Numerical investigation of the influence of heat exchanger U-bends on temperature profile and heat transfer of secondary working fluids
|Title:||Numerical investigation of the influence of heat exchanger U-bends on temperature profile and heat transfer of secondary working fluids||Authors:||Clarke, R.
|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authors||Keywords:||Heat Transfer; Secondary working fluids; Heat exchanger U-bends||Language:||en||Status of Item:||Not peer reviewed||Conference Details:||5th European Thermal-Sciences Conference, Eindhoven, the Netherlands, 18-22 May 2008|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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