PREDICTION OF FORCED VENTILATION IN ANIMAL FUR UNDER IDEAL PRESSURE DISTRIBUTION

1. A model and computation scheme are given for predicting forced vent ilation in the fur on an animal limb or torso, modelled here as a fur- covered cylinder with the hairs erect. 2. External pressures on the fu r are predicted from potential flow theory for the outer stream, and D arcy's law is used to calculate velocities within the fur. 3. The perm eability distribution in the fur is predicted from animal data and kno wn solutions for creeping flow through regular arrays of cylinders. 4. The predicted velocities in the fur are proportional to the square of the wind speed, and will be important in modelling the transport of e nergy and moisture from mammals. 5. Predicted velocity profiles and st reamlines in the fur are presented as functions of wind speed for five mammalian species.