Vertical Airflow Wind Tunnel for Spray Particulate Analysis
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Solution Overview
Problem
Existing wind tunnels for agrochemical spray analysis face challenges in accurately measuring spray particulates due to limitations in design, particularly in simulating the effect of gravity on moving particles and the inability to perform a wide range of experiments, leading to inefficiencies in assessing spray drift and quality.
Innovation Solution
A wind tunnel with a vertically downward airflow system and a spray chamber with a transparent sidewall allows for the analysis of spray particulates by spatial and temporal methods, enabling more accurate measurements of particle size and drift reduction potential, and accommodating various airflow configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If horizontal airflow is used in existing wind tunnels, then the measurement system can be simplified, but the accuracy of spray particulate measurement deteriorates due to gravitational effects on moving particles
Solution Approach 1:
The patent inverts the conventional horizontal airflow configuration by implementing vertical downward airflow through the spray chamber. This inversion allows gravity to act in the same direction as the airflow, eliminating the gravitational deviation problem that occurs in horizontal configurations where particles separate from the airflow path due to gravity acting perpendicular to the flow direction.
Solution Approach 2:
The patent transitions from a horizontal measurement plane to a vertical measurement plane by introducing vertical downward airflow. This dimensional change allows the measurement system to capture spray particulates along the vertical axis where gravity acts parallel to the airflow, enabling more accurate representation of real-world spray drift conditions while maintaining measurement feasibility through transparent sidewalls for optical detection.
2Device complexity
If the spray chamber has the same dimensions as the airflow duct, then the device structure is simplified, but the flexibility and range of experiments are limited
Solution Approach 1:
The patent segments the wind tunnel system into distinct functional zones: an airflow duct for generating and directing vertical downward airflow, and a separate spray chamber with transparent sidewalls for measurement. This segmentation allows the spray chamber to be optimally sized and configured for various experimental setups while maintaining connection to the airflow system, thereby increasing experimental flexibility without significantly complicating the overall structure.
Solution Approach 2:
The spray chamber with transparent sidewalls serves multiple functions: it accommodates vertical downward airflow, allows optical measurement of spray particulates from multiple angles, and can be configured for different spray tips and agricultural chemical applications. This multi-functional design enables a wide range of experiments to be conducted within a single chamber structure.
3Measurement precision
If transparent sidewalls are added to the spray chamber, then the ability to analyze spray particulates is improved, but the device complexity increases
Solution Approach 1:
The patent applies transparent material selectively to the sidewalls of the spray chamber while maintaining structural integrity and appropriate opacity for other components. This localized application of transparency enables optical measurement of spray particulates through the sidewalls without requiring the entire chamber to be transparent, thus balancing measurement capability with structural requirements and minimizing overall complexity.
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
This configuration enhances the accuracy and flexibility of spray particle measurements, allowing for a broader range of experiments and more realistic modeling of spray drift, thereby improving the assessment of spray quality and drift reduction technologies.
Implementation Method 1
the airflow system is capable of delivering air vertically down through the spray chamber
Implementation Method 2
analyzing the spray particulates through the transparent sidewall
Data Source
AI summary
A wind tunnel and method of use thereof. The wind tunnel has an airflow system which is capable of delivering air vertically down through, and optionally horizontally across, a spray chamber having transparent sidewalls, wherein spray particulates produced in the spray chamber can be analyzed through the transparent sidewalls, preferably by use of a laser. The dimensions of the spray chamber are preferably greater than that of the airflow system. The use of the wind tunnel enables a wider range and more accurate spray particle measurements, especially for an agrochemical composition, to be made in a single test environment.