Heat and Mass Transfer Research Journal (HMTRJ)

Research Article

Sublimating Paradichlorobenzene Cylinders Oriented Horizontally in a Natural Convection Environment

Karyn Bautista, William S. Janna and Jeff Marchetta

University of Memphis, Memphis, TN, USA

Submitted: November 15, 2016; Revised: January 19, 2017; Accepted: February 21, 2017

Abstract

Solid paradichlorobenzene pellets were melted and cast into cylinders. Each cylinder was then suspended horizontally and allowed to sublimate in air. Data on mass loss versus time were collected, and a sublimation rate was determined. The cylinder diameters were: 1 in. (2.54 cm), 1.5 in. (3.81 cm), and 2 in. (5.08 cm). The length of all cylinders was 10 in. (25.4 cm). Results of calculations made indicate that the Schmidt number was constant. The Sherwood number ranged from 4.7 to 21, while Rayleigh numbers ranged 14 x 103 to 113 x 103. The objective of this study was to derive an empirical equation for determining the mass transfer coefficient of horizontally suspended paradichlorobenzene cylinders that sublimated in a natural convection environment. An equation relating Sherwood and Rayleigh numbers was derived. For cylinder diameters ranging from 1 in (2.54 cm) to 2 in (5.08 cm), the results of this study indicate that the equation Sh = 2 ×10-4·Ra + 2.385 correlates the data well, with R2 = 0.9999.

Keywords

Heat transfer; Mass transfer; Sublimation; Paradichlorobenzene.

Downlaod Full Text >>