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

This preview shows pages 1–6. Sign up to view the full content.

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.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Viscous Shear Forces V / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / Ƭ = F/A = μ V/d d t

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
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).
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

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

## This note was uploaded on 09/27/2010 for the course A&EP 264 at Cornell University (Engineering School).

### Page1 / 26

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

This preview shows document pages 1 - 6. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online