is a model used to study the effect of mobility ratio on sweep efficiency. In this model the flow occurs through the space between two horizontal parallel plates separated by a very small distance from each other (0.03 to 0.04 inches). The dimensions of the plates represent the smallest unit of scale arrangement of wells to be studied. The displacing fluid is added to a dye, making it easier to follow the invasion front, either taking photographs or by strokes by hand on transparent paper.
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