Effects of horizontal and vertical spacers on the heat transfer across a horizontal, annular, air-filled cavity

M.J. Shilston and S.D. Probert

Applied Energy, 1978, vol. 4, issue 1, 37 pages

Abstract: Flow patterns and temperature profiles, as well as local and overall heat transfer coefficients, were measured for a horizontal, annular cavity, containing air at atmospheric pressure. The radius ratio of the bounding surfaces of the cavity was 1·5, the inner cylinder being heated. The insertion of two horizontal, radial, co-planar spacers bridging the 18·9 mm cavity along its whole length, reduced the convective rate of heat transfer from the surface of the inner cylinder whereas the same co-planar spacers, if vertical, led to an increased rate of convective heat transfer. Flow instabilities, encountered in the plain cavity, were also eliminated by the insertion of the horizontal spacers.

Date: 1978
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