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Abstract

In the first part of this work the problem of simultaneous heat and mass transfer in an air water vapour mixture is considered. The physical model is an inclined rectangular cavity with the two longer parallel faces maintained at constant and different temperatures. A film of water flows over the lower and hotter parallel face of the cavity. Evaporation takes place from this face, and at the same time condensation occurs on the upper and cooler parallel face. A natural recirculating flow is established in the cavity, and the equations of continuity, momentum, energy and diffusion are solved numerically. The air in the cavity is assumed non-soluble. As an initial test the procedure is applied to pure heat transfer in an inclined rectangular cavity. Secondly, the problem of water distillation in a vertical cavity is examined. In both cases results are compared with the
pertinent previously reported data. Finally the procedure is applied to distillation in an inclined cavity at 10 degrees increments of inclination between 0 and 90 degrees. In each case two types of correlation
model are obtained.
In the second part of the work the results of the first part are applied to solar distillation of saline water, in which the evaporative cavity face is heated by incident solar radiation. In conjunction with this work
global radiation reaching the earth is examined. A computer simulation method for predicting the solar energy availability is given along with the results of applying the method to the Persian Gulf.
The relationship between the solar energy absorbed by a tilted solar still and other interrelated components of energy transfer is formulated. The
distillation rate, as a function of solar radiation and other parameters, is obtained. Finally the performance of a tilted solar still, and the effect of atmospheric variables, design factors and operational conditions are
examined.

Publication Type:	Thesis (Doctoral)
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) T Technology > TJ Mechanical engineering and machinery
Departments:	School of Science & Technology > Engineering School of Science & Technology > School of Science & Technology Doctoral Theses Doctoral Theses

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