Mechanics of Fluids - Topic 2 - Example 6 - Viscosity - Rotating Cone in Annulus

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Mechanics of Fluids - Topic 2 - Example 6 - Viscosity - Rotating Cone in Annulus
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Thank you sir.I had a doubt as to which direction to take gradient. In this case we could take the gradient in horizontal or vertical direction but we took perpendicular to the two surfaces. What is the reason behind it?

SauravKumar-exbv
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If cone is exchanged to hemisphere, what would be the solution? Plz help sir

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