Details

Autor(en) / Beteiligte

• Louanate, Amal
• Otmani, Rabie El
• Kandoussi, Khalid
• hamed Boutaous, M

Titel

Characterization of the rheological behavior of a paraffin-based phase change material under steady and oscillatory shear

Ist Teil von

• Thermochimica acta, 2021-10, Vol.704, p.179018, Article 179018

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2021

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Solid-liquid phase change materials (PCMs) behavior has been extensively discussed through a set of numerical and experimental investigations. In the current numerical models, natural convection dominated melting is often neglected due to a lack of experiments aiming to characterize the PCM behavior during the melting state. However, it was observed that ignoring this phenomenon causes a large difference between numerical results and experimental data. Hence, natural convection has to be accounted in order to correctly describe the physics encounter in the phase change, especially during melting process. Since natural convection phenomenon depends on the PCM viscosity, the rheological behavior of PCMs should be evaluated properly. In this study, the rheology of RT25, one of the frequently used phase change materials in domestic comfort services, has been described using a Kinexus Lab Rotational Rheometer. Both rotational and oscillatory methods have been used to measure the zero-shear viscosity and the dynamic viscosity which are important parameters of CFD simulations. The Newtonian behavior of RT25 was also demonstrated through dynamic frequency sweep measurements. Moreover, influence of several parameters on the rheological properties has been analyzed.