Table 2 Grid independence test for sheet and tube collector.

From: Assessment of economic, thermal and hydraulic performances a corrugated helical heat exchanger filled with non-Newtonian nanofluid

No

Nodes

Nu

1

482,154

83.58

2

812,010

70.92

3

1,565,841

67.44

4

2,245,615

58.82

5

2,945,462

56.61

6

3,132,341

56.39

7

3,571,657

56.28

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