DENSITY GRADIENTS NEAR A LIQUID/AIR INTERFACE.
NAVAL RESEARCH LAB WASHINGTON D C
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An experimental investigation of the density variations which occur in a liquid near a liquidair interface was conducted by means of a Mach-Zehnder interferometer and a gas laser light source. The liquid used in this investigation was distilled water. Experiments were made under two conditions. The first condition was evaporation from an undisturbed interface. The second condition was evaporation in the presence of a submerged, heated copper tube. The quantities of interest were the variations in the interfacial temperature, the changes in thickness of the interfacial thermal layer, and the temperature gradient at the interface. The depth of the submerged, heated surface varied from 10.2 cm to 76.2 cm, and the temperature difference between the submerged, heated tube and the surrounding liquid bulk temperature varied from 0.0C to 5.0C. The results gave an indication of the behavior of the thin thermal liquid layer at the interface. The mechanism responsible for the changes in the thermal layer was due to a momentum disturbance at the underneath side. The small disturbances were sufficient to alter the frequency and magnitude of the changes that normally occur at an evaporating interface. Author
- Physical and Dynamic Oceanography