Numerical Investigation of a Viscoplastic Fluid Bubble Removal: a New Correlation to Find the Degassing Process Parameters

Abstract

The undesirable presence of the gas bubbles negatively affects the expected properties (strength, molding and etc.) of a liquid polymer in some industrial products. Therefore, the development of the degassing methods is becoming an important industrial issue. The vibration is one of the most effective degassing approaches but still little researches have published in order to improve this method characters. The current study has investigated the rheological and thermophysical properties of a non-Newtonian polymer liquid in the bubble removal process to find the optimum properties of vibration. Therefore, a mathematical correlation has attained between the vibration and a non-Newtonian fluid properties. Also, the results show that in a viscoplastic fluid, the vibrational deflation ratio is slightly sensitive to the yield stress and by increasing the fluid surface tension from 0.03 to 0.07 N/m, the vibration bubble-desalination ratio increases by 10.6 times. As well as decreasing the fluid stability index from 0.30 to 0.50 results the increase in the bubbling ratio by 14.47%. However, by increasing the flow index from 0.30 to 0.50, due to the decrease in fluid thinning property, the final bubble velocity decreases by 48.27%.