"Thermal-burst modeling of a double-diffusive ""diffusive"" interface"

"The operation of a double-diffusive ""diffusive"" interface may be characterized by three regimes: quasi-steady entraining (often called the variable regime), quasi-steady non-entraining (often called the constant regime), and transient. Using a thermal burst modeling approach, new models have been developed for the quasi-steady entraining regime and the transient regime. The thermal burst theory proposes that the interface boundary layers become unstable and periodically break away due to the differing component diffusion rates. The quasi-steady entraining model assumes a thin interface where each burst entrains fluid up to the limit of neutral buoyancy. This entrainment assumption fixes the flux ratio at one and predicts normalized flux rates which are in generally good agreement with experimental data. The transient model assumes a thick interface with independent boundaries. There is no entrainment, but the boundary is reestablished after each burst at the point of neutral buoyancy. This assumption allows the model to predict interface growth and erosion rates. The transient model has been implemented in a finite difference simulation which has been used to recreate interface growth and erosion observed in experiments lasting as long as two weeks."

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Mechanical Engineering

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2011

Author dc:creator

• Witte, Michael James

Contributors dc:contributor

• Newell, Ty A.

• Engineering, Mechanical

Statement dc:rights

• Copyright 1989 Witte, Michael James

Language dc:language

eng

Identifier

AAI8924972
(UMI)AAI8924972

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/20808