Effect of substrate cooling and droplet shape and composition on the droplet evaporation and the deposition of particles
Vahid Bazargan, Ph.D. Thesis: Department of Mechanical Engineering, The University of British Columbia, March 2014, © Vahid Bazargan, 2014
Sessile droplets are liquid droplets resting on a flat substrate. During the evaporation of small sessile droplets, the contact line of the droplet undergoes two different stages: pinned stage with fixed contact area and de-pinned stage with fixed contact angle. An evaporation with a pinned contact line produces a flow inside the droplet toward the contact line. This flow carries particles and deposits them near the contact line. This causes the commonly observed “coffee-ring” phenomenon. This thesis provides a study of the evaporation process and the evaporation-induced flow of sessile droplet and brings insights into the deposition of particles from colloidal suspensions.
Modeling fish passage and energy expenditure for American shad in a steeppass fishway using a computational fluid dynamics model
Kathryn Elizabeth Plymesser, Ph.D. Thesis: Montana State University, January 2014, © Kathryn Elizabeth Plymesser, 2014, All Rights Reserved.
The Alaska steeppass is a fishway used extensively in the eastern U.S. and in remote locations. The baffles in the steeppass fishway tend to reduce water velocity to magnitudes negotiable by many species. A computational fluid dynamics (CFD) model was developed for common combinations of fishway slope and head pond elevation. Three-dimensional hydraulics information from the CFD model was used as a basis to predict passage success for American shad in the steeppass. The passage model considered six unique algorithms for swim path during ascent, and both the optimal swim speed approach of Castro-Santos (2005) and newly developed swim-speed information based on the laboratory study of Haro, Odeh, Castro-Santos, and Noreika (1999).
Modeling in a three-dimensional world: whitewater park hydraulics and their impact on aquatic habitat in Colorado
Eleanor Kolden, Thesis: Master of Science, Civil and Environmental Engineering, Colorado State University. Full thesis available online at Colorado State University.
Whitewater parks (WWPs) are becoming more popular in Colorado rivers and streams, but the effects of WWPs on aquatic habitat and fish passage are poorly understood. This study investigated the use of a three-dimensional (3-D) hydrodynamic model (FLOW-3D) for assessing effects of WWPs on aquatic habitat. The objective of this study was to compare modeled habitat quality to actual fish biomass and to examine the utility of 3-D modeling (vs. two-dimensional (2-D) modeling) in this hydraulically-complex system. Two sections of a small river in Colorado were modeled: one natural section, and one section containing a WWP with three engineered drop structures.
Application of computational transport analysis – Oil spill dynamics
Aditi Verma, Master’s Thesis: State University of New York at Buffalo, 2016, 56 pages; 1012775
Transport phenomena of one form or another, e.g., fluid dynamics, heat and mass transfer etc. are the fundamental underlying mechanisms that govern many chemical engineering processes. The rational design of practical applications typically requires the solution of complex coupled equations that cannot be solved analytically. Instead, numerical analysis is usually used for design and optimization. Computational fluid dynamics (CFD) is the method of choice for such analysis. In this thesis we use CFD to analyze complex and large scale transport phenomena that govern the dynamics of an off-shore oil spill. Specifically, we study the spill of oil from a drilling platform that is tethered to the sea floor off-shore from a land mass. We use a state-of-the-art multiphysics CFD program, FLOW-3D, to study the spread of oil taking into account key phenomena and factors including water-oil two-phase flow, spill rate, properties of different oil grades and fluid structure interactions as the platform is rocked under the influence of varying wave conditions.