Thermodynamics HW Solutions 515

Thermodynamics HW Solutions 515 - Chapter 6 Fundamentals of...

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Unformatted text preview: Chapter 6 Fundamentals of Convection Velocity and Thermal Boundary Layers 6-12C Viscosity is a measure of the “stickiness” or “resistance to deformation” of a fluid. It is due to the internal frictional force that develops between different layers of fluids as they are forced to move relative to each other. Viscosity is caused by the cohesive forces between the molecules in liquids, and by the molecular collisions in gases. Liquids have higher dynamic viscosities than gases. 6-13C The fluids whose shear stress is proportional to the velocity gradient are called Newtonian fluids . Most common fluids such as water, air, gasoline, and oils are Newtonian fluids. 6-14C A fluid in direct contact with a solid surface sticks to the surface and there is no slip. This is known as the no-slip condition , and it is due to the viscosity of the fluid. 6-15C For the same cruising speed, the submarine will consume much less power in air than it does in water because of the much lower viscosity of air relative to water. water because of the much lower viscosity of air relative to water....
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This note was uploaded on 01/22/2012 for the course PHY 4803 taught by Professor Dr.danielarenas during the Fall '10 term at UNF.

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