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ARS Home » Midwest Area » Wooster, Ohio » Application Technology Research » Research » Publications at this Location » Publication #61121
Title: COMPUTER MODEL OF FACTORS INFLUENCING SPRAY DRIFT

Author
item Reichard, Donald
item ZHU, HEPING - OSU/OARDC-AGRIC ENGR DEPT

Submitted to: Proceedings of National Conference on Pesticide Application Technology
Publication Type: Proceedings
Publication Acceptance Date: 6/15/1995
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: A computer program was used to determine the effects of several variables on drift distances of spray droplets. Variables were initial droplet size, velocity and height of discharge, wind velocity and turbulence intensity, relative humidity, and volatility of the liquid. For relative humidity and wind velocity ranges of 20 to 80% and 0.5 to 10.0 m/s, all 50 um diameter water droplets directed downward with initial velocity of 20 m/s completely evaporated before depositing 0.5 m below point of discharge. With 20 m/s initial droplet velocity, 2.5 m/s wind velocity, 20% turbulence intensity and 50% relative humidity, 100 and 200 um diameter droplets deposited 0.5 m below point of discharge at mean downwind distances of 3.27 and 0.17 m respectively. Drift distances of water droplets as large as 200 um diameter were influenced by initial droplet velocity and height of discharge. Experimental data from tests in a wind tunnel verified the accuracy of the computer program in predicting drift distances of water droplets.