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# Exam_1 - ChBE421 Test#1 Fall 2009 1(25 pts Answer briefly(5...

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ChBE421 Test #1 Fall 2009 1. (25 pts) Answer briefly (5 pts) Consider a ball (dimension ‘L’) thrown at a defined velocity (‘U’). If the density of the liquid through which the ball is thrown is doubled while the viscosity is reduced by 1/3, does the flow become more laminar or turbulent? By what factor does the Reynolds number increase or decrease? (3 pts) What are the three conditions required to be met for simplification of the integral mass, energy and momentum balances to their respective special cases? (4 pts) Please write out the complete integral energy balance equation (Accum = Input – Output) and define the physical meaning of each term. (5 pts) What assumption must be made to simplify the Mechanical Energy Balance into Bernoulli’s Equation? (8pts) When considering pump efficiency ( η p ): 1) how is η p determined (this is an equation), 2) what are the limits the size of η p , 3) write the component of the mechanical energy balance equation where η p is applied, and 4) is the lw term in the mechanical energy balance equation now negligible, or if not, what is it’s physical meaning?

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Exam_1 - ChBE421 Test#1 Fall 2009 1(25 pts Answer briefly(5...

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