Mass Transfer between Two Liquid Phases in a Spray Column at the Unsteady State

1978 ◽  
Vol 17 (2) ◽  
pp. 175-182 ◽  
Author(s):  
L. Steiner ◽  
M. Horvath ◽  
S. Hartland
Keyword(s):  
Mass Transfer ◽  
Unsteady State ◽  
Spray Column ◽  
Liquid Phases

Unsteady-state shear strategies to enhance mass-transfer for the implementation of ultrapermeable membranes in reverse osmosis: A review

Desalination ◽  
2015 ◽  
Vol 356 ◽  
pp. 328-348 ◽  
Author(s):  
Farhad Zamani ◽  
Jia Wei Chew ◽  
Ebrahim Akhondi ◽  
William B. Krantz ◽  
Anthony G. Fane
Keyword(s):  
Mass Transfer ◽  
Reverse Osmosis ◽  
Unsteady State ◽  
Enhance Mass

scholarly journals MATHEMATICAL MODELING OF THERMOGRAVITATIONAL AND THERMOCA-PILLARY CONVECTION IN GAS-LIQUID PROCESSES

2021 ◽  
Vol 2021 (1) ◽  
pp. 58-66
Author(s):  
Evgeniy Podoplelov ◽  
Aleksey Bal'chugov ◽  
Anatoliy Dement'ev ◽  
Anatoliy Glotov
Keyword(s):  
Mathematical Modeling ◽  
Mass Transfer ◽  
Phase Boundary ◽  
Mass Exchange ◽  
Exchange Process ◽  
Transfer Coefficients ◽  
Mass Exchange Process ◽  
Convective Flows ◽  
Liquid Phases ◽  
Turbulent Pulsations

. The interaction of gas and liquid phases in some cases is accompanied by the spontaneous occur-rence of convective flows and turbulent pulsations at the phase boundary and in adjacent areas. Hy-drodynamic instability allows to accelerate the interfacial transfer of matter and leads to an increase in mass transfer coefficients. Research in this field is not only theoretical, but also practical, since sur-face convection can be artificially created in apparatus for intensifying the mass exchange process.

Predicting Compositional Two-Phase Flow Behavior in Pipelines

1986 ◽  
Vol 108 (3) ◽  
pp. 207-210 ◽  
Author(s):  
H. Furukawa ◽  
O. Shoham ◽  
J. P. Brill
Keyword(s):  
Mass Transfer ◽  
Computational Algorithm ◽  
Two Phase Flow ◽  
Flow Behavior ◽  
Phase Flow ◽  
Temperature Profiles ◽  
Balance Equations ◽  
Two Phase ◽  
Liquid Phases ◽  
Retrograde Condensation

A computational algorithm for predicting pressure and temperature profiles for compositional two-phase flow in pipelines has been developed. The algorithm is based on the coupling of the momentum and energy balance equations and the phase behavior of the flowing fluids. Mass transfer between the gas and the liquid phases is treated rigorously through flash calculations, making the algorithm capable of handling retrograde condensation. Temperatures can be predicted by applying the enthalpy balance equation iteratively. However, it was found that the explicit Coutler and Bardon analytical solution for the temperature profile yields nearly identical results for horizontal and near horizontal flow.

G224 Correlation for the mass transfer in the spray column

2011 ◽  
Vol 2011 (0) ◽  
pp. 359-360
Author(s):  
Tsubasa Tanda ◽  
Yukihiko Matsumura ◽  
Hiroyuki Kitahara
Keyword(s):  
Mass Transfer ◽  
Spray Column

A Study of Permeability and Diffusion at the Agglomerate-Scale in Heap (Bio)Leaching Systems

2015 ◽  
Vol 1130 ◽  
pp. 316-320 ◽  
Author(s):  
Elaine Govender ◽  
Athanasios Kotsiopoulos ◽  
Sue T.L. Harrison
Keyword(s):  
Time Distribution ◽  
Initial Period ◽  
Unsteady State ◽  
Microbial Transport ◽  
Preliminary Results ◽  
Solution Exchange ◽  
Concentration Time ◽  
Liquid Phases ◽  
Bed Agglomeration ◽  
And Diffusion

Multiple mini-column reactors, loaded with identically constructed ore samples representing grab samples of a larger heap, were used to study the behaviour of solution tracers to elucidate solution diffusion, dispersion and transport. The tracers were either introduced to the ore bed as a pulse, included during agglomeration of the ore or introduced to the system by submerging the ore bed. These methods of tracer introduction allowed for the characterisation of flow interchange in unsteady state systems. The resulting concentration-time distribution curves were analysed to allow characterisation of flow dispersion and diffusion, which facilitates exchange between the fast flowing and largely stagnant liquid phases. Preliminary results support the presence of distinct stagnant and flowing regions within the agglomerated ore bed. Agglomeration with the tracer promotes increased retention on the ore; potentially enhancing microbial transport via increased solution exchange after the initial period of attachment.

A Linear Driving Force (LDF) Approximation of Moisture Diffusion Kinetics in White Rice

2008 ◽  
Vol 4 (8) ◽  
Author(s):  
Abhishek Dutta ◽  
Anirban Chanda ◽  
Runu Chakraborty
Keyword(s):  
Mass Transfer ◽  
Finite Difference ◽  
Driving Force ◽  
Rice Grain ◽  
Unsteady State ◽  
Moisture Uptake ◽  
Linear Diffusion ◽  
White Rice ◽  
Linear Driving Force ◽  
Kinetics Of

Soaking characteristics of white rice grain in water are studied at 25, 40, 60, 70 and 80 °C. The kinetics of mass transfer are modeled using a linear driving force (LDF) approximation with constant diffusivity, which is capable of predicting the moisture ratio profile with time. This approximation is a relatively new approach in food engineering applications for systems in which the rate of mass transfer is controlled by intra-particle diffusion and nonlinear adsorption through porous adsorbent. The mass transfer is also modeled through Fick's law for unsteady-state diffusion using finite difference (FD) method, and compared with the LDF model. In general, the moisture uptake curves calculated with this new approximation compare favorably with the finite difference solution obtained in spherical coordinates, producing results of similar accuracy. Both the methods give a good agreement with the experimental data. The values of the effective diffusion coefficients are between 7.33×10-11 m2/s and 1.43×10-10 m2/s for a temperature of 25 and 80 °C respectively. Although gelatinization of starch is observed at a higher temperature which influences the increase in moisture content, the moisture uptake curves calculated with this new approximation compare favorably with the numerical solution of the non-linear diffusion equation. As such, it can be safely used to predict the unsteady-state moisture absorption kinetics of a rice grain, for the temperature range investigated.

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