فهرست مطالب ezzatollah joudaki

The purpose of this paper is to examine, predict and compare gas transport behavior of mixed matrix membranes (MMMs) combined with porous particles with different polymeric matrix. In this regard, composite flat sheet membranes are prepared from different amounts of poly(Polyvinyl alcohol) (PVA) and poly vinyl chloride (PVC) Gas permeability were studied for the prepared membranes. Then these membranes modelled were performed by Maxwell, and the results of Maxwell model with the experimental data were compared and the percentage of error was shown. Studied results showed that despite higher permeability emissions of carbon dioxide with PVC membrane grid with carbon nanotubes in the membrane of PVA but Maxwell model for PVA membranes without any additive as a polymeric membrane has provided more acceptable results.

One of the new separation methods for purifying biodiesel used in recent years is the membrane separation process. In the current research, purification of produced biodiesel was carried out using Polymeric Poly Ether Sulfone(PES) based membrane. The prepared PVP membranes was containing 1, 1.5, 2 and 3 wt.% of PVP concentration with 16 wt.% PES. as additive. Reported experimental determining the membrane flux and separation efficiency (glycerol rejection) membrane was modeled by Maxwell Model. The result, including penetration rate, theory graph and experimental data comparison for biodiesel and glycerin, and error graphs have been explained. Results showed that the experimental data’s have Compatibility with the model and, membrane with 2 percent PVP has provided more acceptable results.

Computational Fluid Dynamics (CFD) is a good numerical tools to solve complicated equations like fluid flows, heat transfer and chemical reactions such as flares issue. In this study, the effect of a changes in the flow rate on flare performance of one of Iran's oil refineries in actual mass flowrate range of 4,000 pounds per hour was calculated using CFD modeling, with Ansys Fluent software 16.0. Also its geometry and mesh designing were carried out by Gambit software 2.4.6. To investigate the effect of changes in flow rate on the flame temperature, flame length, profile of the concentration of combustion species and the turbulent stream pattern in the flame The related calculations are 2D in terms of axis symmetry in which the turbulence was modeled by standard k-ε, Non Premixed Combustion models, Simple Algorithm based on basic pressure and steady state condition were applied and also neglected the effects of the wind. By aid of independant variables from mesh, for actual mass flow ranges, we chose 68700 cells. The simulation results showed that although by changing the mass flow rate, in the range of 4000 pounds per hour does not change the maximum flame temperature. But changes the altitude that happens in this temperature. The length of flame varied in following situation, real mass flow was 14.9 meter which by %10 changes in mass flow, the length displaced 0.66 meter. Therefore, the rate of k (turbulence kinetic energy), ε (loss kinetic energy) increased by increasing the mass flow rate. The distribution of hydrogen and methane constituents in the range of the flame is equal to 1% molar and, with increasing massflow rate both distribution widespread and range of distribution of water and carbon dioxide is 5 and 10%, respectively both Concentrations increased by increasing the mass flow rate.