Abo Bibliothek: Guest

ISSN Online: 2377-424X

ISBN Print: 0-89116-130-9

International Heat Transfer Conference 6
August, 7-11, 1978, Toronto, Canada

NATURAL CONVECTION IN DOUBLY INCLINED RECTANGULAR BOXES

Get access (open in a dialog) DOI: 10.1615/IHTC6.3330
pages 293-298

Abstrakt

Laminar fluid motion and heat transfer in rectangular enciosures were investigated both experimentally and computationally. One of the larger faces was maintained at a uniform high temperature and the opposing face at a uniform lower temperature. The other four faces of the enclosure were insulated. The heated surface was inclined from 0 to 180 degrees, and was also rotated about its own normal in a series of steos from 0 to 90 degrees.

The rate of heat transfer was measured for four enclosures with different aspect rations. In all cases it went through a minimum and then a maximum as the angle of inclination of the heated surface from the horizontal was increased. A significant dependence of the rate of heat transfer on the aspect ratio was observed.

A three-dimensional mathematical model for laminar natural convection was solved numericaly for a series of angles of inclination and rotation for 2×1×1 enclosure. For all conditions, the computed flow roll-cells,each made up of pairs of closed helices. The rate of heat transfer computed at finite grid sizes was extrapolated to zero grid size on the basis of prior, more detailed, two-dimensional calculations. The resulting values are in good agreement with the experimental measurements. Photographs of the streaklines in the fluid confirmed the numerical prediction of pairs of closed helices.