THE DISTANCE TRAVELLED FROM REST TO TERMINAL VELOCITY BY A SPHERE IN AIR

Authors
  1. Mellsen, S.B.
Corporate Authors
Defence Research Establishment Suffield, Ralston ALTA (CAN)
Abstract
The distance travelled as a function of velocity for falling spherical drops starting from rest was calculated. This was done for 1 to 5 millimetre spheres to determine the travel distance required for designing experiments where velocities approaching terminal are required. The results showed that 80 percent of terminal velocity is reached after spheres of unit density and diameter of 5 millimetres have fallen from rest through a distance of 7.5 metres. To achieve 85 percent of terminal velocity, an increase of only 5 percent, 9.5 metres is required. Also calculated was the velocity of particles blown upward from rest in a vertical airstream. This was done to provide information for comparison of experimental to theoretical results on the effect of dust on aerodynamic drag.
Report Number
TN-425 —
Date of publication
15 Sep 1978
Number of Pages
43
DSTKIM No
78-03289
CANDIS No
83960
Format(s):
Hardcopy;Originator's fiche received by DSIS

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