Modelling of the cooling process of steel tubes in a rake type cooling bed

Juraj Raic, Martin Landfahrer, Jürgen Klarner, Thomas Zmek, Christoph Hochenauer

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Despite the fact that production speed in a hot tube rolling facility is highly dependent on effective cooling of theoutput product, the mechanisms of the heat transfer in cooling beds are only addressed in few experimental andnumerical studies. As a result, industry calls for a mathematical model, which is capable of predicting heattransfer rates and temperatures for the transient cooling process of steel tubes in a rake type cooling bed.Compared to current state-of-the-art approaches, the present work takes a major modification into account:Horizontal spacing between the tubes,SD/h, was identified as having a significant impact on the heat transfer. Itsinfluence on natural convection and radiation was investigated in CFD simulations on a horizontal cylinder arrayfor Rayleigh numbers in the range of⩽⩽Ra101048. Based on the results of the numerical investigation, cor-rection functions for the heat transfer in existing correlation equations were introduced. In the range of⩽⩽SD1.25/3.0h, convective heat transfer in the tube array increases by up to9.91%compared to an individualtube, while heat transfer due to radiation decreases by up to25.39%.
Original languageEnglish
Article number114895
Number of pages14
JournalApplied Thermal Engineering
Volume169
DOIs
Publication statusPublished - 25 Mar 2020

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