Physics Help Forum fluid shear stress in Polar coordinate

 Thermodynamics and Fluid Mechanics Thermodynamics and Fluid Mechanics Physics Help Forum

 Feb 15th 2014, 10:04 AM #1 Junior Member   Join Date: Feb 2013 Posts: 17 fluid shear stress in Polar coordinate Dear all please help me to understand about how to derive the fluid shear stress in Polar coordinate. see as follows http://i.imgur.com/lqizIbt.jpg than u for ur help!!
 Feb 21st 2014, 06:53 AM #2 Physics Team     Join Date: Jun 2010 Location: Morristown, NJ USA Posts: 2,324 Let's start with fundamentals. Fluid stress is proportional to the rate of change of velocity in one direction per unit distance in the orthogonal direction. In other words - how quickly velocity changes across a flow front. In polar coordinates the rate of change of radial velocity per unit circumference is is: The rate of change of tangential velocity per unit radial distance is where omega = angular velocity in radians/second. Since omega = v_theta/r you get: If this is unclear it may help fo you to draw out a sketch to see how it works. Last edited by ChipB; Feb 21st 2014 at 02:19 PM.
 Feb 25th 2014, 07:17 PM #3 Junior Member   Join Date: Feb 2013 Posts: 17 thank u for ur help ^^

 Tags coordinate, fluid, polar, shear, stress

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