Graduate Thesis Or Dissertation

 

Ambient current effects on vertical selective flow withdrawal in a two layer reservoir system Public Deposited

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  • Withdrawal from a two-layer flow field is examined in terms of the degree of selectivity of the withdrawal flow and its dependence on an ambient current. Selectivity is defined as the bias of withdrawing one layer more strongly than the other; the extreme' case is complete selective withdrawal, where one layer is drawn in alone. Relevant physical parameters included in the study are: the rate of withdrawal, dimensions of the intake, the depth of each layer, and the elevation of the intake above the two strata density-interface. The fluid parameters of interest are density and viscosity. Significant flow phenomena include: the limiting conditions of selective withdrawal, stability of the interface, interfacial waves, velecity shear and mass transport. Withdrawal from a two strata flow field to a point sink located in the upper strata is examined experimentally. Tests are made for various density differentials across the interface, elevations between the intake and the interface, and relative velocities between the flow field and the intake. The results show that within a range of separating heights of the intake from the interface the degree of selectivity is a quasi-linear function of the separating height. Of special interest is the observation that the degree of selectivity approaches unity slowly after passing a critical value of the dimensionless separation height. The influence of the density difference across the interfacial region is negligible when the intake is close to the density-interface, but increases in importance as the separating height is increased. For selective stratifies flow withdrawal the influence of ambient currents is complex. Generation of interfacial waves caused by the moving intake (which acts as a moving low-pressure area) can both increase and decrease the selective withdrawal. If such waves can be excluded then an ambient current would be expected to enhance the phenomena of selective withdrawal.
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