The experimental investigation shows that suspension droplets with discontinuous shear thickening exhibit a hardened deformation mode when they fall into the airflow field. A dimensionless number N is proposed to describe the relative magnitude of the increment of viscous force and aerodynamic force during the secondary breakup process. It is also suggested to use N and the Weber number We to establish a secondary deformation and breakup regime map for Newtonian fluids and DST suspensions.
To explore the effect of shear thickening behavior on the secondary deformation and breakup of cornstarch-water suspension droplets, an experimental investigation is conducted by using a high-speed camera. The experimental results demonstrate suspension droplets that exhibit discontinuous shear thickening (DST) exhibit a hardened deformation mode when they fall into the airflow field. When the droplets are in a hardened deformation mode, the windward side of the droplet deforms into a sheet, while the leeward side remains hemispherical until the droplet leaves the airflow field. The dimensionless number N is established to describe the relative magnitude of the increment of the viscous force and aerodynamic force during the secondary breakup process. Based on the suggested dimensionless number N and the Weber number We, the secondary deformation and breakup regime map of Newtonian fluids and DST suspensions is also proposed.
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