Effects of surface texture on flow in channels

Friction is a resistive force experienced in everyday activities due to the relative motion of two matters. It can be favorable or disadvantageous depending on the application. In many engineering applications such as fluid flow in pipes, friction is proven to be disadvantageous due to the loss of e...

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Main Author: Lim, Sherman Zheng Rui
Other Authors: Chan Weng Kong
Format: Final Year Project
Language:English
Published: 2017
Subjects:
Online Access:http://hdl.handle.net/10356/72012
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-720122023-03-04T19:18:53Z Effects of surface texture on flow in channels Lim, Sherman Zheng Rui Chan Weng Kong School of Mechanical and Aerospace Engineering DRNTU::Engineering::Mechanical engineering Friction is a resistive force experienced in everyday activities due to the relative motion of two matters. It can be favorable or disadvantageous depending on the application. In many engineering applications such as fluid flow in pipes, friction is proven to be disadvantageous due to the loss of energy and thus a reduction in efficiency. As a result, many studies have been done to reduce the frictional drag experienced when fluid flows through pipes. By altering the surface structure appropriately, the interaction between the fluid and solid surface can be modified such that the adhesion is decreased which reduces the frictional drag experienced. Studies have shown that by treating the surface of polytetrafluoroethylene, also known as Teflon, with sandpaper, frictional drag can be reduced. However, in the studies done, there lacked one which compares the effect of directional sanding on specimens treated with 2 grit designations of sandpapers. Thus, this experimental study aims to investigate the effect of surface texture by measuring the frictional drag. The frictional drag was measured by measuring the pressure drop across the specimen while keeping all other variables constant. A total of 19 specimens, including one control, were created by treating the Teflon specimens with different grit designations of sandpapers in different sanding protocols – in the flow direction and in a random motion. The results obtained from the contact angle measurements and pressure drop consistently showed that the specimens treated with both the 80 and 220 grit sandpapers achieved the best results. In addition, it can also be observed that the specimens treated in a random motion produced better results. To add on to that, the results and images obtained from the surface roughness profile and Scanning Electron Microscope respectively concurred with the above results. Bachelor of Engineering (Mechanical Engineering) 2017-05-23T07:36:20Z 2017-05-23T07:36:20Z 2017 Final Year Project (FYP) http://hdl.handle.net/10356/72012 en Nanyang Technological University 99 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::Mechanical engineering
spellingShingle DRNTU::Engineering::Mechanical engineering
Lim, Sherman Zheng Rui
Effects of surface texture on flow in channels
description Friction is a resistive force experienced in everyday activities due to the relative motion of two matters. It can be favorable or disadvantageous depending on the application. In many engineering applications such as fluid flow in pipes, friction is proven to be disadvantageous due to the loss of energy and thus a reduction in efficiency. As a result, many studies have been done to reduce the frictional drag experienced when fluid flows through pipes. By altering the surface structure appropriately, the interaction between the fluid and solid surface can be modified such that the adhesion is decreased which reduces the frictional drag experienced. Studies have shown that by treating the surface of polytetrafluoroethylene, also known as Teflon, with sandpaper, frictional drag can be reduced. However, in the studies done, there lacked one which compares the effect of directional sanding on specimens treated with 2 grit designations of sandpapers. Thus, this experimental study aims to investigate the effect of surface texture by measuring the frictional drag. The frictional drag was measured by measuring the pressure drop across the specimen while keeping all other variables constant. A total of 19 specimens, including one control, were created by treating the Teflon specimens with different grit designations of sandpapers in different sanding protocols – in the flow direction and in a random motion. The results obtained from the contact angle measurements and pressure drop consistently showed that the specimens treated with both the 80 and 220 grit sandpapers achieved the best results. In addition, it can also be observed that the specimens treated in a random motion produced better results. To add on to that, the results and images obtained from the surface roughness profile and Scanning Electron Microscope respectively concurred with the above results.
author2 Chan Weng Kong
author_facet Chan Weng Kong
Lim, Sherman Zheng Rui
format Final Year Project
author Lim, Sherman Zheng Rui
author_sort Lim, Sherman Zheng Rui
title Effects of surface texture on flow in channels
title_short Effects of surface texture on flow in channels
title_full Effects of surface texture on flow in channels
title_fullStr Effects of surface texture on flow in channels
title_full_unstemmed Effects of surface texture on flow in channels
title_sort effects of surface texture on flow in channels
publishDate 2017
url http://hdl.handle.net/10356/72012
_version_ 1759857441136181248