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As a new mechanical engineer for Engines Inc., you have

Chapter 17, Problem 22E

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QUESTION:

As a new mechanical engineer for Engines Inc., you have been assigned to design brass pistons to slide inside steel cylinders. The engines in which these pistons will be used will operate between 20.0o C and 150.0o C. Assume that the coefficients of expansion are constant over this temperature range. (a) If the piston just fits inside the chamber at 20.0o C, will the engines be able to run at higher temperatures? Explain. (b) If the cylindrical pistons are 25.000 cm in diameter at 20.0o C, what should be the minimum diameter of the cylinders at that temperature so the pistons will operate at 150.0o C?

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QUESTION:

As a new mechanical engineer for Engines Inc., you have been assigned to design brass pistons to slide inside steel cylinders. The engines in which these pistons will be used will operate between 20.0o C and 150.0o C. Assume that the coefficients of expansion are constant over this temperature range. (a) If the piston just fits inside the chamber at 20.0o C, will the engines be able to run at higher temperatures? Explain. (b) If the cylindrical pistons are 25.000 cm in diameter at 20.0o C, what should be the minimum diameter of the cylinders at that temperature so the pistons will operate at 150.0o C?

ANSWER:

Solution 22E 0 The engines operate between 20 150 C . The coefficients of expansion is constant over this range. a) 0 If the piston just fits inside the chamber at 20 C , then the engine can’t work anymore. 0 Because 20 C is the minimum temperature where the engines can work. As the piston is already fit at this temperature, with higher temperature provided by the engine, it would expand only

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