TY - JOUR
T1 - Edge fracture of thixotropic elastoviscoplastic liquid bridges
AU - Chan, San To
AU - Varchanis, Stylianos
AU - Shen, Amy Q.
AU - Haward, Simon J.
N1 - Funding Information:
We gratefully acknowledge the support of Okinawa Institute of Science and Technology (OIST) Graduate University with subsidy funding from the Cabinet Office, Government of Japan. We also acknowledge financial support from the Japanese Society for the Promotion of Science (JSPS) (Grants 21J10517, 21K03884, and 22K14184).
Publisher Copyright:
© The Author(s) 2023.
PY - 2023/3/1
Y1 - 2023/3/1
N2 - It has recently been shown that torsion can break liquid bridges of viscoelastic fluids, with potential application to their clean and rapid dispensing. However, many commonplace fluids (paints, adhesives, pastes, and foodstuffs like chocolate) have more complex thixotropic elastoviscoplastic (TEVP) properties that depend on the imposed stress and the timescale of deformation. Using a commercial thermal paste, we show that liquid bridges of TEVP fluids can also be broken by torsion, demonstrating the applicability of the technique for improved dispensing of real industrial fluids. The liquid bridge breaking mechanism is an elastic instability known as "edge fracture."Dimensional analysis predicts that the effects of thixotropy and plasticity can be neglected during edge fracture. Simulation using a nonlinear, phenomenological TEVP constitutive model confirms such a prediction. Our work yields new insight into the free-surface flows of TEVP fluids, which may be important to processes such as electronic packaging, additive manufacturing, and food engineering.
AB - It has recently been shown that torsion can break liquid bridges of viscoelastic fluids, with potential application to their clean and rapid dispensing. However, many commonplace fluids (paints, adhesives, pastes, and foodstuffs like chocolate) have more complex thixotropic elastoviscoplastic (TEVP) properties that depend on the imposed stress and the timescale of deformation. Using a commercial thermal paste, we show that liquid bridges of TEVP fluids can also be broken by torsion, demonstrating the applicability of the technique for improved dispensing of real industrial fluids. The liquid bridge breaking mechanism is an elastic instability known as "edge fracture."Dimensional analysis predicts that the effects of thixotropy and plasticity can be neglected during edge fracture. Simulation using a nonlinear, phenomenological TEVP constitutive model confirms such a prediction. Our work yields new insight into the free-surface flows of TEVP fluids, which may be important to processes such as electronic packaging, additive manufacturing, and food engineering.
KW - edge fracture
KW - flow instability
KW - rheology
KW - thixotropy
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U2 - 10.1093/pnasnexus/pgad042
DO - 10.1093/pnasnexus/pgad042
M3 - Article
AN - SCOPUS:85164291014
SN - 2752-6542
VL - 2
JO - PNAS Nexus
JF - PNAS Nexus
IS - 3
M1 - pgad042
ER -