Also, valves and a vacuum pump allow students to connect two sources and two sinks(or any combination of both). When placed between the two plates, students can see the streamline patterns flowing around the models. The apparatus comes with a rubber sheet from which to cutout various shapes of models. The removable top glass plate has grid lines to help analysis of the flow patterns. A dye flowing through several small holes at the upstream end produces streamlines. Water flows along the channel at a low Reynolds number, so the inertia forces are not important. The equipment consists of a channel formed between two plates. The apparatus works with a steady, air-free water supply and suitable drain. Thus lecturers can also use itto represent flow in other branches of engineering, such as aerodynamics or electricity and heat flow. The apparatus can represent water seepage through solids,and can simulate any process satisfying the Laplace equation in two dimensions. It allows students to study various source and sink arrangements, and look at flow around an unlimited variety of different shaped models. Hele-Shaw apparatus produces streamline sin a laminar, steady flow.
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