HW 1 Solution

# HW 1 Solution - ME 309 Fall 2008 Section 2(Merkle Homework...

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ME 309 Fall 2008 Section 2 (Merkle) Homework # 1 Due Wed 27 Aug 2008 Problem 1-1. Using Appendix A in the text, find values for the following fluid properties. Express all answers in terms of SI units, using kg/m 3 for density and kg/m-s for viscosity. Find : a ) The minimum allowable viscosity of SAE 20W oil at -10 C ; (Note: The middle column of Table A.5, pg 705 gives the dynamic viscosity of oil, μ , but the two right columns give the kinematic viscosity, ν . These two quantities are related to each other by the fluid density, ρ as: ν = μ / ρ ). b ) The minimum allowable dynamic viscosity of SAE 20W oil at 100 Ci For the density of oil, use ρ = 820 kg/m 3 . c ) The density and dynamic viscosity of water at 5 C ; d ) The density and dynamic viscosity of water at 95 C ; e ) The density and dynamic viscosity of air at 5 C at atmospheric pressure; f ) The density and dynamic viscosity of air at 95 C ; g ) From a through f , what major differences do you observe between oil, water and air? (Note air and water are two of the most common fluids of interest for both practical and engineering reasons.) h ) Find the units of the product of density times velocity (measured in m/s ) times a length (measured in m ) divided by dynamic viscosity; Solution: a ) Find : The minimum allowable viscosity of SAE 20W oil at -10 C ; Answer : From Table A.5, p 705, SAE 20W oil must have a viscosity greater than or

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## This note was uploaded on 03/09/2010 for the course ME 309 taught by Professor Merkle during the Spring '08 term at Purdue.

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HW 1 Solution - ME 309 Fall 2008 Section 2(Merkle Homework...

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