Composition change in binary-component spray vaporization at atmospheric pressure
✍ Scribed by J. F. Culverwell; P. W. Grounds Jr.; G. G. Lamb; W. F. Stevens
- Publisher
- American Institute of Chemical Engineers
- Year
- 1956
- Tongue
- English
- Weight
- 670 KB
- Volume
- 2
- Category
- Article
- ISSN
- 0001-1541
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✦ Synopsis
Abstract
This paper describes an investigation of the factors affecting the change in composition with vaporization of a binary‐component spray in heated air at atmospheric pressure. The behavior of the system orthodichlorobenzene‐tetrachloroethylene was studied in air ranging from 400° to 1,000°F. Initial drop diameters in the sprays were in the 20‐ to 400‐µ range. The experimental data obtained indicated that the rate of change of spray composition during vaporization was affected only by the chamber‐air temperature, the initial feed composition, and the nozzle characteristics.
Equations are presented which mathematically describe the vaporization process, liquid diffusion being assumed within the drop controls. These equations have been solved by a stepwise procedure for three initial drop sizes. Results of these calculations have been added statistically according to the initial‐drop‐size distribution in order to predict the vaporization behavior of the spray. Details of this process of statistical combination have been summarized by Culverwell (1).
The calculations agreed with the experimental data previously obtained during the first 5 in. of nozzle‐to‐tray travel. After 5 in. the deviation was great. Future experimental work to determine more precise values of drop‐size distribution, initial drop velocity, and liquid diffusion coefficient may result in more complete agreement.