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To obtain the stationary values for pgfn, pgfw and pgfc for radicals and polymers at each cell and obviously at the reactor exit, Eqs 27, 28, 32, 33, 35, and 36 must be solved at each of the selected values of the transformed variable z, 0 [less than or equal to] z [less than or equal to] 1.
The output of the pgf model consists of pgfn, pgfw and pgfc at each reactor cell and of course at the reactor exit.
As a first step we calculated the pgfn, pgfw, and pgfc from the measured MWD, in order to compare them with the ones calculated by pgf balances.
2 the curves for pgfn, pgfw and pgfc corresponding to the polymer at the exit of the reactor for two of the selected experimental cases.
The ordering of the curves, with pgfn [greater than] pgfw [greater than] pgfc is always respected for the cases tried.
It was found that all distributions could be predicted fairly well from pgfc. The best predictions for PE-1 and EVA-17 were obtained using Stehfest's inversion.
When calculating pgf from mass balances, pgfn must be calculated prior to pgfw, which in turn must be calculated before pgfc. This is so because a system of coupled equations results.
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- PGE1 transporter