Other Chemical Engineering Commons^™

Asset Management Model For An Industrial Process Automations System In The Chemical Engineering Unit Operations Laboratory At Rose-Hulman Institute Of Technology, Megan Elaine Liebman

Graduate Theses - Chemical Engineering

In the Chemical Engineering curriculum, the Unit Operations (UO) Laboratory is recognized as the place where hands-on exposure to industrial practices occurs. Students not only examine fundamental engineering principles, but also gain knowledge of the intricacies of modern control technology. The UO Laboratory at Rose-Hulman Institute of Technology houses an industrial state-of-the-art distributed control system, which operates eleven large-scale experiments and interfaces with approximately two hundred process instruments. The size and complexity of the distributed control system and its associated equipment have grown over the past ten years and have reached a point where a systematic asset management approach is …

The Effect Of Assembly Technique On Weak Polyelectrolyte Multilayer Film Morphology And Humidity Swelling/Deswelling Behavior, Ziyang Yin

Graduate Theses - Chemical Engineering

The goal of this research is to investigate the film morphology and humidity swelling/deswelling behavior of polyelectrolyte multilayers (PEMs) that are constructed from poly(allylamine hydrochloride) (PAH) and poly(acrylic acid) (PAA) by two assembly techniques: automated dipping layer-by-layer (LbL) and spin-assisted (SA) LbL. Two sets of pH polyelectrolyte solution conditions were tested: (PAH7.5/PAA3.5) and (PAH7.0/PAA7.0). It was found that when the films were constructed with the same number of bilayers (=20 bilayers), SA-LbL (PAH7.5/PAA3.5) has a greater thickness than (PAH7.0/PAA7.0). (PAH7.5/PAA3.5) thin films constructed by automated dipping LbL did not result in a uniform film morphology, making thickness comparisons between techniques …

Combining Monte Carlo Transport And Level Set Surface Evolution For Modeling Vapor Phase Deposition Of Thin Films Over Sub-Micron Features, John Lewis Smith

Graduate Theses - Chemical Engineering

A hybrid scheme is used to model the vapor phase deposition of thin films at the feature scale. The transport of the chemical species to the substrate surface is modeled with a Collisionless Direct Simulation Monte Carlo (DSMC) method. The Level Set Method is used to model the growth of the thin-film on the substrate. The convergence criteria for these methods were not found in literature.

The governing equations for the Level Set Method are, in general, non-linear partial differential equations. The coupling of the DSMC Method with the Level Set Method results in a set of non-Gaussian stochastic non-linear …