The suitability of three vapor deposition techniques for pore size modification was evaluated using polycarbonate track etched membranes as model supports. A feature scale model was employed to predict the pore geometry after modification and the resulting pure water flux. Physical vapor deposition (PVD) and pulsed plasma-enhanced chemical vapor deposition (PECVD), naturally, form asymmetric na...

release  volatile  organic  compounds  (vocs)  as  environmental  and  occupational  pollutant  cause  macro perspective affect such as climate change, humans and economic consequences. although fixed bed absorber is widely used as a controlling method because of its economically and availability, but these absorbers are facing some issue like high pressure drop, non-uniform distribution of flu...

A fluidized bed is being studied as a very promising method for mass production of IFE targets. Large beds could be filled with many targets to provide large-scale production, while a near-isothermal environment could be maintained in principle around each target (as required for smooth layering to meet the physics requirements on the ice characteristics) through the random movement and spin of...

A carbon nanotube (CNT) is a miniature cylindrical carbon structure that has hexagonalgraphite molecules attached at the edges. Nanotubes look like a powder or black soot, but they'reactually rolled-up sheets of graphene that form hollow strands with walls that are only one atom thick.Carbon nanotube has been one of the most actively explored materials in recent year(s) due to...

In this study, thermochemical biomass gasification was performed on a bench-scale fluidized-bed gasifier with steam and air as fluidizing and oxidizing agents. Distillers grains, a non-fermentable byproduct of ethanol production, were used as the biomass feedstock for the gasification. The goal was to investigate the effects of furnace temperature, steam to biomass ratio and equivalence ratio o...

T he concept of chromatography in Expanded Bed Adsorption (EBA) was first proposed in early 90s. The initial advantage of the idea was to be able to directly process particulate containing biological feedstocks for target products, while still maintaining sufficiently high separation efficiency that is usually enjoyed only by the traditional chromatography columns. EBA could potentially replace...

We examine, using (211)-dimensional Monte Carlo simulations, the roughening behavior of a reemission model for chemical vapor deposition. We find that, for pure first-order reemission, the interface roughens logarithmically with time and that the scaling exponents are, for most sets of conditions, close to the exponents of the Edwards-Wilkinson model (a50, b50, and z52). We compare our results ...

Changes in the physical properties (such as particle density, bulk density of the bed, shrinkage and bed porosity of fresh green peas particulates were compared at 50 o C, during fluidized bed drying and fixed bed drying. Empirical relationships of the following nature were developed for the changes in shrinkage [VR = A + B MR], particle density [ρ p = A + B MR + C exp (-DMR)], and bulk density...

One significant factor in the operation of a fluidized bed combustor is the manner in which coal particles disperse and mix with the bed material upon entering the bed. A thermal tracing technique was used to study the mixing characteristics in a 1/4 scale model of a pressurized bubbling fluidized bed combustor. Particles cooled by liquid nitrogen are injected into the bed in the same way that ...

Metals like Fe, Ca, Mn present in sewage sludge ash have been deposited on high surface -alumina with high mechanical resistance used as bed materials during sewage sludge fluidized bed combustion to produce low-cost CLC oxygen carriers. The produced oxygen carriers have been characterized using ICP-MS, X-ray diffraction (XRD), Scanning Electron Microscopy (SEM) and surface area (BET) analysis....