Practice Capillary Rise In Annular Tubes (1.6.1) - Lecture - 13 - Fluid Mechanics

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6 sample questions

Question 1.
Define capillarity.
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Think about how water moves in a straw.
Question 2.
What role does surface tension play in capillary rise?
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Consider what happens at the surface of the water.
3Question 3.
What primarily drives capillary rise?
- Pressure difference
- Cohesion
- Surface tension
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Consider what occurs at the surface of the liquid.
4Question 4.
True or False: The angle of contact can affect how high a liquid rises in a tube.
- True
- False
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Reflect on the beading effect of water.
Question 5.
A glass tube has an outer diameter of 5 mm and an inner diameter of 3 mm. If the angle of contact is 30 degrees and the surface tension of water is 0.072 N/m, calculate the height of water rise.
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Substitute known values for \\(\\sigma\\), \\(\\phi\\), \\(D\\), \\(d\\), and gravitational acceleration.
Question 6.
Explain how increasing the inner diameter of an annular tube affects the capillary rise.
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Reflect on how the forces balance in larger tubes.

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