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Mechanical Engineering

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Surface tension

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Full-Text Articles in Engineering

Impinging Jet Flow And Hydraulic Jump Of Newtonian And Viscoplastic Liquids, Wenxi Wang Sep 2023

Impinging Jet Flow And Hydraulic Jump Of Newtonian And Viscoplastic Liquids, Wenxi Wang

Electronic Thesis and Dissertation Repository

The steady laminar incompressible flow of an axisymmetric impinging jet of either a Newtonian fluid or a viscoplastic fluid of the Heschel-Bulkley type and the hydraulic jump of either a circular or polygonal shape on a solid disk is analyzed. The polygonal jump is induced by azimuthal dependence edge conditions: a non-circular disk or a circular disk with a variable edge film thickness. The thin-film and Kármán–Pohlhausen approaches are utilized as theoretical tools.

To cross the jump smoothly, a composite mean-field thin-film approach is proposed. The stress singularity for a film freely draining at the disk edge is found to …


Studies In Shallow And Thin-Film Flows, Md Mahmuder R. Faisal Oct 2012

Studies In Shallow And Thin-Film Flows, Md Mahmuder R. Faisal

Electronic Thesis and Dissertation Repository

The present study examines the influences of surface tension and wind direction in shallow or thin-film flow with the inclusion of inertial effect. In this present study starting with the fundamental equations (conservation of mass and momentum), an analytical method is introduced to determine the bottom stress at different position of a shallow or thin-film flow domain under the influence of oscillatory wind conditions. The novelty of this study is that the viscous and surface tension effects are considered in this study, whereas in most of the existing studies in a shallow or thin-film flow domain (a shallow tailings pond) …


Improved Non-Linear Solution Of Dip Coating Flow, Omar Bin Yusuf Aug 2012

Improved Non-Linear Solution Of Dip Coating Flow, Omar Bin Yusuf

Electronic Thesis and Dissertation Repository

A thin layer of film is developed on the surface of a substrate in the dip coating process where the substrate is initially immersed into the coating fluid and then withdrawn continuously from the coating fluid bath. In this study a two dimensional flow of the thin film for a Newtonian fluid is examined theoretically by dividing the film into three separate regions. A general formulation is developed for a thin film flow, which then simplifies for each region upon considering appropriate assumptions to each region. The influence of inertia and surface tension in the presence of gravity is investigated …