Natural convection heat transfer studies of simulated and actual electronic components using dielectric liquids for immersion cooling
Thompson, Ronald G. Jr.
Kelleher, Matthew D.
MetadataShow full item record
Two experimental studies of the natural convection characteristics of heated protrusions immersed in dielectric liquids were conducted. the first study used a three by three array of simulated 20 pin dual-in-line chips which were made from aluminum blocks with full heaters. The second set of experiments used a three by three array of thermal evaluation devices mounted on an alumina substrate. The devices were 8.9 mm square chips which contained resistors and a type of temperature sensing transistor. Both studies used an insulated Plexiglas enclosure with a top mounted heat exchanger maintained at a constant 10 degrees C. Each array was mounted on a Plexiglass substrate, and spacers were used to vary the horizontal distance from the components to the enclosure wall. Five separate enclosure widths were used, with a maximum spacing of 40 mm. The vertically oriented aluminum blocks were tested with FC-71 and power levels ranging from 0.115 W/chip to 2.9 W/chip. The non-dimensional data obtained was used to develop an empirical correlation which predicts Nusselt number as a function of Rayleigh number and enclosure width. The correlation was accurate to within 4% of the array averaged data, and the maximum uncertainty in the Nusselt number was 7.4%. The actual electronic components were tested with FC-71, FC-43 and FC-75. Power levels ranged from 0.34 W/chip to 1.48 W/chip. Again, the data obtained was used to develop a Nusselt number correlation. In this case a better correlation of the data was achieved using Grashof number and enclosure width. The correlation is accurate to within 2% of the array averaged data. The maximum Nusselt number uncertainty was 4.7%
Approved for public release; distribution is unlimited
Showing items related by title, author, creator and subject.
Natural convection immersion cooling of an array of vertically oriented heated protrusions in an enclosure filled with a dielectric liquid: effects of enclosure width, Prandtl number and component orientation Matthews, Scott T. (Monterey, California. Naval Postgraduate School, 1991-12);The natural convection heat transfer characteristics of a 3X3 array of vertical oriented heated protrusions, immersed in a dielectric liquid, were investigated. Aluminum blocks, 24mm x 8mm x 6mm, were used to simulate 20 ...
Flow visualization study of natural convection from a heated protrusion in a liquid filled rectangular enclosure. Knock, Rick Herman (Monterey, California. Naval Postgraduate School, 1983-12);A flow visualization study of natural convection in a liquid filled rectangular enclosure with a small heater protruding into it from one vertical wall was conducted. The top and bottom horizontal surfaces of the enclosure ...
Duncan, Duane Stewart Jr. (Monterey, California; Naval Postgraduate School, 1971-12);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. ...