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Numerical Investigation of Short Elliptical Twisted Tube for Reduced Fouling Rate in Steam Cracking Furnaces

Abstract : In the steam cracking industry of natural gas or naphtha, fouling of tubular heat exchangers by cokes is a major issue. This growing carboneous layer has two major negative effects: 1) it increases pressure drop and 2) reduces heat transfer from the tube wall to the processed fluid. Using the open-source Computational Fluid Dynamics software OpenFOAM, this study numerically investigates wall shear stress, pressure drop and heat transfer performances of swirl decaying flow generated by different elliptical cross-section twisted tube. One of the objectives is to determine if minor modifications of tube geometry can generate swirling flow which could enhance wall shear stress at a reduce pressure drop penalty. For a Reynolds number ranging from 10, 000 to 100, 000, it is shown that the investigated geometries could enhance heat transfer by 90% at an increased pressure drop of 128% which yields a Performance Evaluation Criterion (PEC) of 1.44. The comparison between the performances of the different geometries is carried out using a newly defined PEC based on the bulk temperature, along with the usual PEC
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https://hal-uphf.archives-ouvertes.fr/hal-03534362
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Submitted on : Wednesday, January 19, 2022 - 1:55:29 PM
Last modification on : Monday, June 27, 2022 - 2:57:15 PM

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Bruce Indurain y Urricelqui, François Beaubert, David Uystepruyst, Sylvain Lalot, Mathieu Couvrat. Numerical Investigation of Short Elliptical Twisted Tube for Reduced Fouling Rate in Steam Cracking Furnaces. Heat Transfer Engineering, Taylor & Francis, 2021, pp.1-12. ⟨10.1080/01457632.2021.1963536⟩. ⟨hal-03534362⟩

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