Sensible heat transfer from the fowl: boundary-layer resistance of a model fowl.

1. The sensible heat transfer from a physical model of an adult fowl was investigated for the range of air speeds encountered in poultry houses in the United Kingdom, 0.09 to 2.7 m/s, equivalent to Reynolds numbers (Re) from 10(3) to 3 + 10(4). The Grashof number (Gr) range studied was from 6 + 10(6) to 10(7). 2. The pooled results were analysed to give a relationship between the Nusselt number (Nu) and Re in the mixed convective regime of : Nu = 2 + 0.79 Re0 48 A combination of Nu, Re and Gr did not produce a better fit to the results. 3. Enhancement of heat transfer observed when Re was close to 10(3) was probably caused by an interaction between the forced and natural air currents.