No description available.

With the increasing demands on water for agricultural, domestic and industrial purposes, water conservation has become an essential feature of our economy in Western Canada. Water conservation has been under study for many years, and research workers have been experimenting with various conservation methods. Lately, the use of monomolecular films has shown great promise in providing an economical means for retarding the rate of evaporation from water surfaces. This study was undertaken to test the effectiveness of cetyl alcohol films in retarding the rate of evaporation from free water surfaces. Four circular tanks were installed at the Summer-land Experimental Station and the rate of evaporation was recorded daily for each one of these tanks. The study was carried out during the summer of 1958. Varying quantities of cetyl alcohol were added to the water surface and their effect on the rate of evaporation was recorded. Besides recording the rate of evaporation, other meteorological information was also collected and used in evaluating and in interpreting the experimental results. It became evident from the experimental results that a twenty to thirty per cent retardation in the rate of evaporation can be achieved with the use of cetyl alcohol films. / Applied Science, Faculty of / Chemical and Biological Engineering, Department of / Graduate

The purpose of this work is to demonstrate the usability of irreversible thermodynamics and kinetic theory in describing slow steady state evaporation and condensation, analyze the statistical rate theory (SRT) approach, and investigate the physical phenomena involved. Recently large interface temperature jumps have been observed during steady state evaporation and condensation experiments; the vapor interface temperature was greater than the liquid interface temperature for condensation and evaporation. To predict the temperature jump, the SRT mass flux was introduced as an alternative to the established approaches of irreversible thermodynamics and kinetic theory of gases. Simple one dimensional planar and spherical models were developed for slow evaporation and condensation based on the experiments. We considered pure liquid water evaporation and condensation to, and from its own vapor. Expressions for the mass and energy fluxes across the interface were found using irreversible thermodynamics, kinetic theory, and SRT. The SRT theory does not have an energy flux expression, as a substitute we use the irreversible thermodynamics energy flux in the SRT model. The equations were then solved to yield the mass and energy fluxes, and the liquid and vapor temperature profiles. We find the interface temperature jump is dependant on the energy flux expression. The irreversible thermodynamics energy flux closely predicts the measured temperature jump and direction. Kinetic theory models do not predict the jump, however with incorporation of a velocity dependant condensation coefficient, kinetic theory can predict the correct temperature jump direction, and vapor interface temperature. All the models predict mass fluxes that agree with the measured data. We suggest the temperature jump direction is established based on the direction of the vapor conductive energy flux, and not the direction of the mass flux (condensation or evaporation). We conclude that irreversible thermodynamics, kinetic theoiy, and SRT can all be used to model steady state evaporation and condensation.

No description available.

Thesis (M.S. - Hydrology and Water Resources)--University of Arizona, 1984. / 2 folded leaves in pocket. Includes bibliographical references (leaves 138-139).

Thesis (M.S. - Hydrology)--University of Arizona. / Includes bibliographical references (leaves 68-72).

Thesis (Ph. D. - Hydrology and Water Resources)--University of Arizona, 1969. / Includes bibliographical references (leaves 105-108).

Thesis (M.S. - Soils, Water and Engineering)--University of Arizona, 1985. / Includes bibliographical references (leaves 75-77).

Abstract of Thesis (Ph. D.)--University of Michigan, 1933. / Caption title. "Reprinted from Transactions of the American institute of chemical engineers, vol. XXIX, 1933." "Literature cited": p. 159.

Thesis (Ph. D.)--University of Wisconsin--Madison, 1958. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.