BOUNDARY ELEMEN METHOD FOR BREAKING UP PROCESS IN VISCOELASTIS FLUID

• Main Author: Wahidah A K (NIM 20105013), A
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/5814
• Institution: Institut Teknologi Bandung

ABSTRACT: <br /> <br /> <br /> <br /> <br /> The process of deformation of Non-Newton (viscoelastic fluid threadgoes through with droplet can be investigated by using analytical and numerical solution. This viscoelastic thread in area of Newton fluid and both of the fluids are assumed axissymetric and immiscible. The chosen viscoelastic model is linear model of Maxwell fluid. This model declares that elastic property of fluid can be represented by time relaxation parameter. In this case, we can investigate the deformation process by means of numerical approach using Boundary Element Method. In the manner of investigation of dynamics of interface of thread, time needed by thread to deform be droplet can be predicated. Boundary Integral Equation is determined from nonhomogeneous Stokes equation and Non-Newton strain tensor equation are treated as source of Stokes equation that yields additional integral in Non-Newton material domain. In domain integral representation, we use Gauss Divergence method such that the dimension in this case is reduced from three to two dimensions.