
%0 Journal Article
%A Hoper, VD 
%A Grant, AM 
%T The Influence of a Horizontal Wall on the Motion of a Falling Oil Drop
%J Australian Journal of Chemistry
%D 1948/03/01
%V 1
%N 1
%P 28-40
%K 
%R https://doi.org/10.1071/CH9480028
%U https://www.publish.csiro.au/paper/CH9480028 
%X A study has been made of the effect of a horizontal wall on the motion of oil drops of radii ranging from 5 &#181; to 15 &#181; falling in air. The following conclusions were reached.  Provided that z/a, the ratio of the distance z of the oil drop from the wall to its radius a, is greater than 20, the resistance W to its motion is satisfied by the formula given by Lorentz, namely : W = 6&#960;&#951;av (1 + 9/8 a/z). For z/a ranging from 2 to 500, the coefficient of a/z may be expressed empirically in the form f(z/a) = k1 + k2 a/z where k1 = 1.08 &#177; 0.05 and k2 = 1.4 &#177; 1.0. 
