Analysis and development of method for calculating mass transfer by convective-diffusion of impurities in underground mine working

1988 ◽  
Vol 24 (4) ◽  
pp. 385-388
Author(s):  
K. Yu. Laigna
Keyword(s):  
Mass Transfer ◽  
Mine Working ◽  
Convective Diffusion ◽  
Underground Mine ◽  
Underground Mine Working ◽  
Diffusion Of Impurities

APPLICATION OF OTT'S MINE COORDINATE SYSTEM IN THE PAST AND IN PRESENT DAY

2013 ◽  
Vol 39 (2) ◽  
pp. 53-58 ◽  
Author(s):  
Hana Staňková ◽  
Pavel Černota
Keyword(s):  
Coordinate System ◽  
Coal Mining ◽  
Mine Working ◽  
Underground Mine ◽  
The State ◽  
The Past ◽  
Underground Mine Working

The coal district system of coordinates for mines located in the Ostrava region was established in 1858 by Dipl. Ing. František Ott, Surveyor of the Emperor Ferdinand Northern Railway (Severní dráha Ferdinandova). Coordinates of all significant points of existing mine shafts, characteristic mine surface points, and points in terrain, were determined by establishing mine triangulation within the Western part of the Ostrava-Karviná Coal District (OKR) on an area comprising almost 58 km2. Said points were stabilized by granite stones. The reason to establish this system of coordinates was to determine the points of a uniform basis of coordinates for making surveys both on the mine surface, i.e. for connecting the underground mine working, and simultaneously for removing any discrepancies occurring with respect to mine boundaries among particular proprietors, i.e. to allow for exact demarcation of mine areas bestowed to them by the state. Thus, nowadays Ott's system of coordinates that used to be applied during the period, in which within the OKR redevelopment works took place, like abatement the coal mining consequences.

scholarly journals Optimization of Parameters to Improve Ventilationin Underground Mine Working using CFD

2019 ◽  
Vol 8 (4) ◽  
pp. 12436-12441
Keyword(s):  
Mine Working ◽  
Underground Mine ◽  
Optimization Of Parameters ◽  
Underground Mine Working

Intundergroundtmine,tittistverytimportantttotmainta intfreshtandtsufficienttairtintunventilatedareasttotmaintainsafew orkingenvironmenttfortworkers.tTotstudytthetbehaviourtoftairflo wintundergroundtmine,tatT shaped crosscuttregiontoftBordandt Pillarmining ist considered forsimulation tint twot differentcases:twithouttandtwithtthintbratticetpositioningtattcross cutregion.tBratticetistcostteffectiveventilationcontroltdevicettodefl ectairtintotunventilatedareasintundergroundmine.Theultimatetob jectiveisttotfindtthetbestlocationtanddimensionofbratticetacrosstt hetcrosscuttregiontbytwhichtonetcantgetmaximumtvelocitytattdea dtend.tInthistthesis,tatcomputationalfluiddynamicst(CFD)tandtop timizationtalgorithmstareconsideredfortmaximizingtthetairtflowta ttthetdeadtendtbyplacingtatbratticetattoptimumlocation.tTwodiffe rentoptimizationtalgorithms:tmultiobjectivetgenetictalgorithm(MOGA)andtnonlinearprogrammingtofquadraticLagrangian(NLPQL)toptimizatio nttechniquestweretusedtintthisstudy.ANSYStFLUENTtsoftwareti stusedtforCFDtmodelingtat Tshapedtcrosscuttregiontandcomputestthetsimulationtresulttofairtf lowtvelocitytattdeadtend.tOptimizationttechniquesareusedforttoop timizetfourtinputtparameters;tbratticetpositiontverticalandhorizo ntaltfromtthewalltoftcrosscuttregiontandtwidthtandlengthtoftbratt ice.Thetobjectivestfortoptimizationstaretomaximizetthetvelocitytat tdeadtendtandtminimizetthetpressuredroptintcrosscuttregion.Com parisonistcarriedtouttbetweencrosscuttregiontwithouttandtwithtat thinbratticetusingoptimizationttechniquestandtfoundtthetbesttlocationtanddimensionoftbra ttice.tTotincreasethetairtflowtvelocitytattdeadtendincrease tthetsafetworkingtfortworkerstandtsupplyadequateairtatworkingtf ace

On the convective diffusion under partial slip at wall

1989 ◽  
Vol 54 (4) ◽  
pp. 967-980 ◽  
Author(s):  
Ondřej Wein ◽  
Petr Kučera
Keyword(s):  
Mass Transfer ◽  
Numerical Solution ◽  
Analytic Solution ◽  
Convective Diffusion ◽  
Linear Velocity ◽  
Partial Slip ◽  
Accurate Calculation ◽  
Transfer Coefficients ◽  
Empirical Formulas ◽  
Mass Transfer Coefficients

Extended Leveque problem is studied for linear velocity profiles, vx(z) = u + qz. The existing analytic solution is reconsidered and shown to be inapplicable for the accurate calculation of mean mass-transfer coefficients. A numerical solution is reported and its accuracy is checked in detail. Simple but fairly accurate empirical formulas are suggested for the calculating of local and mean mass-transfer coefficients.

Correction to ‘Unsteady convective diffusion with interphase mass transfer’

1974 ◽  
Vol 341 (1626) ◽  
pp. 407-408 ◽  
Keyword(s):  
Mass Transfer ◽  
Convective Diffusion ◽  
Interphase Mass Transfer

In the above-specified paper (Sankarasubramanian & Gill 1973), equations (48 a ) and (75) should read I ( j, l ) = I ( l, j )= ∫ 1 0 y 3 J 0 ( μ j y ) J 0 ( μ l y d y = 2(2 β 2 + μ 2 j + μ 2 l / ( μ 2 j – μ 2 l ) 2 J 0 ( μ j ) J 0 ( μ l ) ( j ≠ l ), K 2 ≈ 1/( Pe ) 2 + 64(1+6/ β ) λ 2 1 Ʃ ∞ l =1 λ 2 l +1 / ( λ 2 l +1 – λ 2 1 ) 5∙

scholarly journals Interpolation of Boundary Condition at Time-Interval of Unknown Lenghth for the Problem of Convective Diffusion in a Three-Layered Water Filter

2019 ◽  
pp. 25-28
Author(s):  
Olha Chernukha ◽  
Yurii Bilushchak
Keyword(s):  
Experimental Data ◽  
Mathematical Model ◽  
Mass Transfer ◽  
Boundary Condition ◽  
Boundary Value Problem ◽  
Convective Diffusion ◽  
Lower Boundary ◽  
Time Interval ◽  
Water Filter ◽  
The Right

On the basis of mathematical model of convectivediffusion in a three-layered filter it is formulated a contactinitial-boundary value problem for description of mass transferof pollution accompanying the sorption processes. It is proposedthe algorithm for establishing the estimation of values of soughtfunction (concentration of pollution) at the lower boundary of thefilter on the basis of the interpolation of experimental data. It istaken into account that the right end of the interpolation segmentis unknown. It is determined the exact solutions of contact-initialboundaryvalue problems of mass transfer with provision forboth diffusive and convective mechanisms of transfer as well assorption processes, which is based on integral transformationsover space variables in the contacting regions. Is it designedsoftware and established regularities of convective diffusionprocess in the three-layered filter.

scholarly journals Classification of Theories about Rock Pressure

2018 ◽  
Vol 277 ◽  
pp. 157-167 ◽  
Author(s):  
Oleh Khomenko ◽  
Maksym Kononenko ◽  
Janchiv Bilegsaikhan
Keyword(s):  
Physical Properties ◽  
Rock Pressure ◽  
Mine Working ◽  
Physical Processes ◽  
Classification Feature ◽  
The World ◽  
Underground Mine Working ◽  
Mine Workings ◽  
Energy Theory

The first classificationsw of physical properties of rocks and hypotheses of rock pressure in the world practice are analysed. The analysis of internationally widely known theories about rock pressure and physical processes around mine workings is executed. Classification of theories about rock pressure on classification feature “condition of investigated massif” is constructed. The energy theory that describing capsulation by the massif of underground mine working is offered.

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