Principles of Animal Biometeorology by Roberto Gomes da Silva & Alex Sandro Campos Maia

Author:Roberto Gomes da Silva & Alex Sandro Campos Maia
Language: eng
Format: epub
Publisher: Springer Netherlands, Dordrecht

4.1.3 Thermal Exchange at the Body Surface

4.1.3.1 Skin Surface

Thermal Insulation

Thermal insulation is defined as the inverse of conductivity, which can have values from 0.410 to 0.426 W m−2 °C−1 for cattle (Holmes 1998). It depends on the blood flux at the surface; for example, the temperature at the surface of a rabbit’s ear increases rapidly from 15 to 35°C as the deep body temperature increases from 39.5 to 40°C; then it becomes stabilised, despite a subsequent increase of the body temperature to 42.5°C (Eckert et al. 1988). Such an increase of the cutaneous temperature is due to an increased blood flow after a dilatation of the capillary vases at the surface.

The increased blood flow from the inner body results into a greater thermal energy transfer to the body surface. In other words, tissue thermal insulation is reduced with vasodilatation and increased with vasoconstriction.

Sensible heat exchanges through the body surface tissues can be described by the formula

Download

Copyright Disclaimer:
This site does not store any files on its server. We only index and link to content provided by other sites. Please contact the content providers to delete copyright contents if any and email us, we'll remove relevant links or contents immediately.