The mass transport rate of mercuric iodide during its crystallization from the vapor phase

1983 ◽  
Vol 62 (2) ◽  
pp. 384-388 ◽  
Author(s):  
M. Piechotka ◽  
J. PrzyŁuski
Keyword(s):  
Mass Transport ◽  
Vapor Phase ◽  
Transport Rate ◽  
Mercuric Iodide ◽  
Mass Transport Rate

New methodology for the determination of mass transport rate from rotating disks and/or cylinders in liquid

1994 ◽  
Vol 65 (2) ◽  
pp. 58-64
Author(s):  
Yoshimoto Wanibe ◽  
Esther Boschatzke ◽  
Franz Oeters ◽  
Takashi Itoh
Keyword(s):  
Mass Transport ◽  
Transport Rate ◽  
Rotating Disks ◽  
Mass Transport Rate

Enhancement of mass transport and separation of species by oscillatory electroosmotic flows

2006 ◽  
Vol 462 (2071) ◽  
pp. 2017-2038 ◽  
Author(s):  
Hsin-Fu Huang ◽  
Chun-Liang Lai
Keyword(s):  
Mass Transport ◽  
Oscillation Frequency ◽  
Total Mass ◽  
Debye Length ◽  
Transport Rate ◽  
Two Dimensional ◽  
Womersley Number ◽  
Dispersion Effects ◽  
Mass Transport Rate ◽  
Electroosmotic Flows

Mass transport driven by oscillatory electroosmotic flows (EOF) in a two-dimensional micro-channel is studied theoretically. The results indicate that the velocity and concentration distributions across the channel-width become more and more non-uniform as the Womersley number W , or the oscillation frequency, increases. It is also revealed that, with a constant tidal displacement, the total mass transport rate increases with the Womersley number W due to both the stronger convective and the transverse dispersion effects. The total mass transport rate also increases with the tidal displacement (with a fixed oscillation frequency) because of the associated stronger convective effects. The cross-over phenomenon of the mass transport rates for different species becomes possible with sufficiently large Debye lengths and at sufficiently large values of W . Consequently, with proper choices of the Debye length, oscillation frequency and tidal displacement, oscillatory EOF may become a good candidate for the first-step separation of the mass species.

scholarly journals Plume dynamics in Hele-Shaw porous media convection

2016 ◽  
Vol 374 (2078) ◽  
pp. 20150420 ◽  
Author(s):  
Robert E. Ecke ◽  
Scott Backhaus
Keyword(s):  
Porous Media ◽  
Mass Transport ◽  
Molecular Diffusion ◽  
Spatial Separation ◽  
Transport Rate ◽  
Plume Dynamics ◽  
Variable Permeability ◽  
Mass Transport Rate ◽  
Laboratory Analogue ◽  
Hele Shaw Cell

Mass transport in multi-species porous media is through molecular diffusion and plume dynamics. Predicting the rate of mass transport has application in determining the efficiency of the storage and sequestration of carbon dioxide. We study a water and propylene–glycol system enclosed in a Hele-Shaw cell with variable permeability that represents a laboratory analogue of the general properties of porous media convection. The interface between the fluids, tracked using an optical shadowgraph technique, is used to determine the mass transport rate, the spatial separation of solutal plumes, and the velocity and width characteristics of those plumes. One finds that the plume dynamics are closely related to the mass transport rate. This article is part of the themed issue ‘Energy and the subsurface’.

scholarly journals Mass Transport of Gases across the Air–Water Interface: Implications for Aldehyde Emissions in the Uinta Basin, Utah, USA

Atmosphere ◽  
2020 ◽  
Vol 11 (10) ◽  
pp. 1057
Author(s):  
Marc L. Mansfield
Keyword(s):  
Mass Transport ◽  
Vapor Phase ◽  
Current Model ◽  
Molecular Forms ◽  
Water Interface ◽  
Uinta Basin ◽  
Transport Models ◽  
Air Water Interface ◽  
The Difference ◽  
Pass Through

When they dissolve in water, aldehydes become hydrated to gem-diols: R−COH+H2O↔RCH(OH)2. Such reactions can complicate air–water transport models. Because of a persistent belief that the gem-diols do not exist in the vapor phase, typical models do not allow them to pass through the air–water interface, but in fact, they do. Therefore, transport models that allow both molecular forms to exist in both phases and to pass through the interface are needed. Such a model is presented here as a generalization of Whitman’s two-film model. Since Whitman’s model has fallen into disuse, justification of its use is also given. There are hypothetical instances for which the flux predicted by the current model is significantly larger than the flux predicted when models forbid the diol form from passing through the interface. However, for formaldehyde and acetaldehyde, the difference is about 6% and 2%, respectively.

Mass-transport driven growth dynamics of AlGaAs shells deposited around dense GaAs nanowires by metalorganic vapor phase epitaxy

CrystEngComm ◽  
2015 ◽  
Vol 17 (31) ◽  
pp. 5998-6005 ◽  
Author(s):  
Ilio Miccoli ◽  
Paola Prete ◽  
Nico Lovergine
Keyword(s):  
Mass Transport ◽  
Vapor Phase ◽  
Growth Dynamics ◽  
Metalorganic Vapor Phase Epitaxy ◽  
Shell Material ◽  
Free Standing ◽  
Group Iii ◽  
Gaas Nanowires ◽  
Movpe Growth ◽  
Vapor Mass

The MOVPE growth dynamics of AlGaAs shell material around ensembles of free-standing GaAs nanowires is presented and described by a model based on the vapor mass-transport of group-III species and the nanowires relevant size (diameter, height) and density.

scholarly journals Quantifying Joule Heating and Mass Transport in Metal Nanowires During Controlled Electromigration

Materials ◽  
2019 ◽  
Vol 12 (2) ◽  
pp. 310
Author(s):  
Mamiko Yagi ◽  
Jun-ichi Shirakashi
Keyword(s):  
Mass Transport ◽  
Joule Heating ◽  
Heat Dissipation ◽  
Heating Power ◽  
Local Temperature ◽  
Metal Nanowires ◽  
Average Mass ◽  
Force Microscopy ◽  
Mass Transport Rate ◽  
Au Nanowires

The nanoscale heat dissipation (Joule heating) and mass transport during electromigration (EM) have attracted considerable attention in recent years. Here, the EM-driven movement of voids in gold (Au) nanowires of different shapes (width range: 50–300 nm) was directly observed by performing atomic force microscopy. Using the data, we determined the average mass transport rate to be 105 to 106 atoms/s. We investigated the heat dissipation in L-shaped, straight-shaped, and bowtie-shaped nanowires. The maximum Joule heating power of the straight-shaped nanowires was three times that of the bowtie-shaped nanowires, indicating that EM in the latter can be triggered by lower power. Based on the power dissipated by the nanowires, the local temperature during EM was estimated. Both the local temperature and junction voltage of the bowtie-shaped nanowires increased with the decrease in the Joule heating power and current, while the current density remained in the order of 108 A/cm2. The straight-shaped nanowires exhibited the same tendency. The local temperature at each feedback point could be simply estimated using the diffusive heat transport relationship. These results suggest that the EM-driven mass transport can be controlled at temperatures much lower than the melting point of Au.

scholarly journals Numerical Investigation of Heat and Mass Transport in the Flow over a Magnetized Wedge by Incorporating the Effects of Cross-Diffusion Gradients: Applications in Multiple Engineering Systems

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Aisha M. Alqahtani ◽  
Adnan ◽  
Umar Khan ◽  
Naveed Ahmed ◽  
Syed Tauseef Mohyud-Din ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Mass Transport ◽  
Constitutive Relations ◽  
Shear Stresses ◽  
Magnetic Field Effects ◽  
Concentration Gradients ◽  
Heat And Mass Transport ◽  
Cross Diffusion ◽  
Mass Transport Rate ◽  
Soret Number

The flow over a wedge is significant and frequently occurs in civil engineering. It is significant to investigate the heat and mass transport characteristics in the wedge flow. Therefore, the analysis is presented to examine the effects of preeminent parameters by incorporating the cross-diffusion gradients in the energy and mass constitutive relations. From the analysis, it is perceived that the temperature drops against a higher Prandtl number. Due to concentration gradients in the energy equation, the temperature rises slowly. Moreover, it is examined that the mass transfer significantly reduces due to Schmidt effects and more mass transfer is pointed against the Soret number. The shear stresses increase due to stronger magnetic field effects. The local thermal performance of the fluid enhances against more dissipative fluid, and DuFour effects reduced it. Furthermore, the mass transport rate drops due to higher Soret effects and increases against multiple Schmidt number values.

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