An instrument was constructed for measuring the dynamic surface tension of water solutions by the oscillating jet method. The values of the surface tension as a function of the surface age are calculated by inserting into Buhr's equation the waveparameters, density of the liquid and flow rate of the jet. The jet is formed by a hydrostatic pressure through an elliptical orifice. The cross section of the standing wave in the jet is scanned by an image sensor, from which the results are fed to a microcomputer for computing and display. The reproducibility of the measurement is better than 3 % at the age range 0.8-20 ms. The practical measurements made so far support the earlier research results, which suggest that the surface tension is a function of the surface age.
|Place of Publication||Espoo|
|Publisher||VTT Technical Research Centre of Finland|
|Number of pages||34|
|Publication status||Published - 1983|
|MoE publication type||D4 Published development or research report or study|
|Series||Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports|
Kukkonen, A., Nummipuro, J., & Virtanen, J. (1983). An instrument for measuring dynamic surface tension. VTT Technical Research Centre of Finland. Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports, No. 140