Accession Number : AD0427745


Title :   UNCONVENTIONAL METHODS FOR INFLUENCING FLUID FLOW. VOL. II. THE THERMOMOLECULAR EFFECT WITH APPLICATIONS TO ENERGY CONVERSION.


Descriptive Note : Final rept.


Corporate Author : CARNEGIE INST OF TECH PITTSBURGH PA


Personal Author(s) : McLennan,George Anthony


Report Date : Nov 1963


Pagination or Media Count : 85


Abstract : The phenomenon of the thermomolecular pressure rise in a gas, which occurs across a capillary material by virtue of a temperature difference, has been analyzed in several energy conversion devices which are by nature thermodynamically irreversible. Large temperature differences have been considered. The effects of heat transfer through the capillary material and a potential energy work function have been included. Three different heat engine cycles were analyzed requiring different thermodynamic processes, and the maximum efficiency determined for various imposed temperature differences, treating heat transfer and the work function separately. The efficiency of a single device was compared to that of a cascade of similar devices operating over the same temperature difference. A thermomolecular gas compressor, having no moving parts, was analyzed and the efficiency and pressure rise determined as a function of a gas flow rate, treating heat transfer, work function and imposed temperatures as parameters. A thermomolecular refrigeration cycle was considered in which a mechanically imposed gas flow results in a refrigerating effect. The minimum possible refrigerated temperature and the maximum effectiveness of this device were determined for various values of the appropriate parameters. (Author)


Descriptors :   *ENERGY CONVERSION , *FLUID FLOW , THERMODYNAMICS , GASES , REFRIGERANT COMPRESSORS , THERMIONIC CONVERTERS , HEAT TRANSFER , IRREVERSIBLE PROCESSES , WORK FUNCTIONS , REFRIGERATION SYSTEMS , TEMPERATURE


Distribution Statement : APPROVED FOR PUBLIC RELEASE