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The low value of ß at small Re is probably due to error in determining the drop temperature with a thermocouple. This would explain why Tverskaia1s value of Nu at Re = 0, calculated from the rate of evaporation and the measured /oo— to , was 2· 8 instead of 2. Similar results were obtained by Sokol'skii and Timofeyeva [63] with drops of water of r = 0*5-1 mm. at Re > 200 found that Sh = 0·52χ Re06corresponding to p» 0·29. In their experiments with water drops at 25-100°, Fedoseyev and Polishchuk [64] obtained results which contradicted both theory (see [65]) and the data of all other investigators.

Comparison of eq. 3) gives α = 1·03*Ι. 42·1(Γ3//Ρ = β. 7) wherewiand ma are the masses of the vapour and gas mole- 30 EVAPORATION AND DROPLET GROWTH cules, n2 is the concentration of the latter, 312 is the sum of the radii of the vapour and gas molecules [it is assumed in eq.. 7) that nx < n2 ]. Hence D = :,/H-v/ ( i + m^m«) = = 12· 5 h = 46500/. Since D =29·4/P, IP = 29·4/46500 and β = 3·8. 2), in which a is in all cases nearly unity, while β is 13*7, 2*05 and 3·3 respectively. However, as pointed out "before, these results must he considered tentative.

The dimensions of the droplets used in obtaining these experimental points are also given. Comparison of the values of K and Sc, while the latter is varied from 0·7 to 2-7, shows that K is proportional to ScV3. His experiments therefore confirm the accuracy of eg. 23) and the experimental value β = 0*276 is not very different from Shvets's theoretical value of 0*34 (see p. 40). The rather large scatter of experimental points for the drops of water was ascribed by Prtfssling to errors in determining the humidity of the air, and for the spheres of naphthalene to the irregularity of the surface.

### Physics Reports vol.108

by Ronald

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