The fluidization of the catalyst makes also possible to (i) overcome problems with temperature control (formation of hotspots or too low temperature), (ii) to operate with smaller particles while still maintaining very low pressure drops and (iii) to overcome any concentration polarization
issue associated with more conventional fixed bed membrane reactors.
19) developed a mathematical model according to heat and mass transfer correlations that was able to describe the behavior of PV processes with strong control of concentration polarization under common non-isothermal and non-stationary conditions using plates-and frames membrane modules.
23) developed a CFD modeling and simulation framework to study the presence and effect of concentration polarization in mass transfer process of removing dilute volatile organic compound from water by PV.
Membrane separation is now widely applied for such purposes as biotechnology, clarifying fruit juices, and waste water treatment, but is limited by the presence of concentration polarization
and membrane fouling.
The new approach, called ion concentration polarization
, is described in a research paper by Postdoctoral Associate Sung Jae Kim and Associate Professor Jongyoon Han, both in MIT's Department of Electrical Engineering and Computer Science, and colleagues in Korea.
The three types of polarization encountered in electroplating are gas polarization, concentration polarization
and chemical polarization.
The electrodes must be face polarized to give a force across the face of the electrode in order to sweep away concentration polarization
with a rising or descending rapidly rotating helix.
This is difficult to explain using a concentration polarization
or resistance-in-series model.
The negative impact osmotic power has on the environment is analyzed in section D of the report, followed by a comprehensive analysis of the stages of salt permeability, concentration polarization
, reverse osmosis, hybrid OP-RO process, and an energy analysis of the osmotic power process.
The first four chapters cover the basics of membrane science, including transport theory, membrane and module preparation, and concentration polarization
Temperature polarization, concentration polarization
and membrane fouling in MD
He has worked on the dynamics of colloid transport and filtration in porous media, physicochemical treatment and remediation processes, membrane technology for wastewater reclamation and seawater desalination, microbial transport in the subsurface, colloid-facilitated transport of contaminants in groundwater, transport and fate of pathogens (viruses, bacteria, and protozoa) in the subsurface environment, fouling and concentration polarization
phenomena in pressure-driven membrane processes, and contaminant removal by membrane processes.