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Determination of the regime in the reverse wilson chamber at critical supersaturation measurements

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Abstract

The pressure in the Reverse Wilson Chamber (RWC) was directly measured at different rates of compression of the gas mixture. It was shown that at compression time Τ in the range from 0.06 to 0.3 s an intermediate, between adiabatic and isothermal, process took place in the chamber. To obtain the relative pressure increaseδ P m /P at from the values of the relative gas compressionδ V/V, a calibration of the experimental set-up was carried out. The calibration showed that the values of critical supersaturationSc for water condensation on hexadecane, estimated for intermediate regime of the gas compression, were reduced with respect to the values calculated when the adiabatic regime was assumed. This fact confirmed the conclusions made earlier [1–3] that the classical theory was not applicable in this case of heterogeneous phase formation and that the line tensionκ < 0 should be taken into account. Moreover, in an atmosphere of very pure argon (instead of room air [1–3]) the critical supersaturation turned out to be independent of the initial state of undersaturationS o . The more accurate values obtained for condensation of water on hexadecane were: lnS c =0.204 (instead of the maximum value obtained earlier: lnS c =0.26) andκ=−1.9×10−5 dyne (instead ofκ=−1.5×10−5 dyne).

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Chakarov, V., Zembala, M., Novozhilova, O. et al. Determination of the regime in the reverse wilson chamber at critical supersaturation measurements. Colloid & Polymer Sci 265, 347–353 (1987). https://doi.org/10.1007/BF01417935

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  • DOI: https://doi.org/10.1007/BF01417935

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