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Second Thermal and Fluids Engineering  Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

PROPER SCALING OF FLOW IN CONCENTRIC HELICAL AND SPIRAL COILS

John H. Kennedy
Department of Mechanical Engineering, Bradley University, Peoria, IL 61625, USA

Ammar Hamza
Department of Mechanical Engineering, Bradley University, Peoria, IL 61625, USA

Ahmad Fakheri
Department of Mechanical Engineering, Bradley University, Peoria, Illinois, USA

Abstract

In this study, coil diameters, aspect ratio and fluid properties are varied in order to understand the factors influencing friction factor and heat transfer in concentric helical pipes. Simulations are performed using the open source software OpenFOAM. The Geometry is created using Creo, then imported and meshed using a standard mesher (Ansys Workbench), and then imported into OpenFOAM and numerical solutions are obtained. An experimental investigation is also conducted and compared with the numerical studies. In this study, we examine extending the concept of modified friction factor that uses the geometric mean of the coil diameter and tube hydraulic diameter as the relevant scale for friction factor, to concentric helical pipes. Using this scale, the modified friction factor becomes only a function of Dean number, and the effects of the other two parameters, the coil diameter and the ratio of the inner to outer diameters appear to be wrapped into the new scaling and individually seem to have minimal impact on the modified friction factor.

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