Laminar Flow Table

The laminar, two-dimensional flow is a good approximation of the flow of ideal fluids: the potential flow. All physical systems described with the Laplace equation can be demonstrated with potential flow. This includes heat flow and potential theory, for example. The core element of the trainer is a classical Hele-Shaw cell with additional water connections for sources and sinks. The laminar, two-dimensional flow is achieved by water flowing at low speed in a narrow gap between two parallel glass plates. The flow generated in this way is non-vertical and can be regarded as potential flow. The streamlines are displayed in colour by introducing a contrast medium (ink). In experiments an interchangeable model is inserted into the flow, such as a cylinder, guide vane profile or nozzle contour. Sources and sinks are generated via eight water connections in the bottom glass plate. The streamlines can be clearly observed on the screened glass during flow around and through. A flow straightener ensures consistent and low turbulence flow. The water flow and the amount of contrast medium added can be adjusted by using valves. The water connections are also activated by valves and can be combined as required. The well-structured instructional material sets out the fundamentals and provides a step-by-step guide through the experiments.

RANGE OF EXPERIMENTS

• Flow around drag bodies: cylinder, guide vane profile, square, rectangle
• Flow through models: nozzle contour, discontinuous constriction or enlargement
• Flow separation, flow with 90° redirection