Numerical investigation of the influence of heat exchanger U-bends on temperature profile and heat transfer of secondary working fluids

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Title: Numerical investigation of the influence of heat exchanger U-bends on temperature profile and heat transfer of secondary working fluids
Authors: Clarke, R.
Finn, Donal
Permanent link: http://hdl.handle.net/10197/4784
Date: 2008
Abstract: In this paper, numerical investigations, conducted using computational fluid dynamics, on the enhancement of internal convection heat transfer following a heat exchanger U-bend under laminar flow conditions in secondary working fluids are described. Under laminar flow conditions enhanced mixing within the heat exchanger U-bends is known to occur due to the development of secondary flows, known as Dean vortices. Numerical investigations indicated that within the U-bend, secondary flows partially invert temperature profiles resulting in a significant localised decrease in average fluid temperature at the pipe surface. As a result, downstream heat transfer enhancement is observed, the magnitude of which can exceed that typical of a pipe combined entry condition in some circumstances by greater than 20% for up to twenty pipe diameters downstream. Heat transfer enhancement was found to increase with increasing U-bend radius, but to decrease with increasing heat exchanger pipe radius and internal Reynolds number
Funding Details: Other funder
Type of material: Conference Publication
Copyright (published version): 2008 the authors
Keywords: Heat TransferSecondary working fluidsHeat exchanger U-bends
Language: en
Status of Item: Not peer reviewed
Conference Details: 5th European Thermal-Sciences Conference, Eindhoven, the Netherlands, 18-22 May 2008
Appears in Collections:Mechanical & Materials Engineering Research Collection

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