Accession Number : ADA266615


Title :   Transient Hydrogen Heat Transfer


Descriptive Note : Final rept. Apr 1986-Apr 1989


Corporate Author : NATIONAL INST OF STANDARDS AND TECHNOLOGY BOULDER CO


Personal Author(s) : Louie, Beverly ; Steward, W G


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a266615.pdf


Report Date : 01 Aug 1990


Pagination or Media Count : 42


Abstract : The Chemical Engineering Science Division (Boulder CO) of the National Institute of Standards and Technology has investigated transient heat transfer to liquid hydrogen. Thin carbon films and Pt foils submerged in liquid hydrogen received stepped inputs of power of 1 to 42 W/ sq cm, and the onset of nucleate or film boiling was obtained for each power level. The critical heat flux was found to be approximately 8 W/sq cm, with the transition to film boiling occurring in times less than 10(exp-3). Premature film boiling can be related to the positive temperature coefficient of resistance and the narrowness of the heaters. Thermometric devices and power generation equipment selection are discussed.... Liquid hydrogen heat transfer, Nucleate boiling onset


Descriptors :   *HEAT TRANSFER , *TRANSIENTS , *LIQUID HYDROGEN , INPUT , THIN FILMS , SUBSTRATES , SOLIDS , STANDARDS , TRANSITIONS , TRANSFER , FILM BOILING , NUCLEATE BOILING , HEATERS , CHEMICAL ENGINEERING , SELECTION , CONDUCTION(HEAT TRANSFER) , TEMPERATURE COEFFICIENTS , FOILS(MATERIALS) , PLATINUM , COEFFICIENTS , CARBON , FILMS , RESISTANCE , POWER LEVELS


Subject Categories : Inorganic Chemistry
      Solid State Physics
      Thermodynamics


Distribution Statement : APPROVED FOR PUBLIC RELEASE