10.08.2013 Views

Code Manual for CONTAIN 2.0 - Federation of American Scientists

Code Manual for CONTAIN 2.0 - Federation of American Scientists

Code Manual for CONTAIN 2.0 - Federation of American Scientists

SHOW MORE
SHOW LESS

Create successful ePaper yourself

Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.

SURTEN the surface tension <strong>of</strong> a wet particle with the atmosphere that is responsible<br />

= surten <strong>for</strong> the Kelvin effect. The default value is zero, which is used as a flag to ~<br />

ignore the Kelvin effect. Default = O. (kg/s2)<br />

NSTEP the number <strong>of</strong> time intervals to be used in the growth calculation <strong>for</strong> each<br />

= nstep <strong>CONTAIN</strong> system timestep. Default= 1.<br />

MOLEWT the array <strong>of</strong> “nac”-1molecular weights <strong>for</strong> each aerosol component except the<br />

= (molewt) last component, which must be water. Default= 100.<br />

SOLUBL the array <strong>of</strong> “nac”-1 volubility factors <strong>for</strong> each aerosol component except the<br />

= (solubl) last component, which must be water. This number is equal to the number<br />

<strong>of</strong> ions <strong>for</strong>med by the dissolution <strong>of</strong> one molecule <strong>of</strong> aerosol component. For<br />

example, <strong>for</strong> NaOH, assuming complete dissolution the volubility factor<br />

would be 2. The material is assumed to be insoluble if zero is specified.<br />

Default = O.<br />

IFCOND<br />

= ifcond<br />

the condensation flag to add aerosol if none is present. If set to 1, a check<br />

will be made as to whether some aerosol is present. If no aerosol exists,<br />

aerosol will be added to attain a concentration <strong>of</strong> 10-7kg/m3 <strong>for</strong> each<br />

component other than water. The default value <strong>of</strong> 2 results in no aerosol<br />

addition. If set to 3, water will be added to the smallest bin to attain a<br />

concentration <strong>of</strong> 10-10kg/m3. Default =2.<br />

The last group <strong>of</strong> variables in this block specifies the aerosol components to be used in the problem<br />

and the initial values <strong>of</strong> the aerosol size distribution parameters “amean” and “avar.” This group<br />

terminates the global aerosol block and thus should follow any <strong>of</strong> the keywords described above.<br />

Note that the aerosol block is not terminated with an EOI. The following group <strong>of</strong> three variables<br />

is repeated “nac” times, once <strong>for</strong> each aerosol component.<br />

mapaer an aerosol component name. This name must be one <strong>of</strong> the materials<br />

specified in the COMPOUND or AERNAMES input blocks. (See Section<br />

14.2.1.)<br />

mean<br />

avar<br />

a volume-equivalent mass median particle diameter to be used <strong>for</strong> initial<br />

distributions and sources <strong>of</strong> new particles. This corresponds to the ~<br />

parameter in Equation (7-l). Default= 1.0x 10+. (m)<br />

a natural logarithm <strong>of</strong> geometric standard deviation <strong>of</strong> the particle size<br />

distribution to be used <strong>for</strong> initial distributions and sources <strong>of</strong> new particles.<br />

This corresponds to ln(o~)in Equation (7-l). Default = 0.693.<br />

Rev O 14-38 6/30/97

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!