Defra - Department for Environment, Food and Rural Affairs.

Science Search

Science and Research Projects

Return to Science Search homepage   Return to Project List

An investigation of the causes and consequences of variable nozzle performance - PA1731

Description
Recent work has shown that some nozzles are very variable in their performance. This may result in apparently random changes in flow rate, atomisation characteristics, deposition and drift. There are several possible causes – those relating to fluid flow through the components of the spraying system and the break up mechanisms, which are likely to be chaotic processes, and those relating to environmental conditions such as temperature.

It is important to determine the consequences of any variation since there are implications for the measurements that are made to compare performance of different spraying techniques or spray liquids. Traditionally, measurements of average performance are made, whereas the variability of a particular system may be an equally important parameter to determine. The ability to determine variability will depend upon the measurement technique and the experimental protocol adopted.

The main objectives are to evaluate spray measurement techniques and determine variation in spray characteristics on a range of timescales for common nozzle types and spray liquids and to assess the consequences of variation in nozzle performance for measurements of spray drift in the wind tunnel and spray deposit on real and/or artificial targets

This will result in improvements in designs of experimental protocols and in analysis of experimental data. This will benefit PSD by improving the quality of data in support of registration and by providing scientific information to underpin the development of measures to protect the environment (such as LERAPs). It will benefit DEFRA in allowing improved interpretation of results related to pesticide application, thereby increasing the cost-effectiveness of research. It will also benefit the industy in providing appropriate data on which to base guidance and advice to customers
Objective
1. Evaluate spray measurement techniques and determine variation in spray characteristics on a range of timescales for common nozzle types and spray liquids

2 Evaluate the variation in spray characteristics due to changes in temperature of both spray liquid and air

3. Determine the variability in nozzle output and spray distribution patterns on a range of timescales

4. Assess the consequences of variation in nozzle performance for measurements of spray drift in the wind tunnel and spray deposit on real and/or artificial targets
Project Documents
• Final Report : An investigation of the causes and consequences of variable nozzle performance   (5297k)
Time-Scale and Cost
From: 2001

To: 2003

Cost: £80,047
Contractor / Funded Organisations
Silsoe Research Institute (BBSRC)
Keywords
Application              
Pest and Weed Control              
Pesticide use              
Plants and Animals              
Fields of Study
Pesticide Safety