REYNOLDS 

 NUMBER 



8 + 



6 



4__ 



2-- 



10^- 

 8 

 6 



4-- 



2-- 



8 

 6 



4 + 



10^- 

 8 



6. 



10" 



V 



SPEED 



(KNOTS)(FT/SEC) 



100^ 

 V. 80 -" 



REFERENCE 

 LINE 



60 

 40 - 



20 - 



100 

 h 80 

 60^ 



- 40 



10- 

 8 



6 



4 



- 20 



1- 

 0.8 



0,6 

 0.4 



0.2 



0.1 — 



^< 



10 

 8 



6 



-- 4 



LINE A AND 

 LINE BRASS 

 2 THROUGH SAME 

 POINT ON 

 REFERENCE LINE 

 1 

 h 0.8 



0.6 

 h 0.4 



-0.2 



-0.1 



/ 

 LENGTH 



(IN) (FT) 



1^100 

 1,000 -_ 80 



800 - 



600 -- 



--40 

 400 -" 



V.\r>e ' 



^. 



- 20 



200 - 



S 



\ 



100—- 

 80-1 

 60-- 



40 - 



W 



V 



2- 



1— ' 



60 



10 

 8 

 6 



-- 2 



20 - 



— 1 

 10—- 0.8 



^1-0.6 

 6-- 



-- 0.4 

 4-- 



-- 0.2 



— 0.1 



KINEMATIC 

 VISCOSITY 



CENTI- \ 



STOKES/ (FTVSEC) 

 100^T_10-3 

 80=1 8 



60 ^: 6 



40 - 



20 - 



10— 



'- 4 



Air 



h 2 60°F 

 ^^40 



■10-" 



6 - 

 4 - 



2- 



\ 



1 — 

 0.8 



0.6 



0.4- 



- 6 



- 4 



0.2 - 



0.1 — 



20 

 0°F 



SEAWATER 



tr_l 30° F 



40 



: ^-50 



_10-"s~^60°F 



- 8 



- 6 



- 4 



1-10' 



To find the Reynolds number, find the crossing point on the reference line for the product of the 

 given speed and length; for example, line A for a velocity of 10 ft/sec and a 30-ft length. Then, 

 using this reference point, find the quotient for the given viscosity; for example, line B for a 

 viscosity of 1.2 X 10"^ (seawater at 60°F). The resulting Reynolds number is given by the 

 intersection of line S and the Reynolds scale— 2.5 X 10' for the example. 



Fig. 8.25 Nomogram for finding Reynolds Number. 



394 



