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Full-Text Articles in Engineering
Properties Of Titanium Dioxide Nanoparticles Aquesous Dispersions Stabilized By Anionic Surfactants, Anita Vuchkovska
Properties Of Titanium Dioxide Nanoparticles Aquesous Dispersions Stabilized By Anionic Surfactants, Anita Vuchkovska
Theses and Dissertations
The stability of titanium dioxide nanoparticles dispersed in aqueous solutions with and without anionic surfactants was investigated as a function of phase separation (sedimentation), particle size at the age of 33 and 303 days, polydispersity at 33 and 303 days, and zeta potential. Mechanical energy in the form of homogenization or mixing with propeller blade mixer was used to wet out the titanium dioxide (TiO2) nanoparticles in the aqueous media and this process was evaluated for the capability of developing a stable dispersion. The ultrasonic waves were used as a second step to form stable dispersions. The research results indicated …
Nanofiltration Membranes Made From Tppa-1 Covalent Organic Framework Nanofilms, Dalton Sendelbach
Nanofiltration Membranes Made From Tppa-1 Covalent Organic Framework Nanofilms, Dalton Sendelbach
Theses and Dissertations
Potable water scarcity is a problem growing more severe as water pollution continues to rise and the world population continues to grow. There are many techniques of treating water to remove contaminants and lower salt concentrations to drinkable levels, but there is still a great potential for more sustainable and energy efficient water treatment methods. The use of nanofiltration (NF) membranes appears to be a promising method for treating large quantities of water quickly and without using a lot of energy. Current nanofiltration membranes used for water treatment have not reached their full potential as they still have lower permeances. …
Computational Method To Analyze Novel Industrial-Type Compact Heat Exchangers Fin Designs, Oluwatosin Samuel Aworanti
Computational Method To Analyze Novel Industrial-Type Compact Heat Exchangers Fin Designs, Oluwatosin Samuel Aworanti
Theses and Dissertations
In this study, the computational fluid dynamics (CFD) method of numerical simulations has been applied to determine the heat load and pressure drop characteristics of computational method to analyze novel industrial-type compact heat exchangers fin designs. Two CFD software programs, Ansys Fluent and STAR-CCM+, were tested with air laminar flow. The research work demonstrated that Ansys Fluent is the more sensitive CFD software to laminar flow out of the two. Seven fin designs were tested to evaluate their performance in compact heat exchangers. The friction factor, f, and the Chilton Colburn factor, j, were used as the primary measures of …