Fluid flow and heat transfer characteristics in microchannels

Over the past decade, microscale flow characteristics have been known to deviate from conventional behaviour, owing to two main effects: the electric double layer (EDL) near the solid-liquid interface, and the viscous dissipation effect. In this study, both effects on pressure-driven liquid flow in...

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Main Authors: Ang, Gabriel Pau Hwee, Toh, Kok Chuan, Ooi, Kim Tiow, Wong, Teck Neng
Other Authors: School of Mechanical and Production Engineering
Format: Research Report
Published: 2008
Subjects:
Online Access:http://hdl.handle.net/10356/6934
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Institution: Nanyang Technological University
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spelling sg-ntu-dr.10356-69342020-06-01T10:44:39Z Fluid flow and heat transfer characteristics in microchannels Ang, Gabriel Pau Hwee Toh, Kok Chuan Ooi, Kim Tiow Wong, Teck Neng School of Mechanical and Production Engineering DRNTU::Engineering::Mechanical engineering::Fluid mechanics Over the past decade, microscale flow characteristics have been known to deviate from conventional behaviour, owing to two main effects: the electric double layer (EDL) near the solid-liquid interface, and the viscous dissipation effect. In this study, both effects on pressure-driven liquid flow in a microcapillary are studied numerically and experimentally. From past reviews, it was found that viscous heating results in higher flow rate and lower friction, while EDL effect causes reduced flow and higher friction; somewhat contrary to the first?s. This analysis therefore works to study the interaction between these two effects. The results conclude that effects of EDL and viscous dissipation both affect microscale flow characteristics in different ways. The two effects are always present and contributing to the flow characteristics. However, under certain circumstances, one effect may be more significant than the other, leading the flow characteristics towards that phenomenon. Hence, the significance of each effect depends on the physical flow conditions of the fluid. 2008-09-17T14:37:26Z 2008-09-17T14:37:26Z 2005 2005 Research Report http://hdl.handle.net/10356/6934 Nanyang Technological University application/pdf
institution Nanyang Technological University
building NTU Library
country Singapore
collection DR-NTU
topic DRNTU::Engineering::Mechanical engineering::Fluid mechanics
spellingShingle DRNTU::Engineering::Mechanical engineering::Fluid mechanics
Ang, Gabriel Pau Hwee
Toh, Kok Chuan
Ooi, Kim Tiow
Wong, Teck Neng
Fluid flow and heat transfer characteristics in microchannels
description Over the past decade, microscale flow characteristics have been known to deviate from conventional behaviour, owing to two main effects: the electric double layer (EDL) near the solid-liquid interface, and the viscous dissipation effect. In this study, both effects on pressure-driven liquid flow in a microcapillary are studied numerically and experimentally. From past reviews, it was found that viscous heating results in higher flow rate and lower friction, while EDL effect causes reduced flow and higher friction; somewhat contrary to the first?s. This analysis therefore works to study the interaction between these two effects. The results conclude that effects of EDL and viscous dissipation both affect microscale flow characteristics in different ways. The two effects are always present and contributing to the flow characteristics. However, under certain circumstances, one effect may be more significant than the other, leading the flow characteristics towards that phenomenon. Hence, the significance of each effect depends on the physical flow conditions of the fluid.
author2 School of Mechanical and Production Engineering
author_facet School of Mechanical and Production Engineering
Ang, Gabriel Pau Hwee
Toh, Kok Chuan
Ooi, Kim Tiow
Wong, Teck Neng
format Research Report
author Ang, Gabriel Pau Hwee
Toh, Kok Chuan
Ooi, Kim Tiow
Wong, Teck Neng
author_sort Ang, Gabriel Pau Hwee
title Fluid flow and heat transfer characteristics in microchannels
title_short Fluid flow and heat transfer characteristics in microchannels
title_full Fluid flow and heat transfer characteristics in microchannels
title_fullStr Fluid flow and heat transfer characteristics in microchannels
title_full_unstemmed Fluid flow and heat transfer characteristics in microchannels
title_sort fluid flow and heat transfer characteristics in microchannels
publishDate 2008
url http://hdl.handle.net/10356/6934
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