Aa. Wragg et al., FREE CONVECTIVE MASS-TRANSFER AT DOWN-FACING HORIZONTAL SURFACES WITHFREE OR COLLARED EDGES, International communications in heat and mass transfer, 25(2), 1998, pp. 175-182
Free convective mass transfer at down-facing horizontal surfaces was e
xperimentally studied using the electrochemical technique with emphasi
s on the influence of the edge condition. It was found that the mass t
ransfer rate is significantly lower for collared surfaces which was-ex
plained in terms of the different fluid flow conditions at the disc ed
ge. The previous literature was critically reviewed and reported corre
lations were compared with those found for the present case, which, fo
r discs with free edges, was found to be Sh(d) = 2.08Ra(d)(0.178) for
Ra-d in the range 7 x 10(3) to 1 x 10(11). (C) 1998 Elsevier Science L
td.