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Determination of the surface heat-transfer coefficient in CE
Citation
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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Copyright Statement
The definitive published version is available online at: http://interscience.wiley.com
Official URL: http://interscience.wiley.com
DOI: doi:10.1002/elps.200800647
Abstract
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 |
| Author: | Evenhuis, CJ (Dr Christopher Evenhuis) |
| Author: | Guijt, RM (Dr Rosanne Guijt) |
| Author: | Macka, M (Professor Mirek Macka) |
| 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 |
| Downloads: | 0 |
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