Abstract
An experimental study of the flow of a water film over a heated surface for Re = 15-50 was performed. The influence of the development of thermocapillary instability on the wave amplitudes, the deformation of the surface of the liquid film, and the formation of the first stable dry spot on the heater are investigated. It is shown that the interaction of waves with thermocapillary structures can lead to an increase in the critical heat flux corresponding to the rupture of the liquid film, as compared with the data known in the literature.
Highlights
Film flows are widely used in various industrial technologies and apparatuses, and understanding the processes occurring in flowing films is an important task for the implementation of such devices
It is shown that the interaction of waves with thermocapillary structures can lead to an increase in the critical heat flux corresponding to the rupture of the liquid film, as compared with the data known in the literature
At Z > 23 mm the liquid film temperatures close to the temperature of the heater, and the temperature gradients on its surface decrease sharply. In this region three-dimensional waves merge to the lower part of the heater and the formation of thermocapillary structures in regime B appears with an average rivulet spacing of 15 mm
Summary
Film flows are widely used in various industrial technologies and apparatuses, and understanding the processes occurring in flowing films is an important task for the implementation of such devices. Investigations of the natural evolution of developed three-dimensional waves into thermocapillary-wave rivulets during heating of a vertically falling water film under conditions of small temperature gradients were performed in [6] with Re = 10. It is shown that at the front of the three-dimensional wave, when moving along the heater, temperature inhomogeneities appeared.That led to the deformation of the liquid film and the formation of rivulets due to the action of thermocapillary forces. The aim of this work is an experimental study of the effect of the interaction of hydrodynamic waves with thermocapillary structures on the stability of the flow of a heated water film to rupture
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