Masters Theses

Author

Joel G. Hall

Date of Award

12-1985

Degree Type

Thesis

Degree Name

Master of Science

Major

Biosystems Engineering

Major Professor

Robert D. von Bernuth

Committee Members

Curtis Shelton, Bruce Tschantz

Abstract

Modification of the microclimate by irrigation sprinklers involves complex interactions among thermodynamic and transfer properties, system characteristics, and ambient conditions. A need exists for a better understanding of the theoretical background of these interactions. A theoretical model which accounts for the diffusion of heat and mass in stagnant air was developed for a two-dimensional radially axi-symmetric coordinate system. The governing equations were derived by application of equations for conservation of mass and energy. The finite element method using three-node linear triangular elements and linear interpolation functions was employed to obtain numerical solutions to the governing equations. Testing of the model was performed by comparing simulated results with proven analytical solutions as well as experimental data. An example of how the model can be adapted to a specific application is included for the case of heat and mass transfer from droplets in flight. Results showed that the model accurately simulates changes in both temperature and mass concentration of water vapor in stagnant air.

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