Abstract
The heat flux q into the skin from a heated transcutaneous pO2 electrode depends on the blood flow rate in the skin. Previous studies by Jaszczak et al. have provided a model for calculating the ‘areic’ blood flow rate, i.e. the blood flow rate divided by surface area. The calculation requires measuring the heat flux with and without blood flow, q1 and q2, and knowing the core temperature under the electrode Tc. The present model provides an equation for calculating the ‘volumic’ blood flow rate, i.e. the blood flow rate divided by skin volume: where a is the thermal diffusivity of the skin (0.13 10-6 m2/s), lc is a depth parameter, and R is the ratio (q1-q2)/q2. lC, TC, and q2 are related by: q2=· (TE - TC)/lC where TE is the electrode temperature and X is the thermal conductivity of the skin (0.544 W/(m K). If standard values for lC and TC are used, measuring the heat flux after blood flow is stopped becomes superfluous.The experimental heat flux data of Jaszczak et al. measured with a special double th...
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