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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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
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
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/sAssessment of the travelled distance by driIable droplets
v v v v v (Z) (X) (Y) Static nozzle7/11
Rotary atomiser
: VMD=270 µm; Span=0.6 ; EmiSed droplet velocity= 25 m/sHydraulic nozzle:
VMD=270 µm; Span=1.1 EmiSed droplet velocity= 10 m/s90° 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)
Droplet behaviour at 2.0 m from nozzle axis
v v v v v Collectors 2,0 meters (Z) (X) (Y) Nozzle9/11
Rotary atomiser
: VMD=270 µm; Span=0.69 ; EmiSed droplet velocity= 25 m/sHydraulic nozzle:
VMD=270 µm; Span=1.1; EmiSed droplet velocity= 10 m/s90° 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 )
Rotary atomiser
: VMD=270 ; Span=0.69 ; EmiSed droplet velocity= 25 m/sHydraulic nozzle:
VMD=270; Span=1.1; EmiSed droplet velocity= 10 m/s90° 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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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.
13/10 Sofiene Ouled Taleb Salah 19/08/2014 FragmentaKon DriI