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CAPITAL IN NEBRASKA AGRICULTURE: ITS FORMATION, DISTRIBUTION, AND FINANCING.
Abstract
injecting a small stream of sulfur dioxide into the center of the air stream at the base of the packing, and measuring the resulting concentration profiles at a given packing depth. Heat transfer measurements were made in a steam heated, fixed bed, heat exchanger. Radial temperature profiles were measured at several bed depths for a given flow rate by means of a modified high velocity thermocouple probe placed immediately above the packing. All nonisothermal runs were made with the tube wall temperature constant at 231°F.Radial mass transfer rates were expressed in terms of modified Peclet numbers (DpV/Eta). In the region of fully developed turbulence, corresponding to modified Reynolds numbers above 500, the Peclet numbers were essentially constant at about 12. At lower Reynolds numbers, the Peclet number decreased with flow rate. There was about a 10% difference in Peclet numbers for the two packing sizes, which was attributed to dissimilar packing orientation. The values agree with those of other investigators.In the region of fully developed turbulence, Peclet numbers measured in the presence of a temperature gradient were the same as those measured in an isothermal bed. At lower flow rates, the nonisothermal Peclet numbers were somewhat less than those for isothermal conditions. A possible explanation of the difference at low flow rates is the localized mixing caused by natural convection in the bed interstices.
Subject Area
Agricultural economics
Recommended Citation
CARLOW, LESLIE GENE, "CAPITAL IN NEBRASKA AGRICULTURE: ITS FORMATION, DISTRIBUTION, AND FINANCING." (1975). ETD collection for University of Nebraska-Lincoln. AAI7613322.
https://digitalcommons.unl.edu/dissertations/AAI7613322