2103.     LEVA, M., WEINTRAUB, M., GRUMMER, M., AND CLARKE, E. L.  Cooling of Gases Flowing in Turbulent Motion Through Packed Tubes.  Ind. Eng. Chem., vol. 40, 1948, pp. 747-752; Chem. Abs., vol. 42, 1948, p. 5277.

        Heat-transfer coefficients were determined for the flow of heat from hot air and CO₂ to cooling water.  Tests were made with a 2-in. and a ¾-in. standard packed tube.  The packing material was of low thermal conductivity, spherical, and smooth.  The ratio D_p:D_t varied from about 0.08-0.27.  The gas-flow range was characterized by the modified Reynold’s number interval 250-3,000.  2 dimensionally homogeneous equations were proposed correlating h (heat-transfer coefficient) and the physical properties of the system.  The coefficient of the 1^st equation was differentiated with respect to D_p at D_t (packing diameter at tube diameter) and G=constant, and a maximum heat transfer coefficient was predicted for D_p:D_t=0.153 and verified experimentally. The heat-transfer coefficient was determined for CO₂ and correlated with that for air; the check between the two was excellent.  The possible inclusion of the Prandtl number is discussed as well as the application of the equations to tube sizes larger than 2 in.