Subtopic: Functional requirements, principles of working, construction and operation of manual, animal, tractor and renewable energy operated equipment for tillage, sowing, planting, fertilizer application, inter-cultivation, spraying, mowing, chaff cutting, harvesting and threshing
Question Statement:
The Sauter mean diameter of liquid droplets of a hydraulic spray is
Options:
(A) median diameter of droplets
(B) surface area of droplets
(C) mean diameter of droplets
(D) volume to surface ratio of droplets
Official Answer Key:
D
Step-by-Step Solution & Explanation
The Sauter mean diameter (D₃₂) is defined as the diameter of a hypothetical droplet whose volume-to-surface-area ratio equals that of the entire droplet population — i.e. D₃₂ = 6×(total volume)/(total surface area), effectively a volume-to-surface ratio (scaled by 6). This makes it especially meaningful for spray-deposition and evaporation calculations where surface-to-volume behaviour matters. It is neither the arithmetic mean diameter (C) nor the median diameter (A, the diameter that splits the population in half), so option (D) is correct.
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