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Abstract Title: Apparent Paradox Between Bernoulli's and Hagen-Poiseuille's Principles
Abstract: Our research focuses on developing multi-representational tools to assist student understanding of fluids.  The research objective is to reconcile the counterintuitive result students have when applying the Bernoulli Principle to a constricted blood vessel. Students find the pressure decrease with increasing fluid speed to be at odds with their understanding of the resulting pressure increase of a blocked artery. In order to evaluate the apparent paradox generated by Bernoulli's Principle and Hagen-Poiseuille's Principle, students were asked to explain the following three fluid dynamics experiments diagrammatically, graphically, mathematically, and verbally:
1. A simulated blood vessel constriction.
2. Flow through a Venturi apparatus and
3. A free-fall microgravity simulation.
Pairs of students were interviewed before and after coverage of the content in class. In the post-interview they were given an open-ended question to answer regarding why blood pressure rises when blood vessels are blocked. Preliminary results indicate that hands-on exposure to the tactile demonstrations enables qualitative explanations without relying on mathematical tools.
Abstract Type: Contributed Poster Presentation

Author/Organizer Information

Primary Contact: Elizabeth Whitmore
University of New England
11 Hills Beach Road
Biddeford, ME 04005
Phone: 207-749-7913
and Co-Presenter(s)
James Vesenka