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Computational fluid dynamics

Lehigh University

Publication Year

Articles 1 - 3 of 3

Full-Text Articles in Mechanical Engineering

Computational Study Of Desalination By Membranes, Mustafa Usta Aug 2018

Computational Study Of Desalination By Membranes, Mustafa Usta

Theses and Dissertations

Water desalination by membranes constitutes the majority of the low-quality water purication systems that extends across many different techniques. This study considers transport phenomena in reverse osmosis (RO) and vacuum membrane distillation (VMD) modules using computational techniques. Reverse osmosis is a pressure-driven separation method using semi-permeable membranes featuring nanoporous structures. Vacuum membrane distillation is another emerging separation method relying on the temperature difference across the microporous hydrophobic membranes.The membrane separation process intrinsically gives rise to temperature polarization (TP) and concentration polarization (CP) which could be severe limitations in these systems. To eliminate these polarizations and increase the module performance ...


Computational Study Of Gas Separation Using Membrane, Nawaf Yahya Alkhamis Jan 2015

Computational Study Of Gas Separation Using Membrane, Nawaf Yahya Alkhamis

Theses and Dissertations

Computational fluid dynamics simulations are conducted for multicomponent fluid flows in a channel containing spacers. The channel is bounded by membrane boundaries. A new and unique model has been presented for the treatment of the membrane boundaries in the separation of CO2 from CH4 in a binary mixture. The equation governing the flux through the membrane is derived from the first principle. The membrane is modeled as a functional surface, where the mass fluxes of each species will be determined based on the local partial pressures, the permeability, and the selectivity of the membrane. The approach introduced here is essential ...


Pulmonary Gas Transport And Drug Delivery In A Patient Specific Lung Model During Invasive High Frequency Oscillatory Ventilation, Mohammed Sabty Alzahrany Jan 2014

Pulmonary Gas Transport And Drug Delivery In A Patient Specific Lung Model During Invasive High Frequency Oscillatory Ventilation, Mohammed Sabty Alzahrany

Theses and Dissertations

The objective of this dissertation research was to investigate gas transport, mixing and aerosol-drug delivery during high frequency oscillatory ventilation (HFOV) for various ventilator specific conditions that are vital to critical care clinicians. A large eddy simulation based computational fluid dynamics approach was used in a patient specific human lung model to analyze the effect of invasive HFOV on patient management. Different HFOV waveform shapes and frequencies was investigated and the square waveform was found to be most efficient for gas mixing; resulting in the least wall shear stress on the lung epithelium layer thereby reducing the risk of barotrauma ...