MassTransferValue

MassTransferValue[pred,vars,pars]

represents a mass transfer boundary condition for PDEs with predicate pred indicating where it applies, with model variables vars and global parameters pars.

MassTransferValue[pred,vars,pars,lkey]

represents a mass transfer boundary condition with local parameters specified in pars[lkey].

Details

  • MassTransferValue specifies a boundary condition for MassTransportPDEComponent and is used as part of the modeling equation:
  • MassTransferValue is typically used to model the effect of a reactive flow outside the simulation domain.
  • MassFluxValue models mass species transferred across some part of the boundary with dependent variable in , independent variables in and time variable in .
  • Stationary variables vars are vars={c[x1,,xn],{x1,,xn}}.
  • Time-dependent variables vars are vars={c[t,x1,,xn],t,{x1,,xn}}.
  • The non-conservative time-dependent mass transport model MassTransportPDEComponent is based on a convection-diffusion model with mass diffusivity , mass convection velocity vector , mass reaction rate and mass source term :
  • The conservative time-dependent mass transport model MassTransportPDEComponent is based on a conservative convection-diffusion model given by:
  • The mass transfer value MassTransferValue with mass transfer coefficient in m/s and external mass concentration in and and boundary unit normal models:
  • Model parameters pars as specified for MassTransportPDEComponent.
  • The following additional model parameters pars can be given:
  • parameterdefaultsymbol
    "AmbientConcentration"
  • 0
  • , external mass concentration in
    "MassTransferCoefficient "1, mass transfer coefficient in
  • All model parameters may depend on any of , and , as well as other dependent variables.
  • To localize model parameters, a key lkey can be specified, and values from association pars[lkey] are used for model parameters.
  • MassTransferValue is a special case of a MassFluxValue.
  • MassTransferValue evaluates to a generalized NeumannValue.
  • The boundary predicate pred can be specified as in NeumannValue.
  • If the MassTransferValue depends on parameters that are specified in the association pars as ,keypi,pivi,], the parameters are replaced with .

Examples

open allclose all

Basic Examples  (2)

Set up a mass transfer boundary condition:

Set up a system of mass transfer boundary conditions:

Scope  (3)

Define model variables vars for a transient acoustic pressure field with model parameters pars and a specific boundary condition parameter:

Define model variables vars for a transient acoustic pressure field with model parameters pars and multiple specific parameter boundary conditions:

Model mass transport of a pollutant in a 2D rectangular region in an isotropic homogeneous medium. Initially, the pollutant concentration is zero throughout the region of interest. A concentration of 3000 is maintained at a strip with dimension 0.2 located at the center of the left boundary, while the right boundary is subject to a parallel species flow with constant concentration of 1500 , allowing for mass transfer. A pollutant outflow of 100 is applied at both the top and bottom boundaries. A diffusion coefficient of 0.833 is distributed uniformly with a uniform horizontal velocity of 0.01 :

 del .(-d del c(x,y))+v^->.del c(x,y)^(︷^(           mass transport model              )) =|_(Gamma_(y=0, y=10))q(x,y)^(︷^(    mass flux value     ))+|_(Gamma_(x=20))h (c_(ext)(x,y)-c(x,y))^(︷^(         mass transfer value       ))

Set up the mass transport model variables vars:

Set up a rectangular domain with a width of and a height of :

Specify model parameters species diffusivity and fluid flow velocity :

Set up a species concentration source of 0.2 in length at the center of the left surface:

Set up a mass transfer boundary on the right surface:

Set up an outflow flux of on the top and bottom surfaces:

Set up the equation:

Solve the PDE:

Visualize the solution:

Wolfram Research (2020), MassTransferValue, Wolfram Language function, https://reference.wolfram.com/language/ref/MassTransferValue.html.

Text

Wolfram Research (2020), MassTransferValue, Wolfram Language function, https://reference.wolfram.com/language/ref/MassTransferValue.html.

BibTeX

@misc{reference.wolfram_2020_masstransfervalue, author="Wolfram Research", title="{MassTransferValue}", year="2020", howpublished="\url{https://reference.wolfram.com/language/ref/MassTransferValue.html}", note=[Accessed: 18-April-2021 ]}

BibLaTeX

@online{reference.wolfram_2020_masstransfervalue, organization={Wolfram Research}, title={MassTransferValue}, year={2020}, url={https://reference.wolfram.com/language/ref/MassTransferValue.html}, note=[Accessed: 18-April-2021 ]}

CMS

Wolfram Language. 2020. "MassTransferValue." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/MassTransferValue.html.

APA

Wolfram Language. (2020). MassTransferValue. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/MassTransferValue.html