| Popis: |
It is about an experimental and theoretical study on the thermal transfer by forced convection during a laminar flow through a cylindrical pipe to constant parietal flow, on a non-Newtonian fluid which is the Carboxymethylcellulose of Sodium, with various concentrations (0.5 %, 0.8 %, 1 % and 1.5 %) ([Lachemet, 1977]), various diameters (8 mm, 10 mm and 12 mm) and a length of the cylindrical path of contact equal to 2 m. For this study, cylindrical pipe was wrapped up in an electric resistance in order to heat the front suspension on various temperatures (20 °C, 40 °C, 50 °C, 60 °C,70 °C). A thermo-rheological study ([Sacadura, 1995]) was made on the suspension, giving the rheological model to which it obeys (Oswald relationship), an analysis on the change of the temperature and the number of Nusselt according to the length of the cylindrical path of contact were carried out ([Taine & al, 2009]). The results obtained show that the transfer of heat is better if the temperature is increased. Therefore a comparative study was made on two cylindrical pipes insulated differently, one using glass wool and the other using rubber foam. |
