A recirculating type of water tunnel is designed to produce a steady stream of fluid having uniform velocity and pressure in the test section. However, the tendency of the recirculating system is to produce variations in velocity from point to point across a section of flow due to growth of the
boundary layer. Superimposed on this variation of velocity in space is a variation of velocity in time caused by turbulence in the stream. The necessity
of diverting the stream through 360 degrees and of adding energy by means of a rotary impeller introduces the possibility of superposition of steady large-scale
turbulence on the stream, but correct design of elbows and pump can effectively eliminate this source of velocity variation.
Prepared for the David Taylor Model Basin; Department of the Navy
Ripken, John F.; Holdhusen, James S..
Model Experiments for the Design of a Sixty Inch Water Tunnel Part II.
St. Anthony Falls Hydraulic Laboratory.
Retrieved from the University of Minnesota Digital Conservancy,
Content distributed via the University of Minnesota's Digital Conservancy may be subject to additional license and use restrictions applied by the depositor.