Normal and oblique drop impact of yield stress fluids with thixotropic effects

Autor(es)

Oishi, Cassio M. ^[1] ; Thompson, Roney L. ^[2] ; Martins, Fernando P. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Paulista, Dept Matemat & Comp, Fac Ciencias & Tecnol, BR-19060900 Presidente Prudente, SP - Brazil

^[2] Univ Fed Rio de Janeiro, Dept Mech Engn, Ctr Tecnol, COPPE, Ilha do Fundao, BR-24210240 Rio De Janeiro, RJ - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF FLUID MECHANICS; v. 876, p. 642-679, OCT 10 2019.
• Citações Web of Science: 0

Resumo

Normal and oblique drop impact on a solid surface is numerically analysed for yield stress fluids. A rich diversity of results are generated as a consequence of the exploration of the inertial, elastic, plastic and thixotropic features of the process, as well as the inclination of the solid surface. We show that drops of more thixotropic fluids have a higher tendency to bounce in the normal impact, and to roll or to bounce in the case of an oblique drop impact. Concerning elasticity, we found a critical value for the elastic Ohnesorge number above which no bouncing takes place. Experimental findings such as the fact that the stored energy due to the elasticity of the fluid drop plays a role similar to the stored energy of an interfacial nature in inelastic fluid drops are corroborated in the present study. (AU)

• Processo FAPESP: 13/07375-0 - CeMEAI - Centro de Ciências Matemáticas Aplicadas à Indústria
• Beneficiário: Francisco Louzada Neto
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs