An Experimental Determination of the Drag on Liquid Drops.
Final rept. 1 Jul 77-30 Jun 80,
NEVADA UNIV RENO DESERT RESEARCH INST
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One of the primary considerations in all types of spraying operations in where the dispensed material will impact on the ground. This impact area is determined by the trajectory of the liquid drop which can be predicted if the drag is known. Each drop, depending upon its size and physical properties, will have a slightly differing drag and consequently, trajectory. Thus, a reliable calculation of an impact area can only be done if the effects of appropriate physical properties upon the drag are known. The experiment reported herein was designed to provide the needed understanding of the effects of physical properties upon the drag of liquid drops. The fall velocity, from which the drag can be calculated, was measured for five different liquids of varying viscosity and surface tension. In addition, one of the liquids was thickened in order to change the viscosity while not affecting the surface tension, thus isolating the effect of viscosity on drag. Thickening was accomplished with two different thickeners, one of which produced non-Newtonian properties. Thus, any differences in the rheological properties of Newtonian and non-Newtonian liquids were tested. With the viscosity effects isolated, the effect of surface tension alone was then determined. Author
- Physical Chemistry
- Fluid Mechanics