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Subcritical Contraction For Improved Open-Channel Flow Measurement Accuracy With An Upward-Looking Advm, Daniel Howes, Charles M. Burt, Brett F. Sanders
Subcritical Contraction For Improved Open-Channel Flow Measurement Accuracy With An Upward-Looking Advm, Daniel Howes, Charles M. Burt, Brett F. Sanders
BioResource and Agricultural Engineering
Acoustic Doppler velocity meters (ADVMs) provide an alternative to more traditional flow measurement devices and procedures such as flumes, weirs, and stage rating for irrigation and drainage canals. However, the requirements for correct calibration are extensive and complex. A three-dimensional computational fluid dynamics (CFD) model was used to design a subcritical rapidly varied flow contraction that provides a consistent linear relationship between the upward-looking ADVM sample velocity and the cross-sectional average velocity in order to improve ADVM accuracy without the need for in situ calibration. CFD simulations validated the subcritical contraction in a rectangular and trapezoidal cross section by showing …
Commercial Sand Media Filter Tank Criteria For Energy Efficiency - Agricultural Drip Irrigation, Charles M. Burt
Commercial Sand Media Filter Tank Criteria For Energy Efficiency - Agricultural Drip Irrigation, Charles M. Burt
BioResource and Agricultural Engineering
Sand media filters are commonly used in agricultural drip irrigation systems. They have the advantages of simplicity and large capacities, and are favored by many farmers and designers over other filtration hardware. The primary justification for the research described in this report was to determine if it is possible and reasonable to use lower-than-accepted backflush pressures and thereby reduce the total pressure requirement for drip systems.