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Determination of the surface heat-transfer coefficient in CE


Hruska, V and Evenhuis, CJ and Guijt, RM and Macka, M and Gas, B and Marriott, PJ and Haddad, PR, Determination of the surface heat-transfer coefficient in CE, Electrophoresis, 30, (5) pp. 910-920. ISSN 0173-0835 (2009) [Refereed Article]

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DOI: doi:10.1002/elps.200800647


A knowledge of the heat-transfer coefficient, hs, for the external surface of the capillary or the overall heat coefficient, hOA, is of great value in predicting the mean increase in temperature of the electrolyte, TMean, during electrokinetic separations. For CE, traditional indirect methods of determining hs were time-consuming and tended to overestimate cooling efficiency; a novel method is introduced, which is based on curve-fitting of plots of conductance versus voltage to calculate several important parameters including TMean, hs, the conductance free of Joule heating effects (G0) and the voltage that causes autothermal runaway, Vlim. The new method is superior to previously published methods in that it can be performed more quickly and that it corrects for systematic errors in the measurement of electric current for voltages <5 kV. These errors tended to exaggerate the cooling efficiency of commercial instruments so that the calculated increases in electrolyte temperature were smaller than their actual values. Axially averaged values for hs were determined for three different commercial CE instruments ranging from 164 W m-2 K-1 for a passively cooled instrument in a drafty environment to 460 W m-2 K-1 for a liquid-cooled instrument.

Item Details

Item Type:Refereed Article
Keywords:Autothermal parameter Curve fitting Limiting voltage Surface heat-transfer coefficient Temperature
Research Division:Chemical Sciences
Research Group:Analytical chemistry
Research Field:Separation science
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the chemical sciences
UTAS Author:Evenhuis, CJ (Dr Christopher Evenhuis)
UTAS Author:Guijt, RM (Dr Rosanne Guijt)
UTAS Author:Macka, M (Professor Mirek Macka)
UTAS Author:Haddad, PR (Professor Paul Haddad)
ID Code:55958
Year Published:2009
Web of Science® Times Cited:8
Deposited By:Austn Centre for Research in Separation Science
Deposited On:2009-03-16
Last Modified:2015-02-07

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