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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.

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Showing 11 to 12 of 12 (0.112 seconds)

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11

Modeling in-situ vapor extraction during flow boiling in microscale channel

Salakij, Saran 25 March 2014 (has links)
In-situ vapor extraction is performed by applying a pressure differential across a hydrophobic porous membrane that forms a wall of the channel as a means of reducing the local quality of flow boiling within the channel. As the local quality is reduced, the heat transfer capability can be improve while large pressure drops and flow instability can be mitigated. The present study investigates the potential of vapor extraction, by examining the characteristics and mechanisms of extraction. The physics based models for transition among extraction regimes are developed which can be used as a basis for a regime-based vapor extraction rate model. The effects of vapor extraction on flow boiling in a microscale fractal-like branching network and diverging channels are studied by using a one-dimensional numerical model based on conservation of mass and energy, along with heat transfer and pressure drop correlations. The results show the improvement in reduced pressure drop and enhanced flow stability, and show the potential of heat transfer enhancement. / Graduation date: 2013 / Access restricted to the OSU Community at author's request from March 25, 2013 - March 25, 2014
Vapor extraction
Venting
Vapor separation
Two-phase flow
Flow boiling
Heat transfer
Regime map
Extraction map
One-dimensional model
Numerical model
Flow instability
Microfluidics -- Mathematical models
Ebullition -- Mathematical models
Vapors -- Mathematical models
Two-phase flow -- Mathematical models
12

Studie řešení protipovodňové ochrany části obce Janová na levém břehu Vsetínské Bečvy / Flood protection study of Janová urban neighbourhood situated on the left side of Vsetínská Bečva river

Böhm, Petr January 2012 (has links)
Diploma´s thesis solve flood protection study of Janova (region Vsetín). Model of flow was created based on geometry of the watercourse and hydrological data of Vsetinska Becva on the municipality. Model of flow was created using HEC-RAS 4.1. Calculation results of centenarian maximum peak discharge were base for design measures, which were the necessary for improvement flood protection of area.

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