heat_excha - MIT OpenCourseWare http://ocw.mit.edu 2.672...

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Unformatted text preview: MIT OpenCourseWare http://ocw.mit.edu 2.672 Project Laboratory Spring 2009 For information about citing these materials or our Terms of Use, visit: http://ocw.mit.edu/terms . 3. Heat Exchanger Tube Vibrations Your firm has been hired as a consultant by a steel fabricator that operates a number of hot-forging presses with water-cooled dies. The cooling water runs through a water-to-air heat exchanger next to each machine, which consists of a number of copper pipes with brazed-on fins. These pipes are in turn brazed to a manifold and support structure, as shown below. Your client is experiencing catastrophic failure of heat exchanger tubes on some of its presses. They note that these heat exchangers failed when the coolant reached a moderately high temperature, and that the failures were preceded by rattling noises from the heat exchangers. Upon close inspection, the tubes appear to have been vibrating and rubbing against their neighbors before failing. You also observe a noticeable rumble in the floor vibrating and rubbing against their neighbors before failing....
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heat_excha - MIT OpenCourseWare http://ocw.mit.edu 2.672...

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