order to investigate the possible effects of material properties on its settling velocity. The materials chosen to construct the spheres are copper wire, brass wire and stainless steel wire. Two different sphere sizes of 14 mm and 18 mm were constructed to investigate the effect of different sizes on the settling velocity. The results obtained extend the CD vs. Re curve plotted by Lim to a certain extent. It is shown that the new CD vs. Re curve produced follows the same trend as the one obtained by Lim and thus confirms the reproducibility of her results. Bachelor of Engineering (Environmental Engineering) 2015-05-25T06:40:39Z 2015-05-25T06:40:39Z 2015 2015 Final Year Project (FYP) http://hdl.handle.net/10356/64216 en Nanyang Technological University 63 p. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic DRNTU::Engineering::Environmental engineering::Water supply
DRNTU::Engineering::Environmental engineering::Water treatment
DRNTU::Engineering::Civil engineering::Water resources
spellingShingle DRNTU::Engineering::Environmental engineering::Water supply
DRNTU::Engineering::Environmental engineering::Water treatment
DRNTU::Engineering::Civil engineering::Water resources
Muhammad Khalil Khaidir
Settling velocity of a porous object
description Stokes’ Law can be used generally to analytically determine the settling velocity of a particle of a typical regular shape such as a sphere. Such objects are also generally assumed to be homogenous in term of mass distribution. In actual situations, particles found in wastewater which are commonly called flocs are porous which means that there are cavities within the particles that allow advection flow through it. The presence of porosity would therefore render Stokes’ law inadequate for calculating the terminal settling velocity for the laminar flow case. Lim (2014) experimentally determined the settling velocity of porous spheres constructed with alloy wires. The shape and size of the spheres were kept constant and only the porosity varies. The settling experiments were conducted under different fluid viscosities and a curve was plotted which relates Drag Coefficient (CD) with Reynolds Number (Re) and porosity. As a continuation of Lim’s works, different wire materials were used to construct the porous sphere in order to investigate the possible effects of material properties on its settling velocity. The materials chosen to construct the spheres are copper wire, brass wire and stainless steel wire. Two different sphere sizes of 14 mm and 18 mm were constructed to investigate the effect of different sizes on the settling velocity. The results obtained extend the CD vs. Re curve plotted by Lim to a certain extent. It is shown that the new CD vs. Re curve produced follows the same trend as the one obtained by Lim and thus confirms the reproducibility of her results.
author2 Chiew Yee Meng
author_facet Chiew Yee Meng
Muhammad Khalil Khaidir
format Final Year Project
author Muhammad Khalil Khaidir
author_sort Muhammad Khalil Khaidir
title Settling velocity of a porous object
title_short Settling velocity of a porous object
title_full Settling velocity of a porous object
title_fullStr Settling velocity of a porous object
title_full_unstemmed Settling velocity of a porous object
title_sort settling velocity of a porous object
publishDate 2015
url http://hdl.handle.net/10356/64216
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