Accession Number : ADA263496


Title :   Pulse Mitigation and Heat Transfer Enhancement Techniques. Volume 3. Liquid Sodium Heat Transfer Facility and Transient Response of Sodium Heat Pipe to Pulse Forward and Reverse Heat Load.


Descriptive Note : Final rept. 1 Jul 1987-31 Jul 1992,


Corporate Author : KENTUCKY UNIV LEXINGTON DEPT OF MECHANICAL ENGINEERING


Personal Author(s) : Chow, L C ; Hahn, O J ; Nguyen, H X


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a263496.pdf


Report Date : Aug 1992


Pagination or Media Count : 97


Abstract : This report presents the description of a liquid sodium heat transfer facility (sodium loop) constructed to support the study of transient response of heat pipes. The facility, consisting of the loop itself, a safety system, and a data acquisition system, can be safely operated over a wide range of temperature and sodium flow rate. The transient response of heat pipe to pulse heat load at the condenser section was experimentally investigated. A 0.457 m (18 ) long, screen wick, sodium heat pipe with 0.0127 m (0.5 ) outer diameter was tested under different heat loading conditions. Major finding was that the heat pipe reversed under a pulse heat load applied at the condenser. The time of reversal was approximately 15 to 25 seconds. The startup of heat pipe from frozen state was also studied. It was found that during startup process, at least part of the heat pipe was active. The active region extended gradually down to the end of the condenser until all working fluid in the heat pipe was molten.


Descriptors :   *HEAT TRANSFER , *SODIUM , *PULSES , *LIQUID METALS , *HEAT PIPES , THERMAL PROPERTIES , TRANSIENTS , DIAMETERS , TEMPERATURE , COOLING , RESPONSE , ALKALI METAL COMPOUNDS , ELECTROMAGNETIC PUMPS , LOOPS , SPACE FLIGHT , TRANSFER , FILTERS , FLUIDS , DATA ACQUISITION , SAFETY , FLOW RATE , REGIONS , HEAT EXCHANGERS , FORWARD AREAS , THERMODYNAMICS , FACILITIES , RATES


Subject Categories : Inorganic Chemistry
      Physical Chemistry
      Thermodynamics


Distribution Statement : APPROVED FOR PUBLIC RELEASE