Figure 7.6:

Effectiveness factor versus Thiele modulus for a first-order reaction in a sphere (log-log scale).

Code for Figure 7.6

Text of the GNU GPL.

main.m

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% Copyright (C) 2001, James B. Rawlings and John G. Ekerdt
%
% This program is free software; you can redistribute it and/or
% modify it under the terms of the GNU General Public License as
% published by the Free Software Foundation; either version 2, or (at
% your option) any later version.
%
% This program is distributed in the hope that it will be useful, but
% WITHOUT ANY WARRANTY; without even the implied warranty of
% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
% General Public License for more details.
%
% You should have received a copy of the GNU General Public License
% along with this program; see the file COPYING.  If not, write to
% the Free Software Foundation, 59 Temple Place - Suite 330, Boston,
% MA 02111-1307, USA.
%
% Revised 8/14/2018

nphi = 50;
phi = [logspace(-2,2,nphi)]';
eta = (1./(tanh(3*phi)) - 1./(3*phi))./phi;

line1 = 1./phi;
phiasy = logspace(-2,log10(2),nphi)';
line2 = ones(nphi,1);
tmp = [phi eta line1 phiasy line2];

save -ascii etasphere.dat tmp;

if (~ strcmp (getenv ('OMIT_PLOTS'), 'true')) % PLOTTING
    loglog(tmp(:,1), tmp(:,2:3), tmp(:,4), tmp(:,5));
    % TITLE
end % PLOTTING