Featured Theses

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

Substrate of cooling and droplet shapeSessile 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.

Download

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.

Fish passages for American shadThe 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).

Download

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.

White water park hydraulicsWhitewater 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.

Download