Air movement and heat loss from sheep. I. Boundary layer insulation of a model sheep, with and without fleece

Proceedings of the Royal Society of London. Series B, Containing Papers of a Biological Character
A J McArthur, J L Monteith

Abstract

A model sheep, made from metal cylinders and hemispheres, was heated electrically. Heat loss by forced convection in a wind tunnel was analysed in terms of the dependence of the Nusselt number (Nu) on Reynolds number (Re). For a bare trunk Nu = 0.095 Re0.684, but with fleece covering the trunk to a depth of 3.5 cm, Nu = 0.0112 Re0.875 when the mean radiative temperature of the the coat was taken as the surface temperature. Heat transfer by convection from the whole body, including legs, was described by Nu = 0.029 Re0.80. However, a bulk Nesselt number should not be used to estimate heat loss from a live sheep in a hot environment if the windspeed is below about 4 m s-1 because the relation between mean surface temperature, Nusselt number and convective heat flux is not unique.

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Citations

May 21, 1987·Journal of Theoretical Biology·A J McArthur
Apr 4, 2000·Journal of Thermal Biology·G S BakkenA F Boysen
Aug 13, 1980·Proceedings of the Royal Society of London. Series B, Containing Papers of a Biological Character·A J McArthur
Jan 1, 1996·European Journal of Applied Physiology and Occupational Physiology·M J Tipton, P J Balmi
Aug 13, 1980·Proceedings of the Royal Society of London. Series B, Containing Papers of a Biological Character·A J McArthur, J L Monteith

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Proceedings of the Royal Society of London. Series B, Containing Papers of a Biological Character
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