Heat Transfer

May 8th, 2015
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Single-Phase Convective Heat Transfer in a Pipe with Curvature Abstract: Heat transfer and heat exchanger devices that contain tubes many times contain tube bends and fittings. The resulting streamwise curvature of fluid due to the presence of bends and fittings creates secondary flows resulting in an overall increase in convective heat transfer.

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Heat TransferME 8342 - Convection D. M. Lunde Candidate M.S. StudentSingle-Phase Convective Heat Transfer in a Pipe with Curvature Abstract: Heat transfer and heat exchanger devices that contain tubes many times contain tube bends and fittings. The resulting streamwise curvature of fluid due to the presence of bends and fittings creates secondary flows resulting in an overall increase in convective heat transfer. The physical underpinnings that cause this effect are discussed and an attempt is made to tie together the previous work in this area of study for the calculation of practical, engineering values. The discussion begins with identifying curvature geometry, it then moves to the development of the governing momentum and energy equations (both laminar and turbulent), and ends with a review of work done in solving these equations and a summary of corresponding experimental work.I.Introduction:Curved pipes are commonplace in nearly all piping networks. They are quite prevalent in applications where heat transfer between fluid-fluid and fluid-solid mediums takes place. Some common examples of curved pipes appear in large chillers and boilers, shell and tube heat exchangers, fin-tube heat exchangers, and chemical reactors for industrial processes [3]; they can be classified in the following ways: helical coils, spirals, and tube bends (fittings). See Figures 1, 2 and 3 respectively. Notice the radius of curvature R is constant for a pipe bend and helical coil, b

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