The goal was to increase spatial uniformity of gas flow field injected onto a substrate in a AP-PECVD process. I proposed a novel type of tubular injector with an auxiliary inner showerhead and performed a CFD analysis to demonstrate the effects of various design parameters and operating conditions in terms of vorticity and local Reynolds…
I optimized a dielectric barrier discharge (DBD) reactor in terms of selectivity, deposition rate and product yield. I designed a hybrid model coupling a 2D stationary model of the deposition reactor to the 1D time-dependent plasma equations. The optimization results, presented in the form of ternary plots, offer industrial applicability and ease of interpretation.
The aim was to use a 2D Direct simulation Monte Carlo method to simulate a pressure-driven flow of dilute, monoatomic gas through an orifice.
This is a complete collection of materials for the Process Analysis and Design class, that I taught at Florida State University in 2010-2012. The archive includes lecture notes, homework problems, exams and quizzes. The topics covered include: Linear Equations & Matrix Algebra Vector Spaces & Classical Least Squares Determinants & Cramer’s Rule Eigenvalues and Eigenvectors…
Fundamental solutions of Stokes equation in bounded domains are unwieldy and computationally-intensive, therefore of limited practical use compared to numerical solutions. Nevertheless, specific applications may benefit from their use, and we found no published record of a Stokes flow Green’s function for a rectangular domain. Therefore we developed a semi-analytical form of this fundamental solution…
To complement the research into phase-space kinetic theory of polymer solutions I turned again to computer simulations, specifically to Brownian dynamics of DNA electrophoresis under pressure-driven flow in micro-channels. In contrast to the majority of similar studies reported in the literature, I included electrically-induced hydrodynamic interactions, yielding uniformly valid solutions for small Debye lengths.I classified…
I extended the kinetic theory of dilute polymer solutions under external fields to include finite-chain extensibility, and to properly account for wall-inducedhydrodynamic interactions. I developed formulas for the scaling of the depletion layer with the Peclet number and for the variation of molecular stretch and normal stresses; I also derived migration tensors for the Green’s…
During my early PhD studies I focused on molecular dynamics simulations of DNA in Gromacs and an efficient implementation of multigrid methods. Later, I started developing a C++/Fortran code to model the transport of biomolecules in micro-devices under elektrokinetic flows. I developed anovel hybrid method that combines Langevin dynamics for a bead-spring DNA model, and…
This work focused on the theoretical analysis of a prototype device for dielectrophoretic particle separation reported in the literature. Motivated by the effort to minimize the number of adjustable parameters used by the original authors, I quantified the electrophoretic, dielectrophoretic and electroosmotic effects more precisely using a multipole expansion. For details, see the appendix of…
A simple wooden pergola with traditional style, i.e. angled braces (mortise-and-tenon) and rafters fitted with double-shouldered center laps.
