Showing papers on "Mass transfer published in 2019"
TL;DR: In this paper, the effects of mass transfer on second grade fluid flow subjected to the heat transfer incorporated with the relaxation time to reach the state of equilibrium on or after a state of upheaval is analyzed.
171 citations
TL;DR: In this article, a multi-functional honeycomb ceramic plate was fabricated by coating a layer of CuFeMnO4 on the surface of a cordierite honeycomb substrate.
133 citations
TL;DR: In this article, a spiral microchannel was constructed to induce the centrifugal force to evaluate the geometrical effect of microchannel in the extraction efficiency, and the results showed that the spiral micro channel is more efficient when the flow rate of water and ionic liquid phases is highest and extraction efficiency of 52% is obtained in this condition, which is equivalent to equilibrium extraction efficiency.
105 citations
TL;DR: In this article, a 2D mathematical model was developed by considering molecular diffusion in radial and axial directions as well as non-wetting condition for CO2 absorption in hollow fiber membrane contactor.
99 citations
TL;DR: In this paper, four principal intra-particle phenomena occur in a highly concerted manner during pyrolysis of lignocellulosic materials: heat transfer, mass transfer, chemical reactions, and phase changes.
98 citations
TL;DR: In this paper, a series of N, P co-doped micro/mesoporous carbon materials with tunable/unalterable/negligible meso-/micro-/macro-pore volumes were synthesized to pioneer the relationship of the mesopore volume on behalf of the vertical coordinate of pore size distribution with the - mass transfer and ORR active site density of such metal-free heteroatomdoped porous carbon materials.
95 citations
91 citations
TL;DR: In this article, the Soret and Joule effects of MHD mixed convective flow of an incompressible and electrically conducting viscous fluid past an infinite vertical porous plate taking Hall effects into account are examined.
90 citations
TL;DR: In this article, the CO2 adsorption and desorption kinetics of a magnetite-based sorbent, obtained coating a low-cost carbon black (CB) with magnetite fine particles (FM), have been systematically and thoroughly investigated for the first time under post-combustion capture operating conditions.
88 citations
TL;DR: In this article, the authors review the whole-process photocatalytic water splitting from two kinds of "flow" (energy flow and mass flow): energy flow represents transmission and conversion of solar energy through the concentrator, reactor, reaction solution, and photocatalyst, while mass flow refers to transfer of reactants and products in the gas-liquid-solid multiphase environment.
87 citations
TL;DR: In this article, a mixed convection micropolar fluid flow in porous medium with uniform magnetic field towards nonlinear stretched surface was analyzed in the presence of viscous dissipation, Joule heating and convective boundary condition.
TL;DR: In this article, a numerical method for calculating the mass transfer coefficient in fibrous media is presented, where pressure driven flow is modelled using the Lattice Boltzmann Method.
TL;DR: In this article, a universal flow map based on composite terms of C a C R e C 0.5 and C a D 0.7 R e D 0.5 was proposed to represent the competition between interfacial tension and the inertia/viscous force, which can excellently predict experimental data and literature results with fluid viscosity ranging from 0.85 to 1200mPa·s.
TL;DR: The FPMT model could successfully predict the kinetics data of Sr2+ sorption onto microplastics and can be used to describe the external mass transfer (EMT) and the internal masstransfer (IMT) processes and to calculate the diffusion rate.
TL;DR: In this article, the morphology of 3-D flow field is reconstructed based on optical microscope image to discuss the single and two-phase flow characteristics, and the effects of air inlet velocity, droplet size and baffle contact angle are discussed.
TL;DR: In this article, the analytical approach of a second grade fluid flow along a stretching cylinder and the Soret and Dufour effects is also investigated on the problem of thermal radiation.
TL;DR: It is discovered that the ultrafast diameter-dependent evaporation from nanopores with hydrophilic outer surfaces mainly stems from evaporating water thin films outside of the nanopores, which indicates that theEvaporation coefficient varies in different nanoscale confinements, possibly due to surface-charge-induced concentration changes of hydronium ions.
Abstract: Evaporation from nanopores plays an important role in various natural and industrial processes that require efficient heat and mass transfer. The ultimate performance of nanopore-evaporation-based ...
TL;DR: In this paper, the potential of attaching baffles to the feed/permeate channel shell to improve the direct contact membrane distillation performance has been investigated under laminar and turbulent flow, respectively.
TL;DR: In this paper, a first-order, catalytic chemical reaction is imposed on the inner surfaces of the microchannel walls, and local thermal non-equilibrium approach is employed to analyse heat transfer within the porous section of a microchannel.
Abstract: This paper investigates the energetic and entropic characteristics of a microchannel with thick walls. A first-order, catalytic chemical reaction is imposed on the inner surfaces of the microchannel walls, and local thermal non-equilibrium approach is employed to analyse heat transfer within the porous section of the microchannel. Further, endo-/exothermic physicochemical processes are incorporated into the fluid phase and solid structure of the microchannel. Two models describing the fluid–porous interface conditions known as Models A and B are incorporated. It is shown that for both interface models, and with the considered parametric values, the optimum thickness of the porous insert to achieve the maximum Nu is around 0.6. However, when PEC is considered, this optimum thickness may vary between 0 and 0.5. It is further shown that depending on the specification of the microreactor, either Model A or B may result in the prediction of the minimum total entropy generation rate. It is also demonstrated that by altering the endothermicity of the microreactor it is possible to find an optimal value, which minimizes the total rate of entropy generation.
TL;DR: In this article, a constitutive relation between fluid power flux and pressure gradient was discussed, and a conservative equation of fluid mechanical energy was introduced to describe convectional phenomena that are essential to convective heat and mass transfer.
TL;DR: A mathematical model for an incompressible, viscous, natural convection, and stagnation point slip flow of MHD Prandtl fluid over an infinite plate is proposed and the Soret and Dufour effects on the flow field are investigated.
TL;DR: The governing equations of the problem are transformed to nonlinear differential equations through similarity variables, which are solved through a well known scheme called homotopy analysis method and the solution is expressed through graphs and illustrations which show the influences of all the parameters.
Abstract: Chemical reaction in mixed convection magnetohydrodynamic second grade nanoliquid thin film flow through a porous medium containing nanoparticles and gyrotactic microorganisms is considered with entropy generation. The stratification phenomena, heat and mass transfer simultaneously take place within system. Microorganisms are utilized to stabilize the suspended nanoparticles through bioconvection. For the chemical reaction of species, the mass transfer increases. The governing equations of the problem are transformed to nonlinear differential equations through similarity variables, which are solved through a well known scheme called homotopy analysis method. The solution is expressed through graphs and illustrations which show the influences of all the parameters. The residual error graphs elucidate the authentication of the present work.
TL;DR: The physical solubility and mass transfer performance of CO2 absorption into aqueous N,N-dimethylethanolamine (DMEA) solution were comprehensively studied in this article.
TL;DR: The phenomenological mathematical models associated to the predicted equilibrium isotherms were developed and it was found that adsorption of cesium or strontium ions onto the active sites of the biosorbent was the rate-limiting step.
Abstract: An algal sorbent derived from Sargassum horneri was prepared and used to adsorb cesium and strontium ions from aqueous solution. The phenomenological mathematical models associated to the predicted equilibrium isotherms were developed to determine the rate-limiting steps of the adsorption process. The maximum adsorption capacity of cesium ion and strontium ion was calculated to be 0.358 and 1.72 mmol g−1, respectively. The adsorption kinetics followed to the pseudo-second-order equation. It was found that adsorption of cesium or strontium ions onto the active sites of the biosorbent was the rate-limiting step. In addition, the external mass transfer and the internal mass transfer cannot be neglected for the adsorption of strontium ion based on the error analysis. The functional groups relevant to the adsorption were carboxyl and sulfate groups.
TL;DR: The unsteady magnetohydrodynamics flow of nanofluid with variable fluid properties over an inclined stretching sheet in the presence of thermal radiation and chemical reaction is studied taking into account the effect of thermal conductivity and diffusion coefficient.
Abstract: The unsteady magnetohydrodynamics (MHD) flow of nanofluid with variable fluid properties over an inclined stretching sheet in the presence of thermal radiation and chemical reaction is studied taking into account the effect of variable fluid properties in thermal conductivity and diffusion coefficient. The governing partial differential equations are transformed into ordinary differential equations by using similarity transformation. The numerical solutions of the problem are obtained by using the fourth order Runge-Kutta method in line with the shooting technique. It is found that the increase in both thermal conductivity and radiative heat flux decreases the heat transfer rate but increases the skin friction and mass transfer rates. It is further observed that the increase in porosity parameter and magnetic field reduces the skin friction, heat, and mass transfer rates.
TL;DR: In this paper, a hot-air dryer equipped with an auxiliary heat pump and air recirculation system was used to dry kiwifruit slices at three different temperatures (45, 55 and 65 °C) to determine mass transfer and activation energy using two different models.
TL;DR: In this paper, the authors investigated the use of thermally modified bentonite Verde-lodo for batch adsorption of caffeine from aqueous solution, and the results showed an increase on the bulk density, reduction on skeletal density and reduction in the volume of micropores and mesopores.
TL;DR: In this article, uncoated and nano iron-based coated biomass were employed as packing material in lab-scale and large-lab-scale columns for the removal of Cr(VI) from synthetic wastewaters.