An Experimental Study of Natural Convection in Trapezoidal Enclosures

[+] Author and Article Information
L. Iyican, L. C. Witte

Department of Mechanical Engineering, University of Houston, Houston, TX 77004

Y. Bayazitoǧlu

Department of Mechanical Engineering and Materials Science, Rice University, Houston, TX 77001

J. Heat Transfer 102(4), 648-653 (Nov 01, 1980) (6 pages) doi:10.1115/1.3244366 History: Received October 15, 1979; Online October 20, 2009


Experimental data for natural convection of air in an inclined trapezoidal enclosure are reported for a Rayleigh number range of ∼ 2 × 103 to ∼ 5 × 107 . The small side of the trapezoid was electrically heated while the opposing large side was cooled to a uniform temperature. The effect of tilt angle from 0 to 90 deg (from horizontal) was investigated at 15 deg increments. Data were also obtained for 180 deg (hot surface facing down). A comparison of the data to an analysis using a two-dimensional circulation pattern showed reasonable agreement in the Rayleigh number-tilt angle range where two-dimensional circulation could be expected. The experimental data are correlated by an equation of the form, Nu = C Ran , over a wide Rayleigh number range. The data exhibit a local minimum in the Nusselt number-tilt angle curve between 90 and 0 deg in a manner similar to that observed in inclined rectangular channels.

Copyright © 1980 by ASME
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