Lecture 4 - Announcements . A schedule for technical...

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Announcements . ¾ A schedule for technical writing has been posted—the class on Monday, February 22 will be entirely on technical writing. ¾ Please read Chapter IV in the course packet.
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Viscous Shear Forces V / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / Ƭ = F/A = μ V/d d t
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¾ More generally, the viscous shear stress may be written in terms of the local velocity gradient as, Ƭ yx = μ du/dy (shear force in the x-direction, acting on a plane normal to the y-direction) ¾ The viscosity μ is often called the absolute or dynamic viscosity to distinguish it from the kinematic viscosity ʋ = μ/ ρ , where ρ is the fluid density (g/cm 3 ). ¾ The cgs unit of viscosity, called the poise , is 1 g/(cm•s).
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parameter The Reynolds number is a qualitative expression of the ratio of inertial to viscous forces ¾ The mass flow rate per unit area (g cm -2 s -1 ) is the product of the fluid density ρ (g/cm 3 ) and the fluid velocity V (cm/s) ¾ The momentum flux is the product of the mass flow rate per unit area, ρ V , and the fluid velocity V The momentum flux ( inertial force per unit area) = ρ V 2 ¾ The viscous force
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This note was uploaded on 09/27/2010 for the course A&EP 264 at Cornell University (Engineering School).

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Lecture 4 - Announcements . A schedule for technical...

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