TY - JOUR
T1 - Droplet pinch-off with pressure fluctuations
AU - Zhu, Pingan
AU - Wang, Liqiu
N1 - Funding Information:
The financial support from the Research Grants Council of Hong Kong ( CRF C1018-17G , GRF 17204718 , 17237316 , 17211115 and 17207914 ) and the University of Hong Kong ( URC 201511159108 , 201411159074 , and 201311159187 ) is gratefully acknowledged. This work was also supported in part by the Zhejiang Provincial , Hangzhou Municipal , and Lin’an County Governments .
Funding Information:
The financial support from the Research Grants Council of Hong Kong (CRF C1018-17G, GRF 17204718, 17237316, 17211115 and 17207914) and the University of Hong Kong (URC 201511159108, 201411159074, and 201311159187) is gratefully acknowledged. This work was also supported in part by the Zhejiang Provincial, Hangzhou Municipal, and Lin'an County Governments.
Publisher Copyright:
© 2018 Elsevier Ltd
PY - 2019/3/16
Y1 - 2019/3/16
N2 - Dynamics of Newtonian fluid pinch-off is universal, excluding the possibility of manipulating pinch-off behavior by varying initial and boundary conditions which is desirable in applications such as inkjet printing and microfluidics. Here we show that the dynamics of two-fluid pinch-off with disturbed inlet pressure (such as the profile of the conical liquid neck, cone slope, and neck thinning rate) depends on initial perturbations. The nonuniversality arises from pressure-fluctuation-induced nonlocal flow velocity that stretches the axial length scale of the pinch-off region. We renormalize the disturbed pinch-off using the linear ratio, (1 + βε), with β being the empirical constant and ε the dimensionless pressure fluctuation. We further apply the pressure fluctuation in engineering pinch-off where the disturbed and undisturbed systems have identical pinch-off dynamics but distinct material properties. Our results could provide useful guidelines for controlling the breakup of liquid threads with extreme physical properties, such as ultrahigh viscosity and ultralow interfacial tension, in inkjet printing and microfluidics for a range of applications.
AB - Dynamics of Newtonian fluid pinch-off is universal, excluding the possibility of manipulating pinch-off behavior by varying initial and boundary conditions which is desirable in applications such as inkjet printing and microfluidics. Here we show that the dynamics of two-fluid pinch-off with disturbed inlet pressure (such as the profile of the conical liquid neck, cone slope, and neck thinning rate) depends on initial perturbations. The nonuniversality arises from pressure-fluctuation-induced nonlocal flow velocity that stretches the axial length scale of the pinch-off region. We renormalize the disturbed pinch-off using the linear ratio, (1 + βε), with β being the empirical constant and ε the dimensionless pressure fluctuation. We further apply the pressure fluctuation in engineering pinch-off where the disturbed and undisturbed systems have identical pinch-off dynamics but distinct material properties. Our results could provide useful guidelines for controlling the breakup of liquid threads with extreme physical properties, such as ultrahigh viscosity and ultralow interfacial tension, in inkjet printing and microfluidics for a range of applications.
KW - Droplet microfluidics
KW - Nonuniversality
KW - Pinch-off
KW - Pressure fluctuations
UR - http://www.scopus.com/inward/record.url?scp=85056724934&partnerID=8YFLogxK
U2 - 10.1016/j.ces.2018.11.016
DO - 10.1016/j.ces.2018.11.016
M3 - Journal article
AN - SCOPUS:85056724934
SN - 0009-2509
VL - 196
SP - 333
EP - 343
JO - Chemical Engineering Science
JF - Chemical Engineering Science
ER -