Coalescence of Viscoplastic Filaments

We show how yield stress dictates the final shape of gently deposited elastoviscoplastic filaments on a surface. We first briefly present the results of a single filament deposition on a pre-wetted surface for a range of yield stress and the deposition flow rate. We will then present the dynamics and final shape of two viscoplastic filaments. We show that they merge when the distance between the filaments is smaller than a critical value. The final shape of these coalesced filaments is governed by multiple factors, mainly the competition between yield stress and surface tension.