Joule heating induced heat transfer for electroosmotic flow of power-law fluids in a microcapillary

Capillary electrophoresis systems mainly used for chemical analyses and biomedical diagnoses usually involve biofluids in electrolyte buffers which cannot be treated as Newtonian fluids. In addition, the presence of Joule heating can limit the performance of capillary electrophoresis systems. This s...

Full description

Saved in:
Bibliographic Details
Main Authors: Zhao, Cunlu, Yang, Chun
Other Authors: School of Mechanical and Aerospace Engineering
Format: Article
Language:English
Published: 2013
Subjects:
Online Access:https://hdl.handle.net/10356/100051
http://hdl.handle.net/10220/13577
Tags: Add Tag
No Tags, Be the first to tag this record!
Institution: Nanyang Technological University
Language: English
id sg-ntu-dr.10356-100051
record_format dspace
spelling sg-ntu-dr.10356-1000512020-03-07T13:19:20Z Joule heating induced heat transfer for electroosmotic flow of power-law fluids in a microcapillary Zhao, Cunlu Yang, Chun School of Mechanical and Aerospace Engineering DRNTU::Engineering::Mechanical engineering Capillary electrophoresis systems mainly used for chemical analyses and biomedical diagnoses usually involve biofluids in electrolyte buffers which cannot be treated as Newtonian fluids. In addition, the presence of Joule heating can limit the performance of capillary electrophoresis systems. This study presents a detailed analysis of Joule heating induced heat transfer for electroosmotic flow (EOF) of power-law fluids in a microcapillary. The steady, fully developed EOF field of power-law fluids governed by the Cauchy momentum equation is solved analytically by using two approximate schemes for modified Bessel functions, I0(x) and I1(x). Subsequently, under the widely accepted assumption of thin electric double layer (EDL) in microfluidics, an exact solution for temperature field induced by Joule heating is analytically solved from the energy equation subject to a mixed thermal boundary condition outside the capillary. Closed form expressions are obtained for the two-dimensional temperature field, the average fluid temperature and the local Nusselt number in both thermally developing and thermally developed regions. It is found that the rheological properties of power-law fluids affect the heat transfer characteristics mainly through the thermal Peclet number. 2013-09-20T07:46:40Z 2019-12-06T20:15:47Z 2013-09-20T07:46:40Z 2019-12-06T20:15:47Z 2012 2012 Journal Article Zhao, C., & Yang, C. (2012). Joule heating induced heat transfer for electroosmotic flow of power-law fluids in a microcapillary. International journal of heat and mass transfer, 55(7-8), 2044–2051. https://hdl.handle.net/10356/100051 http://hdl.handle.net/10220/13577 10.1016/j.ijheatmasstransfer.2011.12.005 en International journal of heat and mass transfer
institution Nanyang Technological University
building NTU Library
country Singapore
collection DR-NTU
language English
topic DRNTU::Engineering::Mechanical engineering
spellingShingle DRNTU::Engineering::Mechanical engineering
Zhao, Cunlu
Yang, Chun
Joule heating induced heat transfer for electroosmotic flow of power-law fluids in a microcapillary
description Capillary electrophoresis systems mainly used for chemical analyses and biomedical diagnoses usually involve biofluids in electrolyte buffers which cannot be treated as Newtonian fluids. In addition, the presence of Joule heating can limit the performance of capillary electrophoresis systems. This study presents a detailed analysis of Joule heating induced heat transfer for electroosmotic flow (EOF) of power-law fluids in a microcapillary. The steady, fully developed EOF field of power-law fluids governed by the Cauchy momentum equation is solved analytically by using two approximate schemes for modified Bessel functions, I0(x) and I1(x). Subsequently, under the widely accepted assumption of thin electric double layer (EDL) in microfluidics, an exact solution for temperature field induced by Joule heating is analytically solved from the energy equation subject to a mixed thermal boundary condition outside the capillary. Closed form expressions are obtained for the two-dimensional temperature field, the average fluid temperature and the local Nusselt number in both thermally developing and thermally developed regions. It is found that the rheological properties of power-law fluids affect the heat transfer characteristics mainly through the thermal Peclet number.
author2 School of Mechanical and Aerospace Engineering
author_facet School of Mechanical and Aerospace Engineering
Zhao, Cunlu
Yang, Chun
format Article
author Zhao, Cunlu
Yang, Chun
author_sort Zhao, Cunlu
title Joule heating induced heat transfer for electroosmotic flow of power-law fluids in a microcapillary
title_short Joule heating induced heat transfer for electroosmotic flow of power-law fluids in a microcapillary
title_full Joule heating induced heat transfer for electroosmotic flow of power-law fluids in a microcapillary
title_fullStr Joule heating induced heat transfer for electroosmotic flow of power-law fluids in a microcapillary
title_full_unstemmed Joule heating induced heat transfer for electroosmotic flow of power-law fluids in a microcapillary
title_sort joule heating induced heat transfer for electroosmotic flow of power-law fluids in a microcapillary
publishDate 2013
url https://hdl.handle.net/10356/100051
http://hdl.handle.net/10220/13577
_version_ 1681041303351066624