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Viscosity

Viscosity. Isaac Newton studied viscosity. Viscosity: Connecting with Chemistry and Biology. Does air resistance increase as v or v2???. Air resistance produced by collisions of gas molecules. Air Resistance Increases with Temp Proportional to v for slow speeds

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Viscosity

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  1. Viscosity Isaac Newton studied viscosity

  2. Viscosity: Connecting with Chemistry and Biology Does air resistance increase as v or v2???

  3. Air resistance produced by collisions of gas molecules Air Resistance Increases with Temp Proportional to v for slow speeds Proportional to v2 for higher speeds Because of turbulence Reynolds number provides dividing line Visc.smd

  4. Viscosity/friction in a fluid Decreases with increasing Temp Produced by decreasing intermolecular forces Non-Newtonian Fluids Viscosity_liquid.smd 3 oils/5 temp

  5. Applications Bernoulli’s equation Non-newtonian fluids Pouiselle’s Equation: Q ~ r4 Alt. Models:fractals, percolation Dr. Jean Leonard Marie Poiseuille Checks his heart

  6. Introduction • Provides a connection between math, chemistry Biology and Physics • Provides students a chance to look at alternate scientific models. • Provides a molecular explanation as an alternate to the usual continuous model

  7. Intended Audience AP,Honors, Regular Physics Builds on what students have learned in other classes

  8. Adjustments/Adaptations None required-all levels of Physics can handle

  9. Placement in Curriculum After kinematics and dynamics Some concepts such as Pressure were learned in Chem

  10. Goals and Objectives • Determine the relationship between temp and viscosity for both gases and liquids • Compare different models for viscosity • Understand the usefulness of Reynold’s number • As a criterion for distinguishing turbulent and nonturbulent flow. • Give reports on the application of viscosity to other fields such as Biology, Chemistry and Engineering

  11. Time Line

  12. The End ….. Thank You …..

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