Table 6 Fitted parameters and goodness of fit indicators for the Power-law velocity profile model for both PVC90 and PVC63 treated pipes.

From: Application of a hydrophobic coating to a pressurized pipe and its effect on energy losses and fluid flow profile

 

Test

Re

Vmax

n

R2

MAE

RMSE

(m/s)

%

(m/s)

%

PVC90

1

1.27E+04

0.19

3.6

0.85

0.0115

7.00

0.0136

8.95

2

1.95E+04

0.28

4.5

0.89

0.0114

4.96

0.0141

6.07

3

2.13E+04

0.30

5.8

0.84

0.0136

5.35

0.0159

6.27

4

2.77E+04

0.38

6.3

0.98

0.0066

2.06

0.0084

2.55

5

3.28E+04

0.44

7.8

0.94

0.0089

2.48

0.0107

2.73

6

3.88E+04

0.54

5.9

0.96

0.0094

2.15

0.0117

2.54

7

4.40E+04

0.61

6.1

0.97

0.0118

2.37

0.0132

2.52

8

4.86E+04

0.68

5.9

0.99

0.0099

1.85

0.0120

2.06

9

5.36E+04

0.72

7.1

0.98

0.0087

1.53

0.0130

2.03

10

6.40E+04

0.89

5.9

0.98

0.0143

1.97

0.0165

2.16

11

7.48E+04

1.01

7.1

0.99

0.0098

1.24

0.0148

1.66

12

8.32E+04

1.13

7.0

0.98

0.0135

1.46

0.0172

1.73

PVC63

1

1.11E+04

0.27

2.2

0.78

0.0304

12.40

0.0368

19.49

2

1.41E+04

0.31

3.3

0.96

0.0102

3.91

0.0120

5.03

3

2.13E+04

0.41

6.4

0.95

0.0095

2.88

0.0105

2.91

4

2.74E+04

0.51

8.9

0.80

0.0178

4.28

0.0206

4.43

5

3.68E+04

0.69

8.2

0.83

0.0241

4.33

0.0272

4.35

6

4.28E+04

0.78

11.4

0.77

0.0221

3.52

0.0276

3.79

7

4.93E+04

0.92

9.4

0.89

0.0222

3.03

0.0253

3.02

8

5.54E+04

1.05

7.8

0.94

0.0242

2.86

0.0252

2.67

9

5.99E+04

1.15

7.2

0.97

0.0198

2.14

0.0205

2.01

10

6.86E+04

1.32

7.0

0.99

0.0132

1.22

0.0139

1.19

11

8.96E+04

1.73

6.7

0.99

0.0162

1.15

0.0181

1.19

12

9.36E+04

1.80

7.0

0.98

0.0206

1.42

0.0261

1.64

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