Swirling Flow in a Permeable Tube at Slowly Expanding and Contracting Wall

Table 1

Convergence and accuracy of HAM solution at different orders of approximation when , , , , , and .

Order of approximation	()	()	Residual error for (8)	Residual error for (6)	Optimal	Optimal
2	−3.60185569	0.98963266			−0.897	−0.916
5	−3.60529192	0.98947505			−0.948	−0.992
10	−3.60529631	0.98947481			−0.932	−0.997
15	−3.60529631	0.98947481			−0.845	−0.832
20	−3.60529631	0.98947481			−0.689	−0.865
25	−3.60529631	0.98947481			−0.580	−0.621
30	−3.60529631	0.98947481			−0.478	−0.518