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2017 ASEE Annual Conference & Exposition

Method for a Low Cost Hydrokinetic Test Platform: An Open Source Water Flume

Presented at Division Experimentation & Lab-Oriented Studies - Mechanical Engineering Labs

While educational wind tunnels are common place for instruction and experiments in fluid mechanics, they generally do not possess the capabilities to perform hydrodynamic testing. This paper will present the work by the authors to develop a water flume that would allow hydrodynamic testing at velocities up to 2.0 m/s. The flume was constructed by an undergraduate and at a cost lower than commonly available commercial units. Both the fabrication process and the potential experiments that the flume could house are designed to improve student learning in the area of fluid mechanics. The design is developed to be relatively compact, with a 7’x3.5’ footprint and utilizes a commonly available single-stage centrifugal pump. Flow velocities in the test section can be varied passively by changing the insert containing the test section and actively with a recirculation valve. The total cost for this project was approximately $3500 and required 3 months of part-time work to construct. Flow velocity measurements in the test section were made by simple flow visualization and found velocity ranged from 0.32-0.65 ft/s within a 6”x12”x12” test section. The water flume was subsequently used by a senior capstone project for testing of their water turbine. Student self-evaluations were used to assess whether their experiences reinforced fluid mechanics concepts and developed their skills in experimental fluid mechanics. The results show that the students believed their work with the water tunnel strongly met the learning objectives in the area of experimental methods and somewhat met in the area of concepts. Although the data set was small (5 students), it does show promising correlations that highlight the potential of the water flume in an engineering educational environment.

Authors
  1. Ryan Curtis Darfler California State University, Maritime University [biography]

    Ryan Darfler is currently a senior in Mechanical Engineering at California State University, Maritime Academy. His expected graduation date is August 2017. His research interests are in the testing and development of renewable energy platforms, with emphasis in the fluid dynamics aspects. In addition to his interest in fluid mechanics, he has experience as a fluid controls engineer.

  2. Dr. William W. Tsai California State University, Maritime Academy [biography]

    Dr. William W. Tsai is an assistant professor in the Mechanical Engineering Department at California State University, Maritime Academy (CSUM). His research background is fluid mechanics and heat transfer and is studying laboratory education in those fields. Prior to CSUM, Dr. Tsai was a Member of the Technical Staff in the Fluid Mechanics Group at The Aerospace Corporation. Dr. Tsai earned his Ph.D., M.S., and B.S. at the University of California, Berkeley in Mechanical Engineering.

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