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Assessment of drift potential of sprays produced from tilted shielded rotary atomizers compared to hydraulic nozzles

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 Slide    1/10  

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

Bruno  Schiffers  and  Frederic  Lebeau  

 

University  of  Liege,  Gembloux  Agro-­‐Bio  Tech  

 

 

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3/11    

Sofiene  Ouled   Taleb  Salah  

         Compromise  in  termes  of  droplet  sizes  …  

An>-­‐driK  nozzle    

(Hardi  Injet  015)  

• 

VMD=325  

• 

Span=1.1  

Rotary  atomiser  

 (Micromax  120)  

• 

VMD=270  

• 

Span=0.6  

Horizontal  release  of  

droplets  

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ObjecKve  

To  inves>gate  whether  a  >lted  shielded  rotary  atomizer  can  reduce  

driK  poten>al  to  acceptable  levels.  

Simula>ng  the  behaviour  of  droplets  in  the  atmosphere  

Combined  ballis>c  and  random-­‐walk  models    

Method  

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5/11   Sofiene  Ouled   Taleb  Salah  

Wind  profile  

Wind  velocity  (m/s)   He ig ht  (m)   Ini>al  condi>ons:   •  Nozzle  height=  0.5  m   •   Sta>c  nozzle   •  Crop  height=  0.1  m   •   Wind  velocity=  2  m/s      

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Assessment  of  the  travelled  distance  by  driIable  droplets  

v   v   v   v   v   (Z)   (X)   (Y)   Static nozzle

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7/11  

Rotary  atomiser

:  VMD=270  µm;  Span=0.6  ;  EmiSed  droplet  velocity=  25  m/s  

Hydraulic  nozzle:  

VMD=270  µm;  Span=1.1  EmiSed  droplet  velocity=  10  m/s  

90°   60°   30°   0°   co or di nate s  of  dr ops   al on g   y   ax is  (m )   co or di nate s  of  dr ops   al on g   y   ax is  (m )   0°   C.  of  dr ops   al on g  y  (m)    (m)      (m)      (m)      (m)      

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Droplet  behaviour  at  2.0  m  from  nozzle  axis  

v   v   v   v   v   Collectors 2,0 meters (Z)   (X)   (Y)   Nozzle

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9/11  

Rotary  atomiser

:  VMD=270  µm;  Span=0.69  ;  EmiSed  droplet  velocity=  25  m/s  

Hydraulic  nozzle:  

VMD=270  µm;  Span=1.1;  EmiSed  droplet  velocity=  10  m/s  

90°   60°   30°   0°   0°   (µm)   (µm)   (m)   (m)   (m)   (m)   (µm)     (µm)    

Diameters  of  drops  collected  at  2  m  (µm)    

  He ig ht  (z)  (m )      

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Rotary  atomiser

:  VMD=270  ;  Span=0.69  ;  EmiSed  droplet  velocity=  25  m/s  

Hydraulic  nozzle:  

VMD=270;  Span=1.1;  EmiSed  droplet  velocity=  10  m/s  

90°   60°   30°   0°   Volum e  of   dr iK ab le  d ro pl ets  c ol le cte d   at  2  m  (%)   Volum e  of   dr iK ab le  d ro pl ets  c ol le cte d   at  2  m  (%)   Height  (m)   Height  (m)   Height  (m)   Height  (m)   dr iK ab le   co llected  

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11/11  

Sofiene  Ouled   Taleb  Salah  

Conclusion  

-­‐  Forward  Klted  rotary  atomisers  increased  driI  relaKve  to  verKcal  orientaKons.  

 

 

-­‐  VerKcal  rotary  atomisers  with  a  narrow  droplet  size  distribuKon  centred  around  

a  VMD  of  300µm  reduce  driI  comparaKvely  to  hydraulic  nozzles.    

 

 

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13/10   Sofiene  Ouled   Taleb  Salah   19/08/2014   FragmentaKon   DriI  

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