Conduction inverse sur un cylindre en rotation : Cas de l'ébullition convective induite par l'impact d'un jet d'eau

Abstract : In this thesis, we are interested in the problem of cooling by an impinging jet of a hot moving surface. One of the objectives is a better understanding of the boiling mechanisms resulting from the interaction between the jet and the wall. The industrial application is related to the steel industry. It concerns hot rolling process, during which steel plates brought up to temperatures ranging from 750 to 1000ÊC undergo a quenching by water jets (temperatures around 75ÊC) whose kinetics fixes the microstructure of steel and consequently determines its mechanical properties. Another objective is to develop a methodology for determining the heat fluxes extracted during the impingement of a moving surface by a water jet. The development of a stable estimation method, closely associated to an experimental bench and a specific procedure, allows to provide this type of indirect measurements on a broad range of temperatures corresponding to boiling. The proposed inverse heat conduction method consists in analyzing temperature responses measured on a rotating solid cylinder impinged by a water jet. A Fourier transform is applied to the Laplace transform of the signals provided by several thermocouples embedded at a fixed radius close to the wall. In the case of a linear problem, an explicit relationship between the Laplace-Fourier transform of the internal temperature and the Fourier transform of the temporal distribution of parietal heat flux can be found. The inversion of this equation provides an explicit algorithm making an easy estimation of the space and temporal distributions of parietal heat flux possible. Simulations of inversion and real measurements are presented: they show the robustness of the inversion technique and allow to study the influence on heat transfers of parameters such as velocity, temperature of the jet and wall velocity.
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Fabien Volle. Conduction inverse sur un cylindre en rotation : Cas de l'ébullition convective induite par l'impact d'un jet d'eau. Autre. Université Henri Poincaré - Nancy 1, 2006. Français. ⟨NNT : 2006NAN10175⟩. ⟨tel-01754281⟩

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