Natural convection heat transfer from a horizontal disk in a cylindrical enclosure
Duncan, Duane Stewart Jr.
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This thesis studied natural convection in water from a horizontal mirror finished disk, heated in the center and surrounded by a cylindrical enclosure. The test section was designed to insure a one dimensional heat flux. Measurements were taken with power inputs varying from 25 to 5 watts. Fluid depth had a definite effect on the heat transfer. An apparent maximum value existed at a ratio of enclosure radius to fluid depth of one. Comparison of the data with existing correlation however, was poor which led to the questioning of the validity of the assumed one dimensional heat flux. Use of a finite element computer program demonstrated that two dimensional effects were important. Subsequent modification of the hear transfer coefficient to account for this variation gave a correlation more in agreement with those existing in the literature.
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