Agricultural engineers and scientists have expressed a need for a truly portable flow measurement system that relies on simple physical principles. The system should include inexpensive and reliable sensors capable of interfacing with electronic equipment. This research will investigate the technical feasibility of such a portable flow measurement system. For over 50 years, the concept of a combination Venturi flume/Venturi tube has been known but of little utility. Impediments to application of the concept include (1) inability of measuring flows in the transition region between open channel and full pipe flow, (2) lack of primary flowmeter elements (flowtubes) that are appropriate for large conduits, and (3) unavailability of inexpensive yet accurate pressure transmitting/sensing devices appropriate for both conditions. This research will further develop the pressure transmitting/sensing concept invented during Phase I and produce an engineering prototype that implements the concept. Hydraulic laboratory evaluation of an engineering prototype of the secondary element and a large scale (36-inch diameter) flowtube will assess system accuracy and reliability.
Anticipated Results:Phase II research will result in fabrication and testing of an engineering prototype of a portable flow measurement system. The research will significantly contribute to proving the technical feasibility of the concept. If feasible, such a system will find commercial application in the determination of proper irrigation usage, in the conduct of hydrologic research, and in assisting communities plan sewer infrastructure rehabilitation efforts.
