# hwk11_sol - ME 410 Spring 2008 Homework 10 Due 1 Air at...

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ME 410 Spring 2008 Homework 10 Due: March 27, 2008 1. Air at 4E-4 kg/s and 27˚C enters a triangular duct that is 20 mm on a side and 2 m long. The duct surface is maintained at 120˚C. Determine the air outlet temperature. T s = 120°C Determine Air outlet temperature Mathematical model for isothermal wall in duct flow () case this in , where , h c m x h P s i m s m D Perimeter P e T T T x T p π = = Should be evaluated at x=L to find outlet temperature. Need to find average convection coefficient to determine outlet temperature. Classify problem Forced convection—Internal Flow—Triangular—parallel flow I-B-14-(i), now determine if flow is laminar or turbulent. Properties will need to be determined at the average of the mean inlet and outlet temperature, the outlet temperature is not known. The upper bound on the outlet temperature is 120°C, assume a value slightly less then that and approximated the properties. Check once calculation is done if assumption was correct, iterate if necessary. Assume

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## This note was uploaded on 07/25/2008 for the course ME 410 taught by Professor Benard during the Spring '08 term at Michigan State University.

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hwk11_sol - ME 410 Spring 2008 Homework 10 Due 1 Air at...

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