10 



Baffle 



Nozzles 



Figure 4 - Details of Three Arrangements of Meter Chamber 



The inside diameter of the inverted test tube forming the glass dome is 48 millimeters. 



All nozzles used were "atomizing" nozzles designed to produce a hollow cone spray. 



RESULTS OF EXPERIMENTS 



Figure 5 shows typical results of the tests of the response characteristics of the 

 meter. The circles represent the measured values of gas pressure in the chamber while the 

 broken line indicates the simulated step change in the input. The solid line was obtained by 

 fitting a curve of the form given by Equation [3] to the observed pressure readings; the re- 

 sponse time Tyy was chosen to give the best fit. This procedure determines the value of the 

 mixing efficiency rj since V, Q, and /Syy are known. 



Table 2 summarizes the results of eleven test runs with four different combinations of 

 nozzle size and internal arrangement. For each run, the arrangement, flow rate, gas-space 



*Spray Systems Company type l^L,Nl, %LN2, ViLN3 and '^LN4. The smaller numbers designate nozzles producing 

 a finer spray. The flow rate obtained is roughly proportional to the designating number and to the square root of 

 pressure drop across the nozzle; it is about 120 cc/min. for a single No. 2 nozzle at 20 psi. 



