Accession Number : ADA292232

Title :   Micro/Miniature Heat Pipe Analysis.

Descriptive Note : Interim rept. Jun 92-Dec 93,

Corporate Author : WRIGHT STATE UNIV DAYTON OH DEPT OF MECHANICAL AND MATERIALS ENGINEERING

Personal Author(s) : Faghri, Amir ; Khrustalev, Dmitry

PDF Url : ADA292232

Report Date : JUL 1994

Pagination or Media Count : 175

Abstract : Analysis presented in this report shows that longitudinal groove designs are crucial to increase the heat transport capacity of miniature heat pipes. Furthermore vapor continuum limitation for a micro heat pipe operation is also defined and presented. The steady-state mathematical models of a micro heat pipe operation and miniature axially-grooved heat pipe are developed where the importance of the interfacial phenomena at the surfaces of the ultra-thin films is emphasized. The predicted capillary and boiling limitations as well as the thermal resistances are compared to existing experimental data on micro, miniature and conventional axially-grooved heat pipes. It is found that flat miniature heat pipes are easily capable of withstanding heat fluxes on the order of 40 w/ sq cm on the evaporator wall. jg

Descriptors :   *MINIATURIZATION, *HEAT PIPES, THERMAL PROPERTIES, HEAT TRANSFER, MATHEMATICAL MODELS, STEADY STATE, EXPERIMENTAL DATA, INTERFACES, VAPORS, RESISTANCE, THIN FILMS, SURFACES, LIMITATIONS, OPERATION, WALLS, HEAT FLUX, GROOVING, SPECIFIC HEAT, CAPILLARITY, EVAPORATORS, AXIAL FLOW, BOILING.

Subject Categories : Thermodynamics
      Pumps, Filters, Pipes, Tubing, Fittings & Vlvs

Distribution Statement : APPROVED FOR PUBLIC RELEASE