TY - JOUR
ID - 5355
TI - Modeling the droplet break-up based on drawing the shape using velocity gradient and normal vector
JO - AUT Journal of Mechanical Engineering
JA - AJME
LA - en
SN - 2588-2937
AU - Heydarpoor, Saleh
AU - famili, navid m
AD - Tarbiat Modares University
AD - tarbiat modares university
Y1 - 2024
PY - 2024
VL - 7
IS - 3
SP - 4
EP - 4
KW - viscous matrix
KW - shear field
KW - droplet deformation
KW - drawing the droplet shape
DO - 10.22060/ajme.2024.22348.6061
N2 - The present study developed a model to deform a viscous droplet in a viscous matrix by a shear flow based on changing the normal vector. The initial cross-section was assumed to be a regular polygon with 1000 sides instead of a circle or ellipsoid, and also this model was independent of the initial polygon shape. Changing the normal vector and the length of each side of the droplet was a function of the velocity gradient. To calculate the velocity gradient over each side of the shape, the equations of tangential and normal stress, the conservation of mass equation, and the absence of mass transfer equation between two phases were solved simultaneously. By knowing the velocity gradient, normal vectors and the length of each side are calculated; therefore, the new shape can be plotted by drawing sides one after another. Then, four series of parameters were used for the simulation of the deformation of the droplet and its break-up. The results displayed that the time of the break-up, which this model predicts, coincides with the experimental results. On the other hand, the predicted shape of the droplet at the break-up has logically coincided with the experimental results in the middle range of the Capillary number ratio (1.4 Cac-2.6 Cac). This model could calculate the velocity gradient and velocity profile over and around the droplet.
UR - https://ajme.aut.ac.ir/article_5355.html
L1 - https://ajme.aut.ac.ir/article_5355_9d1771e1496723eac50a1d505ecae26a.pdf
ER -