FLUID FRICTION 



177 



25 



10 



,0. 



10 ft 20ft 30ft 40ft 50 fL 60 ft 



Length of Surface I Ft wide 

 FIG. 90. 



3 4 5 



Speed m knots 



FIG. 91. 



jvhere S = area of surface, it was found that 

 f (a) depends on the surface 



(b) decreases with an increase 111 lengtn, becoming approximately 

 f constant when the length is large. 



i (c) is independent of the pressure. 



\ (d] is proportional to the density of the fluid and diminishes very 

 I slightly as the temperature increases. 



H.A. N 



