University of Tasmania
Browse

File(s) under permanent embargo

Determination of the surface heat-transfer coefficient in CE

journal contribution
posted on 2023-05-16, 23:22 authored by Hruska, V, Evenhuis, CJ, Rosanne Guijt, Miroslav MackaMiroslav Macka, Gas, B, Marriott, PJ, Paul HaddadPaul Haddad
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.

History

Publication title

Electrophoresis

Volume

30

Issue

5

Pagination

910-920

ISSN

0173-0835

Department/School

School of Natural Sciences

Publisher

Wiley

Place of publication

Weinheim, Germany

Rights statement

The definitive published version is available online at: http://interscience.wiley.com

Repository Status

  • Restricted

Socio-economic Objectives

Expanding knowledge in the chemical sciences

Usage metrics

    University Of Tasmania

    Exports

    RefWorks
    BibTeX
    Ref. manager
    Endnote
    DataCite
    NLM
    DC