Lecture_9_notes - ChE 374Lecture 9Bernoulli Applications...

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Unformatted text preview: ChE 374Lecture 9Bernoulli Applications Bernoulli Equation: P + v2 2 + gz = C + gz = 0 P2 P P1 + + v 2 2 2 2 v1 + gz1 = + 2 v2 2 + gz2 Assumptions: SS, Incompressible, No Friction, (Ws = 0, Q = 0, Streamline). Converting between Pressure, Velocity and Height (P, K.E., P.E.) Each term is energy per kg (m2 /2 = J/kg = kgm2 /kgs2 ). Divide through by g to get the HEAD FORM with units of length: P g + v2 2g +z =C P g P g + z HGL +z+ v2 2g EGL Fix one term, vary another, and watch how the third changes: Fixed z: increase v, decrease P and vice-versa; (fix v; fix P; repeat) Problem Solving: B.E. alone solve many kinds of problems. The challenge is HOW to apply it. Questions: Ask these and Answer them: What What What What Do I Know? is Wanted? is Going on Physically? relationships do I have (mass, energy etc.) WRITE THESE DOWN and DRAW A PICTURE (Problem/Question) (Equation Set) (Solve) (Assess). B.E.: Write the equation (always do this) Draw a picture Pick points for application May require more than one application PRACTICE! Do book examples, they are as important as the text. Study book examples carefully Try them yourself first, then analyse the solution. Applications Diffuser Spool HW 5-47 Siphon ...
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This note was uploaded on 03/11/2012 for the course CHE 374 taught by Professor Davidlignell during the Fall '12 term at Brigham Young University, Hawaii.

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Lecture_9_notes - ChE 374Lecture 9Bernoulli Applications...

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