Flow rate (mL/s)

Velocity of sudden expansion pipe (m/s)

Pressure measuring height before sudden expansion (mm)

Optimal pressure measuring height after sudden expansion (mm)

Actually measured value of local head loss (m)

Theoretically calculate value of local head loss (m)

Local resistance coefficient

24.916

0.080

74.37

74.46

0.00037

0.00010

1.15

41.300

0.132

72.60

72.64

0.00123

0.00028

1.38

58.851

0.188

70.31

70.46

0.00242

0.00057

1.34

13.433

0.043

56.52

56.48

0.00017

0.00003

1.85

40.292

0.129

54.23

54.06

0.00138

0.00027

1.63

53.607

0.171

52.68

52.57

0.00224

0.00047

1.50

28.093

0.090

55.20

55.17

0.00062

0.00013

1.50

95.181

0.304

45.65

45.93

0.00645

0.00149

1.37

117.561

0.376

30.23

30.93

0.00956

0.00228

1.33

102.531

0.328

22.45

23.17

0.00709

0.00173

1.29