Venturi Spraying Tip for Homogeneous Aerosol Droplet Generation
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Solution Overview
Problem
Current pneumatic backpack sprayers for controlling vector insects that transmit diseases, such as dengue, malaria, and yellow fever, often fail to produce a homogeneous spectrum of droplets within the <50 μm aerosol range, leading to reduced biological efficacy and limited dispersion, especially in difficult access areas.
Innovation Solution
A Venturi-type spraying tip that utilizes a high-speed air flow to create a low-pressure zone, disrupting liquid surface tension and forming droplets of adequate dimension (<50 μm) for effective aerosol distribution, with a compact design adaptable to powered backpack equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional pneumatic spraying tips are used, then the equipment can spray liquid, but the droplet size spectrum is not homogeneous and does not consistently achieve aerosol range (<50 μm)
Solution Approach 1:
The nozzle is divided into distinct functional zones: a Venturi section for pressure reduction and liquid suction, a mixing chamber for air-liquid integration, and a discharge section for droplet formation. This segmentation allows each zone to optimize its specific function, ensuring homogeneous aerosol droplet generation throughout operation.
Solution Approach 2:
The invention employs pneumatic principles by using compressed air flow through the Venturi section to create negative pressure that draws liquid into the air stream. The high-velocity air flow atomizes the liquid, producing consistent aerosol droplets in the <50 μm range through controlled pneumatic interaction rather than mechanical pressure alone.
2Speed
If larger droplets are used for spraying, then the spray can be delivered further, but the droplets are not absorbed by insects due to their minute size requirement
Solution Approach 1:
The nozzle controls the critical parameter of droplet size by adjusting the air-to-liquid ratio and velocity in the mixing chamber. By optimizing these parameters, the system produces droplets in the specific <50 μm aerosol range that insects can absorb, while the high-velocity air stream maintains sufficient delivery distance through enhanced spray penetration.
3Manufacturing precision
If the spraying tip design is complex, then droplet formation can be controlled, but the device becomes difficult to maintain and repair
Solution Approach 1:
The Venturi nozzle design achieves multiple functions within a single integrated component: it reduces pressure, sucks in liquid, mixes air and liquid, and forms droplets. This multi-functionality in one element simplifies the overall structure, making the nozzle easier to manufacture, install, and maintain compared to multi-component systems while maintaining precise droplet formation control.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides a consistent and efficient generation of aerosol-sized droplets, enhancing biological efficacy and allowing for effective application in closed and hard-to-reach areas by ensuring adequate dispersion and control of vector insects.
Implementation Method 1
a first constriction (venturi) which, through low pressure, allows the suction of the liquid
Implementation Method 2
The geometry of the tip (11) causes the increase in the speed of the air flow and the consequent reduction in the pressure
Implementation Method 3
disrupting the liquid surface tension and, consequently, forms droplets of adequate dimension
Data Source
AI summary
A device configured for clamping onto the discharge tube of a powered air blower has a projecting control element containing a filter and interchangeable color-coded valve parts for selecting a rate of fluid discharge. Fluid is discharged into the air flow at a first air flow constriction (venturi) that leads into a second air flow constriction for developing aerosol droplet sizes (<50 μm). The device is useful with backpack equipment for controlling disease vector insects in inaccessible areas.