Sublimation of vertically oriented paradichlorobenzene cylinders in a natural convection environment

Paradichlorobenzene cylinders were cast, then suspended vertically and allowed to sublimate in air. Data on mass versus time were measured, and a sublimation rate was calculated. Three cylinders of different diameters were used: 1 inch (2.54?cm), 1.5 inch (3.81?cm), and 2 inch (5.08?cm). The length of all three cylinders was 10 in. (25.4?cm). Calculations indicate that the Schmidt number was constant. The Sherwood number ranged from 23 to 26, and Rayleigh numbers varied from 11?×?10³ to 88?×?10³. The objective of this study was to develop a correlation for determining the mass transfer coefficient of vertically suspended paradichlorobenzene cylinders in a natural convection environment. An equation relating Sherwood and Rayleigh numbers was derived.