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Fluctuations de température en aval d'une jonction orthogonale d'écoulements turbulents de températures différentes

Abstract : This research work originates from thermal stress issues in hydraulic pipes. It specifically focuses on determination of thermal load created by mixing flows in orthogonal pipe junctions. Such mixing zones are commonly used to cool or heat the main flow. For high Reynolds number values and high difference of temperature of the two flows, thermal load created by strong temperature fluctuations at the wall can initiate and propagate cracks through the pipe. Standards in pipe design pointed out the need in knowing these thermal loads applied at the downstream junction wall. Thus, this study aims to characterize three-dimensional and unsteady dynamical and thermal phenomena in a simplified industrial configuration. First, an experimental investigation based on particle image velocimetry and infrared thermography has been carried out on a cylindrical jet pipe flowing through a main rectangular channel flow. Different parameters have been studied such as Reynolds number influence, velocity ratio between secondary and main flow and temperature difference. One of the experimental configurations has also been investigated using numerical simulations. LargeEddy Simulations with conjugate heat transfer model has been developed and compared to the experimental database. Dynamics and Thermal mechanisms have been analysed near the wall and within the wall with obtained statistical flow fields, velocity-temperature moments and numerical probes extracted from fluid and solid parts.
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Submitted on : Tuesday, November 9, 2021 - 1:14:06 PM
Last modification on : Tuesday, November 23, 2021 - 9:44:56 AM

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  • HAL Id : tel-03420716, version 1


Sébastien Menanteau. Fluctuations de température en aval d'une jonction orthogonale d'écoulements turbulents de températures différentes. Génie mécanique [physics.class-ph]. Université de Valenciennes et du Hainaut-Cambrésis, 2012. Français. ⟨NNT : 2012VALE0016⟩. ⟨tel-03420716⟩



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