PHYS 1080 Lecture Notes - Lecture 8: Intermolecular Force, Viscosity, International System Of Units
23 Mar 2016
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For simple flow, fluid follows streamline paths. A molecule will follow its own streamline. Turbulent flow is the exception (next week) The physical principle: for a liquid flowing along a tube, it doesn"t magically disappear or appear part way through. Explains why shower nozzle shoots out fast. Same amount of volume flows out as flows in. Same volume leaves tube as enters: v1 = v2. Anywhere within the tube, we can say a*v=constant: a1x1=a2x2. Problem: suppose a pipe of radius r1 splits into 3 paths, each of radius r2 = r1/4. R2 = r3 = r4 = r1 / 4. V1 = 3v2 / 16 sub in v1. Delta e= (mgy2 mgy1) + ( mv2. Pressure difference at either end does work moving with the fluid. Blood flows in a horizontal artery of a diameter of 3. 0x10-3m. At a smooth constriction, the blood pressure drops by 40 pa. 2 = p2 + pgy2 + p 2.
