Accession Number : ADA309663

Title :   Fundamental Studies in Cryogenic Cooling of Power Electronics.

Descriptive Note : Interim rept. 1 Sep 94-31 Aug 95,

Corporate Author : KENTUCKY UNIV LEXINGTON DEPT OF MECHANICAL ENGINEERING

Personal Author(s) : Chow, L. C. ; Lu, W. F. ; Hahn, O. J. ; Sehmbey, M. S. ; Chui, C. J.

PDF Url : ADA309663

Report Date : SEP 1995

Pagination or Media Count : 57

Abstract : This report is divided into three different studies. The first study deals with the critical heat flux in spray cooling. A new correlation is derived based on the macrolayer dry-out model for critical heat flux. This correlation is shown to have very good agreement with available data for different forms of spray cooling. The second study deals with the heat transfer characteristics of a vertical array of heaters in a confined space in liquid nitrogen. Experiments were conducted to study the behavior of flush mounted heaters in a vertical array with limited space in front. The results show the effect of heater position, heater length, and the spacing in front of the heaters. The last part deals with flow boiling of liquid nitrogen from discrete heat sources in a rectangular channel. An experimental apparatus has been designed and fabricated to study the effect of various geometrical parameters in flow boiling from discrete heat sources.

Descriptors :   *SUPERCONDUCTORS, *COOLING, *METAL OXIDE SEMICONDUCTORS, *HEAT FLUX, *CRYOGENICS, *HEATERS, HEAT TRANSFER, ELECTRONIC EQUIPMENT, POWER EQUIPMENT, LIQUID NITROGEN, DRYING, BOILING.

Subject Categories : Electrical and Electronic Equipment
      Air Condition, Heating, Lighting & Ventilating
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE