2095.     LEVA, M.  Heat Transfer to Gases Flowing in Turbulent Motion Through Packed Tubes.  Ind. Eng. Chem., vol. 39, 1947, pp. 857-862; Chem. Abs., vol. 41, 1947, p. 4972.

        This has been investigated for Reynolds numbers larger than 200.  From the data obtained a dimensionally sound equation is developed, which holds very well for pipe diameters ranging from 0.622-3.1 in.  Heat-transfer coefficients were measured for air, CO₂, and N₂, and the equation holds true in all cases very satisfactorily.  h (film heat transfer coefficient) was differentiated with respect to D_p at D_t (packing diameter at tube diameter) = constant, and a maximum coefficient was predicted and experimentally verified for D_p/D_t=0.150.  The effect of the Prandtl group upon h is discussed in detail.  The effect of voids upon h was studied.  It was found that no coordinated relationship between h and voids existed.