Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Rheology of oil-in-water silicone oil emulsions
Submission Author:
Lucas Dondoni Reinock , ES
Co-Authors:
Lucas Dondoni Reinock, Enza Zanon, Giuliano Pereira Sardi, Luiz Henrique Rohr Scherrer do Vale, Lucas Antônio Silveira Silva, Michel de Oliveira dos Santos, Edson Soares, Bruno Loureiro
Presenter: Michel de Oliveira dos Santos
doi://10.26678/ABCM.COBEM2023.COB2023-2073
Abstract
Emulsions are found in numerous industrial sectors, such as pharmaceuticals, food, cosmetics, petroleum, among others. Due to their widespread applications, understanding the rheological properties of this type of fluid is of utmost importance due to their direct influence on industrial processes. In terms of emulsion rheology, it is understood that the rheological behavior is dependent on different conditions, such as the concentration of the dispersed phase and droplet size distribution. In this study, oil-in-water (o/w) emulsions with large droplet sizes (D90 approximately 80 µm) and low concentrations of synthetic silicone oil were analyzed. Due to the large droplet sizes, these emulsions did not exhibit significant temporal stability. However, in scenarios where droplet size is more critical than stability, this configuration can be interesting. The study evaluated the rheological behavior of emulsions, examining dependencies of viscosity on shear rate and shear time. Additionally, a comparison was made between rheometric tests and analytical models proposed in the literature to assess emulsion viscosity. As a complementary analysis, the presence of droplet breakage or coalescence during flow in the rheometer was investigated. Based on the results obtained, it was observed that the analyzed emulsions exhibit simultaneous rheopetic and pseudoplastic behavior. Furthermore, there was no tendency for droplet breakage or coalescence during the flow. These findings provide valuable insights into the rheological characteristics and stability of the studied emulsions, which are crucial for various industrial applications.
Keywords
Emulsion, Rheology, oil-in-water, viscosity, silicone oil
