Alireza Shams

Svante · Process Data Analytics & Operations Support

Rotating packed bed (RPB) is a novel process intensification technology that increases mass transfer rate using a strong centrifugal acceleration. Inside an RPB, the inlet jet of the liquid absorbent is broken into tiny droplets. It is reported that RPBs provide 11 times larger mass transfer area compared to equal‐sized packed beds and two to three...

Background As antibiotic resistance creates a significant global health threat, we need not only to accelerate the development of novel antibiotics but also to develop better treatment strategies using existing drugs to improve their efficacy and prevent the selection of further resistance. We require new tools to rationally design dosing regimens...

Motivation As antibiotic resistance creates a significant global health threat, we need not only to accelerate the development of novel antibiotics but also to develop better treatment strategies using existing drugs to improve their efficacy and prevent the selection of further resistance. We require new tools to rationally design dosing regimens...

Liquid crystals are self-organized viscoelastic materials with long-range partial orientational order. Imperfection in this order give rise to point, line, and wall defects whose dynamics and geometry reflect their anisotropic elasticity and viscosity. For line defects, confinement acts as an external field that affects defect dynamics and geometri...

The effect of global warming in Canada can be reduced to a greater extent by capturing CO2 from the exhaust of diesel generator. Many power plants in remote communities rely on diesel generators for electricity production, which emphasizes the importance of CO2 Capturing processes. Approximately 60-70% of the energy produced by these inefficient ge...

One of the relatively novel technologies to capture CO2 from the exhaust gas is based on cryogenic removal of CO2. Since the efficiency of Cryogenic Carbon Capture (CCC) process is defined as the amount of liquified CO2, the physical properties of CO2 at different operating pressures and temperatures can affect the process efficiency. The physical...

Some mycobacteria produce special types of surface substance during the growth phase that causes them to stick together in a parallel fashion way. In some infectious diseases, such as E. coli urinary tract infection and Tuberculosis, these ordered structures provide an important reservoir of cells that repopulate colonized sites upon removal of dru...

Some mycobacteria produce special types of surface substance during the growth phase that cause them to stick together in a parallel fashion way. In some infectious diseases, such as Tuberculosis [1], the ordered structure provides an important reservoir of cells that repopulate colonized sites upon removal of drug treatment. Understanding biostruc...

Metallic iron used in steel industries is mostly obtained from a direct reduction process. The focus of this study is to simulate the furnace of the MIDREX technology. MIDREX technology which is the most important gas-based direct reduced iron (DRI) process in the world, includes reduction, transition and cooling zones. The reduction zone considere...

Theory and modeling are used to characterize disclination loop-loop interactions innematic liquid crystals under capillary confinement with strong homeotropic anchoring. This defect process arises when quenching a mesogen in the isotropic phase into the stable nematic state. The texture evolution starts with +1/2 disclination loops that merge into...

Nematic Liquid crystals are self-organized viscoelastic materials with long range partial orientational order. Imperfection in this order give rise to point, line, and wall defects whose dynamics and geometry reflects their anisotropic elasticity and viscosity. For line defects confinement acts as an external field that affects defect dynamics and...

When a nematic liquid crystal is confined to a capillary tube with strong homeotropic anchoring conditions, unstable +1 disclinations lines can branch into a pair of +1/2 lines forming loops attached to the +1 axial line through branch points. The shape of the +1/2 disclination lines is a function of the confinement and the Frank elasticity. Our pr...

We present analysis, scaling and modelling based on a previously presented nonlinear nonlocal nematic elastica equation of disclination loop growth in nematic liquid crystals confined to conical geometries with homeotropic anchoring conditions. The +1/2 disclination loops arise during the well-known planar radial to planar polar texture transformati...

The combination of low elasticity modulus, anisotropy, and responsiveness to external fields drives the rich variety of experimentally observed pattern formation in nematic liquid crystals under capillary confinement. External fields of interest in technology and fundamental physics are flow fields, electromagnetic fields, and surface fields due to...

Biological Liquid crystals are self-assembled anisotropic soft materials which can be used in potential application such as optical compensator and biosensors. The texture properties of these materials including shape (curvature, torsion) and spatial characteristics (width of inversion walls, size of line cores) reflect the gradient elasticity and...

Liquid crystals (LCs) are self-organizing anisotropic viscoelastic soft materials that flow like viscous liquids and display anisotropies like crystals. When a nematic liquid crystal is confined to a capillary tube with strong anchoring conditions, disclination defects of higher (+1) and lower (+1/2) topological charges can coexist, connected throu...

Nematic liquid crystals (NLCs) under micron-range confinement exhibit a rich defect phenomenology that can be used to extract elastic (Frank moduli) material parameters of critical importance for next generation electro-optical devices. In this work we develop a model to predict defect-driven textural transformations that arise when a NLC is confin...

Defects in nematic liquid crystals under controlled confinement serve as a useful tool to characterize material properties as well as to reveal texture stability and pattern formation mechanisms in anisotropic soft matter. In particular, nematics inside micro-capillaries can exhibit a large variety of textures with point defects, line defects and l...

Lyotropic chromonic liquid crystals under capillary confinement display textural transformations between planar radial and planar polar modes, in which a +1 disclination branches into two +1/2 lines. The texture transformation is characterized by the nature and kinematics of the branch point, the aperture angle, and the shape of the lines. This wor...

In this paper we propose, Spectral method to solve unsteady gas equation which is a nonlinear ordinary differential equation on semi-infinite interval. These approaches are based on Modified generalized Laguerre functions. These methods reduces the solution of this problem to the solution of systems of algebraic equations. We also compare this work...

In this work, the development of a two-dimensional Direct Simulation Monte Carlo (DSMC) Program for pressure boundaries using unstructured cells and its applications to typical micro-scale gas flows are described. For the molecular collision kinetics, variable hard sphere molecular model and no time counter collision sampling scheme have been used....

This paper deals with simulation of transport phenomena in micro and nano pores. The number of cavities and the cavity radius were estimated by using Henry’s law for adsorption of Argon onto ZSM-5 and NaX zeolites. This work showed both of zeolites have pores with average size less than 1 nm. Then with using micro-nano channel assumption instead of...

This paper deals with the modeling and simulation of binary liquid-phase adsorption of methyl mercaptan and hydrogen sulfide from a liquid butane stream by zeolite molecular sieve 13X in a fixed bed. The model equations account for the effect of axial dispersion and the inter- and intraparticle mass-transfer resistances at isothermal operating cond...