- 79 - 



may have blocked the transducer filter screens and diaphragm. 



The frictional pressure gradient along the inside length 1 of 

 a circular pipe is (Peer less , 1967) : 



AP 



f 128 V-Q 



— =—4- (5.1) 



irD 



where APf = frictional pressure drop 



p = coefficient of dynamic viscosity 



Q = volumetric flow rate 



D = inner diameter of tubing. 



Figure V-1 presents a schematic representation of the differential 

 transducer and sensors. The fluid flow along each arm, Q^ and Q2 , 

 that results from difference in pressure between the system's sensors 

 may be expressed from Eq. 5.1 as: 



2l = ^l^^l " ^c ^ ^^-23) 



22 =^2(^C2 " ^2^ (5.2b) 



wh pre 4 



^"^ 128 u Z (5.3) 



n n 



