Heat exchange of dynamic powder beds with a heat-transfer surface. II. A dust-laden gas flow

Heat exchange of a dust-laden gas flow with the wall of a cylindrical channel in laminar and laminar-to-turbulent transitional regimes of gaseous-phase motion is studied experimentally. Corundum with a particle size of 40 μm was used as the solid phase while air was used as the carrier gas. Experimental values of the heat-transfer coefficient are obtained and approximate dependences for the Nu number are proposed.     

Measurement of Gage Blocks on a Kosters Interferometer

Computational modeling has been employed to study how the uncertainty in the estimate of a fractional part of an interference order affects the results of gage block measurements with a Kosters interferometer at different values of the standard uncertainty for the fractional-order measurements. The statistical characteristics of the standard uncertainty of the distribution function for deviations of the measured results from the true value have been estimated at different values of the standard uncertainty of the fractional-order measurements.     

Measurement of Nb3Ge heat capacity

The heat capacity of massive Nb₃Ge specimens (cast, annealed, and rapidly quenched) is measured by the adiabatic calorimetry method with periodic heat supply over the temperature range 5–30°K. Measurements and data collection were completely automated.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 41, No. 6, pp. 1073–1077, December, 1981.