The breakup dynamics of a capillary bridge on hydrophobic stripe between two hydrophilic stripes is studied experimentally and numerically using direct numerical simulations. formed from an evaporating water droplet wetting three neighboring chemically patterned surface. By considering the process in phase space representation, can be evaluated without uncertainty determining precise time. simu...

Since typical industrial-scale reactors may contain many millions of bubbles, the extension of direct free-surface modelling techniques to resolve every bubble in the vessel would require far more computational power than will be available. A more immediate solution is to couple macro-scale reactor models to micro-scale models of individual bubbles and collections of a small number of bubbles. ...

Nano imprint lithography(NIL) is a cost-efficient, highthroughput processing technique to transfer nano-scale patterns onto thin polymer films. Polymers used as the resist include UV cured resins as well as thermoplastics such as polymethyl-methacrylate(PMMA). In this study, an analytic investigation was performed for the NIL process of transferring nano scale patterns onto polymeric films. Pro...

Two-phase flows with dynamic interfaces are ubiquitous in daily life as well as in many industrial applications. Gas bubbles and liquid droplets are typical forms of these twophase flows. In chemical engineering, understanding the dynamics of these bubbles and droplets is crucial to the design and operation of the two-phase flow reactors, ranging from microfluidic devices to large systems such ...

We present a novel numerical method to solve the incompressible Navier-Stokes equations for two-phase flows with phase change. Separate phases are tracked using geometric Volume-Of-Fluid (VOF) piecewise linear interface construction (PLIC). Thermal energy advection is treated in conservative form and calculation of VOF fluxes at computational cell boundaries used consistently calculate heat cap...

This paper focuses on the implementation, validation and exploitation of a vertical dropshaft flow operation using the commercial VOF-based Computational Fluid Dynamics (CFD) code, FLOW-3D ® . Using the experimental data of Chanson (2002), the package was used to simulate the flow patterns in a rectangular dropshaft with plunge-flow pattern. Both k−ε and k−ε RNG turbulence closures were tested ...

Original scientific paper Tsunami is one of the serious natural disasters in the world, which produce huge horizontal thrust on costal buildings, resulting in a large number of houses collapsed instantaneously, causing serious casualties and economic losses. In this paper, based on support from the hydrodynamic software FLOW-3D, the method of Volume of Fluid (VOF) is utilized to capture free in...