311 



icm- 



icm- 

 1.0 



0.1 



0.0 1-H 



O001 



V,^ 



Lnj-i 



Test 59 

 Meas. Time : 

 tpn = 19-3 sec 

 ?o =13N/cm2 



n =101.5RPM 

 Vs =21./;kn 



20 1,0 60 



1-12-1977 Wind Force 





10.O 

 10 

 0.1 



001 



^^ 



0.001 



^. 



80 100 /^m 



— -Diameter 

 3 Beauf. 



Test 65 

 Measuring Time : 

 tm = 1-59 sec 

 S„ = 159N/cm^ 



fJ~u- 



n= 101.3 RPM 







20 iO 



50 



80 



100 /U-m 

 — Diameter 

 2-12-1977, Wind Force; 2-3 Beauf., Heavy Swell 



FIGURE 16. Nuclei distributions in seaways. 



was detected in Test 47 - Figure 15, Tests 60 and 

 62 - Figure 17 and Tests 90 to 92 - Figure 20. 

 The absolute maximum was detected in Test 61 - 

 Figure 17 and Test 65 - Figure 16. The strong 

 fluctuation of the number of nuclei per cm {nuclei 

 concentration 5o) can be read from the diagrams. 

 Figures 15 to 17 as well as 18 and 19 show spectra 

 which have been measured in different seaways. 

 During the performance of Tests 47 to 52 (Figures 

 15 to 17) tiiere was a seaway and swell from astern. 

 The strong pitching motions of the "Sydney Express" 



Cell 2 000 

 Cell 



Cell 2000 

 Cell 



fo = 15N/cm3 

 1 5 9 13 17 21 25 No of Rev 



— »■ Time 



Test 60 ; Measuring Time : 1^=17 03 sec 

 21 25 29 33 37 , No^ of R ev 

 / — — Time 



Test 61 , Measuring Time : ^^n' ^'^^ ^^<^ 

 F =219N/cm3 



FIGURE 18. Nuclei distributions in a seaway. 



resulted in a strong fluctuation of the nuclei 

 concentration, i.e. from Co = 21 N/cm^ to Co = 219 

 N/cm^ in the Tests 62 and 61 - Figure 17. Depending 

 on the quality of the water, either swarms of 

 bubbles or clear water, which hits the control 

 volume of the laser beam, 2000 nuclei were counted 

 more or less quickly. The process of counting the 

 2000 bubbles is demonstrated in Figure 25 for two 

 cases . There 1ihe analog-output voltage of the 

 memory is plotted against time and propeller revo- 

 lutions respectively. The output voltage of 1 Volt 

 is reached by the memory when its 2000 cells are 

 filled. In Test 61, 2000 bubbles were counted 

 within 1.16 s and in Test 60 within 17.03 s at an 

 almost linear processing of the output voltage. 

 Figures 18 and 19 show also a series of nuclei 

 spectra measured, one immediately after the other, 

 at a seaway of Beaufort 4. At this series the 

 direction of liie seaway was, however, athwartships 

 up to "slightly from fore". The seaway motions of 

 the "Sydney Express" (length 210 m) were very 

 small in this case. Subsequently the number Co of 

 nuclei per cm^ was higher than the smallest number 



Test 60 

 Measuring Time: 

 1703 sec 



n=101.2RPM 



Test 62 

 Measuring Time : 

 tm = 12.33sec 

 5o= 21 N/cm^ 



n = 10l.0RPM 

 Vs=21.3kn 



40 60 

 Wind Force 

 FIGURE 17. Nuclei distributions in a seaway. 



120 ^m 

 — » Diameter 

 3 Beaufort with Swell 



Test 93 

 Meas. Time : 

 tm = il2 sec 

 So = 62N/cm3 



n=101.0RPM 

 Vs=21.3l<n 



Test 9i 

 Meas- Time • 

 tm = 5. 63 sec 



= 45N/cm^ 

 n =101.0RPM 



Test 95 

 Meas. Time : 

 tm = i.20sec 

 ?Q=61N/cm3 



n =101.0RPM 

 Vs =21.2 kn 



80 100 /um 

 — » Diameter 

 5-12-1977; Wind Force : C Beaufort 



FIGURE 19. Nuclei distributions in a seaway. 



