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Drift potential of tilted shielded rotary atomisers based on wind tunnel measurements

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Academic year: 2021

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Sofiene  Ouled  Taleb  Salah,  Mathieu  Massinon,  Nicolas  De  Cock,  

Bruno  Schiffers  and  Frederic  Lebeau  

 

University  of  Liege,  Gembloux  Agro-­‐Bio  Tech  

 

(2)

 

Context  

 

Δ

adhesion,

●

rebond ,

x

 fragmentaBon  

DriC  

FragmentaBon  

Extended  droplet  size  

distribuBon  

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Controlled  Droplet  Applica?on  (CDA)…  !  

Rotary  atomiser    

(GRASP)    

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                       Compromise  in  termes  of  droplet  sizes  …  

AnB-­‐driC  nozzle  (Hardi  Injet  015)  

Rotary  atomiser  (Micromax  120)  

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ObjecBve  

The  objec?ve  is  to  inves?gate  whether  a  rotary  atomizer  with:  

 

 -­‐    a  60°  forward  ?lt  

 -­‐    a  reduced  driUable  droplet  propor?on  and  a  VMD              

centered  around  300  µm  

 

(6)

DriC  trials  

v   v   v   v   v  

collectors lines (PTFE) (300 mm length )

2,0 meters

§  Temperature: 20 oC ± 1°C. §  Relative humidity: 80% ± 5%.

§ Spray mixture: Tap water+0.1%

Break Thru.

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Spray  characterisBcs    

Buse V10 (µm) V50 (µm) ou VMD V90 (µm) Span (V90-V10/ V50) Percentage by volume of droplets <100 µm (%) Percentage by volume of droplets > 350 µm (%) CDA (5000 rpm) 181 271 347 0.60 0.70 8 CDA (3500 rpm) 221 310 398 0.57 0.49 27 Hydraulic nozzle (Teejet XR 110 02) 113 208 361 1.18 6 11 Anti-drift nozzle (Hardi Injet 015) 177 325 514 1.03 0.99 41

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 VerBcal  profile  of  driC  at  2.0  meteres  

 

0   10   20   30   40   50   60   70   0   1   2   3   4   5   6   C ol le ctor s p os iti on s (c m) Drift (%)     Teejet  XR  11002_0°_208  µm  VMD_2m/s   Hardi  Injet  015_0°_325  µm  VMD_2m/s   Micromax  5000  rpm_60°_271  µm   VMD_2m/s   Micromax  3500  rpm_60°_310  µm   VMD_2m/s   Teejet  XR  11002_60°_208  µm  VMD_2m/s   Hardi  Injet  015_60°_325  µm  VMD_2m/s  

ISO  22856  

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(10)

Cumula?ve  driU  measurements  at  2.0  m  downwind  

CDA 3500 rpm CDA 5000 rpm Hydraulic nozzle Teejet XR11002 Anti-drift nozzle Hardi Injet 015 Nozzle orientation

60° forward 60° forward vertical

60° forward vertical 60° forward Drift (%) 2.540 3.539 9.105 13.741 0.708 1.114 STD 0.12 0.17 0.591 0.75 0.04 0.07

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Poten?al  DriU    Index  (DIX)    

Micromax 120

3500 rpm

Micromax 120

5000 rpm

Teejet XR11002

Hardi Injet 015

Nozzle

orientation

60° forward

60° forward

vertical

60°

forward

vertical

60°

forward

DIX (%)

36.53

44.05

48.27

100

8.43

10.98

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Conclusion  

-­‐60°  forward  Blted  nozzles  increased  driC  relaBve  to  verBcally  oriented  nozzles.  

 

 

-­‐Rotary  atomisers  with  a  narrow  droplet  size  distribuBon  centred  around  a  VMD  

of  300µm  do  not  significantly  reduce  driC  comparaBvely  to  hydraulic  nozzles.    

 

 

-­‐Turbulence  and  lower  entrained  air  flows  may  explain  driC  at  higher  sampling  

locaBons  of  rotary  atomisers  comparaBvely  to  hydraulic  nozzles.    

(13)

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