Research on Mass Transfer Process of AMD Corrosion Reaction and Model of Deposition Calculation for Acid Load

Evaluate the influence instability by AMD corrosion based on the slope of a large-scale sulfide mine. On the basis of the corrosion experiment, carry out the researches on the solution ion change rules before vs. after evaluation; set up the mathematical expression of the AMD corrosion amount through the analysis of the corrosion mass transfer; establish the acid load deposition calculation model by AMD based on the oxidation mechanism analysis of sulfide ores; the engineering application indicates that, at the puddle, wells, sump and fracturing catchment areas, AMD acid load deposition was accumulated and the acid load is significantly higher than other area which is up to 500 mg/L; on the slope surface, as the time period affected by AMD is shorter, acid load is between 166~300mg/L; for the streams far away from mines, the acid load, less than 20mg/L, is at the minimum level. The model calculation result is consistent with the spot reality.

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Evaluating oxygen mass transfer parameters for large-scale engineering application of membrane bioreactors

Process Biochemistry ◽

10.1016/j.procbio.2017.05.020 ◽

2017 ◽

Vol 60 ◽

pp. 13-18 ◽

Cited By ~ 7

Author(s):

Ying Xu ◽

Ningwei Zhu ◽

Jianyu Sun ◽

Peng Liang ◽

Kang Xiao ◽

...

Keyword(s):

Mass Transfer ◽

Large Scale ◽

Engineering Application ◽

Membrane Bioreactors ◽

Oxygen Mass Transfer ◽

Transfer Parameters

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Concentration Distribution in the Wake of a Plane Surface Buried in a Porous Media in Alignment with the Flow Direction

Defect and Diffusion Forum ◽

10.4028/www.scientific.net/ddf.283-286.553 ◽

2009 ◽

Vol 283-286 ◽

pp. 553-558

Author(s):

João M.P.Q. Delgado ◽

M. Vázquez da Silva

Keyword(s):

Mass Transfer ◽

Peclet Number ◽

Numerical Solutions ◽

Plane Surface ◽

Flow Direction ◽

Mathematical Expression ◽

Mass Conservation ◽

Mass Transfer Process ◽

Packed Bed ◽

Péclet Number

The present work describes the mass transfer process between a moving fluid and a slightly soluble flat surface buried in a packed bed of small inert particles with uniform voidage, by both advection and diffusion. Numerical solutions of the differential equation describing solute mass conservation were undertaken to obtain the concentration profiles, for each concentration level, the width and downstream length of the corresponding contour surface and the mass transfer flux was integrated to give the Sherwood number as a function of Peclet number. A mathematical expression that relates the dependence with the Peclet number is proposed to describe the approximate size of the diffusion wake downstream of the reactive solid mass.

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A calculating model for acid load settlement based on mass transfer process of AMD corrosion

Progress in Civil, Architectural and Hydraulic Engineering IV ◽

10.1201/b19383-66 ◽

2015 ◽

pp. 325-330

Author(s):

L Jiang ◽

W Li ◽

J Zeng

Keyword(s):

Mass Transfer ◽

Transfer Process ◽

Mass Transfer Process ◽

Acid Load ◽

Calculating Model

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Vertical Load Mechanism Analysis and Experimental Research on Super-Long PHC Pipe Pile in Soft Clay

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.204-208.471 ◽

2012 ◽

Vol 204-208 ◽

pp. 471-478 ◽

Cited By ~ 1

Author(s):

Li Jun Zhou ◽

Ziai Lu ◽

Wen Juan Wang

Keyword(s):

Experimental Research ◽

Pile Foundation ◽

Large Scale ◽

Soft Clay ◽

Calculation Model ◽

Mechanism Analysis ◽

Vertical Load ◽

Foundation Design ◽

First Choice ◽

Tip Resistance

Pile foundation design has gradually used the super-long pile structure form with the port and offshore engineering construction developing towards to the direction of large-scale, deepwater, and coast geological becomes more complex, bearing stratum becomes more deeper. PHC pile is the first choice of pile foundation design form, just because it has many advantages. The former researches of pile vertical load mainly on limit bearing capacity, the calculation is reasonable for short pile and middle long pile, however, it is not reasonable for super-long pile, pile body side and tip resistance can not reach the limit when structure is to limit. This paper puts forward the calculation model of super-long PHC pile vertical load in soft clay based on vertical load mechanism analysis and experimental research on the foundation pile, and the calculated and test value coincide preferably.

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Simulation of volumetric heating of a moist medium with allowance for fluid mobility

Proceedings of the Mavlyutov Institute of Mechanics ◽

10.21662/uim2012.1.017 ◽

2012 ◽

Vol 9 (1) ◽

pp. 91-93

Author(s):

U.R. Ilyasov ◽

A.V. Dolgushev

Keyword(s):

Mass Transfer ◽

Porous Medium ◽

Numerical Solution ◽

Heat And Mass Transfer ◽

Transfer Process ◽

Thermal Action ◽

Mass Transfer Process ◽

Low Permeability ◽

Volumetric Heating ◽

Drying Regime

The problem of volumetric thermal action on a moist porous medium is considered. Numerical solution, the influence of fluid mobility on the dynamics of the heat and mass transfer process is analyzed. It is established that fluid mobility leads to a softer drying regime. It is shown that in low-permeability media, the fluid can be assumed to be stationary.

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Free Convective Mass Transfer at Isosceles Triangular Surfaces of Varying Inclination

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc20032080 ◽

2003 ◽

Vol 68 (11) ◽

pp. 2080-2092 ◽

Cited By ~ 1

Author(s):

Martin Keppert ◽

Josef Krýsa ◽

Anthony A. Wragg

Keyword(s):

Mass Transfer ◽

Transfer Rate ◽

Mass Transfer Rate ◽

Mass Transfer Process ◽

Sulfate Solution ◽

Convective Mass Transfer ◽

Varying Length ◽

Inclined Surface ◽

Vertical Case ◽

Limiting Diffusion Current

The limiting diffusion current technique was used for investigation of free convective mass transfer at down-pointing up-facing isosceles triangular surfaces of varying length and inclination. As the mass transfer process, copper deposition from acidified copper(II) sulfate solution was used. It was found that the mass transfer rate increases with inclination from the vertical to the horizontal position and decreases with length of inclined surface. Correlation equations for 7 angles from 0 to 90° were found. The exponent in the ShL-RaL correlation ranged from 0.247 for the vertical case, indicating laminar flow, to 0.32 for inclinations of 60 to 90°, indicating mixed or turbulent flow. The general correlation ShL = 0.358(RaL sin θ)0.30 for the RaL sin θ range from 7 × 106 to 2 × 1011 and inclination range from 15 to 90° was obtained.

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Extreme Floods in the Eastern Part of Europe: Large-Scale Drivers and Associated Impacts

Water ◽

10.3390/w13081122 ◽

2021 ◽

Vol 13 (8) ◽

pp. 1122

Author(s):

Monica Ionita ◽

Viorica Nagavciuc

Keyword(s):

Water Vapor ◽

Heavy Rainfall ◽

Large Scale ◽

Vapor Transport ◽

Water Vapor Transport ◽

Flood Events ◽

Rainfall Events ◽

Catchment Areas ◽

Large Scale Atmospheric Circulation ◽

Heavy Rainfall Events

The role of the large-scale atmospheric circulation in producing heavy rainfall events and floods in the eastern part of Europe, with a special focus on the Siret and Prut catchment areas (Romania), is analyzed in this study. Moreover, a detailed analysis of the socio-economic impacts of the most extreme flood events (e.g., July 2008, June–July 2010, and June 2020) is given. Analysis of the largest flood events indicates that the flood peaks have been preceded up to 6 days in advance by intrusions of high Potential Vorticity (PV) anomalies toward the southeastern part of Europe, persistent cut-off lows over the analyzed region, and increased water vapor transport over the catchment areas of Siret and Prut Rivers. The vertically integrated water vapor transport prior to the flood peak exceeds 300 kg m−1 s−1, leading to heavy rainfall events. We also show that the implementation of the Flood Management Plan in Romania had positive results during the 2020 flood event compared with the other flood events, when the authorities took several precaution measurements that mitigated in a better way the socio-economic impact and risks of the flood event. The results presented in this study offer new insights regarding the importance of large-scale atmospheric circulation and water vapor transport as drivers of extreme flooding in the eastern part of Europe and could lead to a better flood forecast and flood risk management.

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A Semi-Theoretical Model for Water Condensation: Dew Used in Conservation of Earthen Heritage Sites

Water ◽

10.3390/w13010052 ◽

2020 ◽

Vol 13 (1) ◽

pp. 52

Author(s):

Xiang He ◽

Sijia Wang ◽

Bingjian Zhang

Keyword(s):

Mass Transfer ◽

Theoretical Model ◽

Field Experiments ◽

Environmental Control ◽

Mass Transfer Process ◽

Formation Processes ◽

Heritage Sites ◽

Dew Formation ◽

The Difference ◽

Two Parameter

Dew is a common but important phenomenon. Though water is previously considered to be a threat to earthen heritage sites, artificial dew is showing potential in relic preservation. A model of dew prediction on earthen sites will be essential for developing preventive protection methods, but studies of dew formation processes on relics are limited. In this study, a two parameter model is proposed. It makes approximations according to the features of earthen heritage sites, assuming that a thin and steady air layer exists close to the air–solid interface. This semi-theoretical model was based on calculations of the mass transfer process in the air layer, and was validated by simulations of laboratory experiments (R > 0.9) as well as field experiments. Additionally, a numerical simulation, performed by the commercial software COMSOL, confirmed that the difference between fitting parameter δ and the thickness of assumed mass transfer field was not significant. This model will be helpful in developing automatic environmental control systems for stabilizing water and soluble salts, thus enhancing preventive protection of earthen heritage sites.

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