The study of the effect of concentration of the agar-agar solution on the Rheological and thermo rheological behaviour

: The purpose of this work is to study the parameters that influe the rheological behavior of a complex fluid (agar agar solution), on a capillary remoter., the rheological properties of agar solution were studied, in particular the concentration's effect (0,1%, 0,15%, 0,17%, 0,2%), and temperature (20°C, 30°C, 40°C, 50°C, 60°C, 70 °C) on the rheological behavior of the agar solution. A comparative study of various rheological laws (Herschel-Buckley, Cross, Oswald De Waele, Bingham) was made, to establish a model that presents the rheological behavior which applies to different samples of agar solution, based on the coefficient of correlation. Results indicated that the rheological behavior of agar solution depends on the range of shear rate used: for low shear rate (lower than 6.2 s -1 ) the solution of agar can be modeled by an Ostwald-De Waele-type power-law, but for the high shear rate (higher than 6.2 s -1 ) the solution of agar can be described by Bingham's model. The concentration's and temperature's effect of agar solution on the two models studies’ parameters (Ostwald-De Waele, Bingham) was studied.