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Simultaneous measurements of velocity and temperature by non-intrusive optical methods in a complex geometry : Application to the upper plenum of the sodium cooled reactor ASTRID

Abstract : Thermal hydraulic problems of the upper plenum of ASTRID cannot be studied from the feedback of the reactors and the numerical simulations since the codes do not make it possible to model these problems with a sufficient confidence. To validate the numerical approaches and the design of ASTRID, needs have been identified for experimental models. The representative MICAS model of the upper plenum has been designed for this purpose. To validate the numeric codes, the velocity and temperature fields are mustbe measured. While PIV technique is frequently used at the LTHC, the LASER Induced Fluorescence (LIF) method required development and implementation. The principle of LIF is based on the spontaneous emission of photons by the molecules of a tracer, as a result of the absorption of laser radiation. LIF calibration experiments with a dye were performed to study their fluorescence response. The LIF with two dyes is very interesting too. PIV and LIF with two dyes are applied on a new experimental installation (complex geometry with two jets) conceived during this thesis in order to allow a representative of the model MICAS.
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Mira Chitt. Simultaneous measurements of velocity and temperature by non-intrusive optical methods in a complex geometry : Application to the upper plenum of the sodium cooled reactor ASTRID. Mechanics [physics.med-ph]. Université Paris Saclay (COmUE), 2019. English. ⟨NNT : 2019SACLS598⟩. ⟨tel-02534247⟩

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