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Hot on the trail of the Very Viscous Liquid!

Hot on the trail of the Very Viscous Liquid!. Maria Ekiel – Jeżewska Maciej Lisicki. What is viscosity?. What features characterize the motion of the Very Viscous Liquid? Let's experiment!. 1. Mixing of tea and mixing of honey.

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Hot on the trail of the Very Viscous Liquid!

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  1. Hot on the trail of the Very Viscous Liquid! Maria Ekiel – Jeżewska Maciej Lisicki

  2. What is viscosity? What features characterize the motion of the Very Viscous Liquid? Let's experiment!

  3. 1. Mixing of tea and mixing of honey In which liquid is it harder to manipulate a spoon? Which exerts larger drag on the spoon?

  4. 1. Mixing of tea and mixing of honey In which liquid is it harder to move a spoon? Which exerts larger drag on the spoon? THIS ONE! Very Viscous Liquid

  5. 2. Making liquids move In which liquid it it easier to make it move? Which one could be honey? G.M. Homsy, Multimedia Fluid Mechanics, Cambridge Univ. Press

  6. 2. Making liquids move In which liquid it it easier to make it move? Which one could be honey? THIS ONE! Very Viscous Liquid G.M. Homsy, Multimedia Fluid Mechanics, Cambridge Univ. Press 6

  7. 3. The spinning glass – I can't keep pace with you! – shouted the liquid from inside a glass, which has just started rotating. Was this the voice of tea or honey?

  8. 3. The spinning glass After an hour the rotation stopped. Did the tea or honey still move afterwards?

  9. 4. The mystery of floating radish A puzzle: We will show you two liquids: A and B. Which one is more viscous?

  10. Liquid A G.M. Homsy, Multimedia Fluid Mechanics, Cambridge Univ. Press 10

  11. Liquid B G.M. Homsy, Multimedia Fluid Mechanics, Cambridge Univ. Press 11

  12. The puzzle solved! In liquid A the radish moves even after we have stopped rotating the vessel. In liquid B the radish stops immediately after rotation is stopped. Liquid B is the Very Viscous Liquid!

  13. Motion of the Very Viscous Liquid has been damped very quickly!

  14. 5. Races of balls in liquids Water Oil Glycerine Honey All those liquids have similar density.

  15. 5. Races of balls in liquids START! Water Oil Glycerine Honey All those liquids have similar density.

  16. Comparison of falling times Very short Short Loong Veeery Looong Honey Viscosity = 20 000-100 000 Glycerine Viscosity = 1000 Water Viscosity = 1 Olej Viscosity = 100

  17. Wanted: Very Viscous Liquid Photofit portrait: 1. To make the Very Viscous Liquid move, one has to push it hard constantly. 2. Motion of the Very Viscous Liquid is damped very quickly. 3. The more viscous the Very Viscous Liquid is, the slower the ball falls.

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