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Code Manual for CONTAIN 2.0 - Federation of American Scientists

Code Manual for CONTAIN 2.0 - Federation of American Scientists

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considered in the TOF/KU model. The default value <strong>for</strong> each cut<strong>of</strong>f is 10, but the user may override<br />

this value <strong>for</strong> the first and subsequent impacts. The default is based on droplet entrainment in ~<br />

vertical tubes from the work in ReferenceBrg81.<br />

The reader should also be aware that the equations presented below are applied to each debris field<br />

individually, even though this is not explicitly indicated by the simplified notation used below.<br />

There<strong>for</strong>e, the trapping rate <strong>of</strong> one field will typically be different than other fields with different<br />

sizes and debris densities.<br />

6.3.6.1 TOF/KU Case 1:Trapping On First Inmact. Gases flowing into a cell are assumed to entrain<br />

gases in the cell using the Ricou-Spalding [Ric61] entrainment correlation. With this correlation,<br />

the density <strong>of</strong> the gas jet impinging the first structure used in evaluating Nfi is given by<br />

where,<br />

POI?J<br />

p,,, = [pa+ (&l)Pol<br />

and Ll is the user-specified distance to the first structure as previously noted,<br />

cut<strong>of</strong>f distance below which no entrainment occurs. This distance is given by<br />

do<br />

xc=— a<br />

J 4A0<br />

dO= —<br />

7C<br />

a=czo<br />

J &j<br />

Po<br />

Pi<br />

Po = Pg,u<br />

~<br />

[<br />

(6-98)<br />

(6-99)<br />

and XCis a critical<br />

(6-100)<br />

where a is the density corrected jet expansion coefficient, ~ is the hydraulic diameter <strong>of</strong> flow path<br />

opening, & is the area <strong>of</strong> the flow path opening, a. is the user-definable jet expansion coefficient

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