Enlighten
Research publications by members of the University of Glasgow
home > services > Enlighten

The effect of wind speed and wetting on thermal resistance of the barn owl (Tyto alba). I: Total heat loss, boundary layer and total resistance

McCafferty, D. (1997) The effect of wind speed and wetting on thermal resistance of the barn owl (Tyto alba). I: Total heat loss, boundary layer and total resistance. Journal of Thermal Biology, 22 (4-5). pp. 253-264. ISSN 0306-4565 (doi:10.1016/S0306-4565(97)00020-X)

Full text not currently available from Enlighten.

Publisher's URL: http://dx.doi.org/10.1016/S0306-4565(97)00020-X

Abstract

1. 1. The sensible heat loss and thermal resistance of a barn owl (Tyto alba) were determined using a heat transfer model in a wind tunnel. 2. 2. Heat loss was a linear function of wind speed and increased by 60% between 0 and 7 m s−1. Wetting the model increased heat loss by 30%. 3. 3. Boundary layer resistance of the model decreased from 223 s m−1 in still air to 56 s m−1 at a wind speed of 1.3 m s−1 and remained constant at wind speeds up to 7 m s−1. 4. 4. The relationship between Nusselt and Reynolds numbers for the model was linear, as was the relationship for cylinders over the range in Reynolds numbers. Nusselt numbers for the plumage-covered model were, however, 30% lower than those derived for the uncovered model. 5. 5. Total thermal resistance of the model was 508 s m−1 (dry) and 486 s m−1 (wet), decreasing by almost 60% from 0 to 7 m s−1. There was a nonlinear decrease in total resistance with increasing wind speed, mainly due to the change in boundary resistance between 0 and 1.3 m s−1. Author Keywords: Thermal resistance; heat loss; wind speed; wetting; barn owl; Tyto alba

Item Type:Article
Status:Published
Refereed:Yes
Glasgow Author(s):McCafferty, Dr Dominic
Authors: McCafferty, D.
College/School:College of Social Sciences > School of Education
College of Medical Veterinary and Life Sciences > School of Life Sciences > Life Sciences Animal Biology
Journal Name:Journal of Thermal Biology
ISSN:0306-4565

University Staff: Request a correction | Enlighten Editors: Update this record