Computational Fluid Dynamics Recreation of Inside Circulating Fluidized Bed Reactor for Dry Recreating of Methane

Benjapon Chalermsinsuwan^*
*Correspondence: Benjapon Chalermsinsuwan, Fuels Research Center, Department of Chemical Technology, Faculty of Science, Chulalongkorn University, 254 Phayathai Road, Wangmai, Pathumwan, Bangkok, Thailand, Email:

Perspective

Internally circulating fluidized bed reactor (ICFB) is the reactor that joins the conventional circulating fluidized bed (CFB) reactor framework, including riser, downer, loop seal and twisters, into a solitary minimal reactor section. The ICFB reactor segment is isolated into two segments (riser and downer) by baffles and is connected together through interfacing ports. The solid particles are circled in the ICFB reactor by inconsistent fluidizing speeds in the riser and downer segments. The solid particles in the downer segment are worked with low fluidizing speed in the percolating fluidization system. In the riser segment, the solid particles are moved to the downer segment due to the high fluidizing speed. In this review, the carbon dioxide changing or dry improving response of methane was explored. Dry changing is a response between carbon dioxide and methane, which are the major greenhouse gases and significant ozone depleting substances, for delivering syngas, hydrogen and carbon monoxide. The hydrodynamics and dry changing response with various reactor plans were investigated utilizing two-dimensional Eulerian– Eulerian computational fluid dynamics simulation (CFD). The ICFB reactor with no rise gas merchant, 90 cm of draft tube tallness, 2 cm of circle seal length and 1 cm of gas outlet breadth gave the most noteworthy methane change of 15.4%. The analysis of variance (ANOVA) demonstrated that the length of circle seal and the gas outlet breadth gave considerable negative and beneficial outcomes on methane conversion, respectively. The connection between length of loop seal and gas outlet width likewise significantly affected the methane conversion. Although the ICFB reactor in this review gave the methane transformation slightly lower than referred literature conventional CFB reactor, the ICFB reactor is the reactor that can decrease development cost and work on complex reactor activity.

Industrial aerobic fermentation processes are acted in huge scope bioreactors (> 20 m3). Understanding the nearby values of the velocity field, the vortex scattering rate and the gas volume division is of revenue, as these boundaries influence blending and mass exchange and thus maturation process execution and benefit. Regardless of the modern and scholarly significance of these stream variables in huge scope bioreactors, there is scarce literature tending to it. This article gives a mathematical correlation utilizing Computational Fluid Dynamics (CFD) of various economically applicable reactor types (bubble columns and stirred tanks with various impeller designs) worked inside a sensible scope of industrial conditions (40 – 90 m3, 0.3 – 6 kW m-3, 0.5 – 1 vvm). Nearby stream variables and mixing times are assessed for all cases studied. The assortment of these information permits the forecast of the ordinary benefits of mixing time (10 – 206 s) and oxygen transfer rate (1 – 8 kg m-3 h-1) in industrial bioreactors, and serves as reason for the correlation between various reactor types.

Culture medium is as often as possible demonstrated as water in computational fluid dynamics (CFD) investigation of in vitro culture systems involving flow, for example, bioreactors and organ-on-chips. In any case, culture medium can be anticipated to have various properties to water because of its higher solute content. Besides, cell exercises, for example, metabolism and secretion of ECM proteins change the arrangement of culture medium and subsequently its properties during culture. As these properties straight forwardly decide the hydro mechanical stimuli applied on cells in vitro, these, alongside any progressions during culture should be known for CFD demonstrating exactness and significant understanding of cell responses. In this review, the density and dynamic viscosity of DMEM and RPMI-1640 media enhanced with typical concentrations of foetal bovine serum (0, 5, 10 and 20% v/v) were estimated to fill in as a kind of perspective for computational design analysis. Any progressions in the properties of medium during culture were additionally investigated with NCI–H460 and HN6 cell lines. The density and dynamic viscosity of the media expanded relative to the % volume of added foetal bovine serum (FBS). Critically, the viscosity of 5% FBS-supplemented RPMI1640 was found to increase essentially following 3 days of culture of NCI– H460 and HN6 cell lines, with unmistakable differences between magnitudes of progress for every cell line. At last, these tentatively determined values were applied in CFD examination of a straightforward microfluidic device, which exhibited clear contrasts in maximum wall shear stress and pressure between fluid models. Generally, these outcomes feature the significance of describing model-specific properties for CFD design analysis of cell culture systems.