Accession Number : AD0414952

Title :   EFFECTIVE THERMAL CONDUCTIVITY OF VENTILATED SNOW,

Descriptive Note : Research report

Corporate Author : COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER N H

Personal Author(s) : Yen,Yin-Chao

Report Date : FEB 1963

Pagination or Media Count : 14

Abstract : Thermal conductivities of unconsolidated snow particles with air flowing in a direction parallel but opposite to the energy flow have been investigated for the mass flow rate ranging approximately from 10 to 40 times 10 to the -4 g/sq cmsec based on the total cross-sectional area of the flask containing the snow sample. The results are interpreted as being the effective thermal conductivity of snow. In the experimental range for snow densities from 0.376 to 0.472 g/cu cm and corresponding snow particle sizes of 0.07 to 0.22 cm nominal diameter, the results can be represented well by the following leastsquares equation, k sub e = 0.0014 + 0.58 G where k sub e is the effective thermal conductivity of sknow in cal/cm-sec-C and G is the mass flow rate of dry air in g/cu cm-sec. When there is no flow, or G = 0, k sub e reduces to a constant value of 0.0014 cal/cm-sec-C, equivalent to the thermal conductivity of snow with motionless fluid. The value of 0.0014 is in good agreement with the data reported by Abel's (1893) and Kondrat'eva (1945). (Author)

Descriptors :   (*SNOW, THERMAL CONDUCTIVITY), THERMAL CONDUCTIVITY, MEASUREMENT, INSTRUMENTATION, TEMPERATURE, HEAT TRANSFER, GAS FLOW, AIR

Distribution Statement : APPROVED FOR PUBLIC RELEASE