Mass transfer from a drop—II. Theoretical analysis of temperature dependent mass flux correlation

Abstract A new expression of the droplet Sherwood number (Sh) is presented based on the theoretical treatment of the temperature dependent gaseous diffusion coefficient. The experimentally specified parameters were correlated by means of recent data on water droplets evaporating in the flow field. The mass flux correlation is given as a function of the Reynolds (Re) and Schmidt (Sc) numbers, and it turned out to be Sh = (2.009+0.514Re 1 2 Sc 1 3 ) . The Sherwood number should be multiplied by a strictly theoretical correction factor which depends on the droplet and gas temperatures and which is order of 0.9, if the temperature deviation is order of 100 K. The introduction of the correction factor seems to remove a discrepancy existing between the earlier theoretical treatments and experimental data.

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