Transfert thermique pour fluides non-newtoniens : cas du refroidissement de fluides de Herschel-Bulkley : aspects instationnaires

Abstract : We present here a numerical and experimental study of cooling with phase change taking account of time evolution. We have determined the dynamical and the heat transfer laws for non Newtonian thermodependent yield stress fluids in laminar regime, flowing through cylindrical duct. These thermodependant fluids are subjected to an external cooling with a constant heat transfer coefficient. We are interested in viscoplastic products for which the comportment law may be modelized by the formula. To solve numerically the governing equations, we have used ([oméga]-[psi]) and (u-v-p) formulations. The similarity of the results permits to privilege the (u-v-p) formulation. Experimentally, we have used a closed test loop to determine different parameters like: flow rate, wall temperatures, thickness of solid deposit. A stress controlled rheometer was used to obtain a precise determination of the rheological behaviour. Our research permits to point out the influence of: the external heat transfer coefficient (h[infinity]), the temperature of cold fluid(T[infinity]), the temperature of the fluid at inlet (Te) the flow rate (Q) and also of the thermodependancy parameter (bk ) on the thermal and dynamical fields.
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Theses
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http://docnum.univ-lorraine.fr/prive/SCD_T_1996_0174_JAVAHERDEH.pdf
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https://hal.univ-lorraine.fr/tel-01747237
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Submitted on : Thursday, March 29, 2018 - 10:55:28 AM
Last modification on : Friday, March 30, 2018 - 1:28:54 AM

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Koroush Javaherdeh. Transfert thermique pour fluides non-newtoniens : cas du refroidissement de fluides de Herschel-Bulkley : aspects instationnaires. Autre [cond-mat.other]. Université Henri Poincaré - Nancy 1, 1996. Français. ⟨NNT : 1996NAN10174⟩. ⟨tel-01747237⟩

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