Local properties of countercurrent stratified steam-water flow
Thesis/Dissertation
·
OSTI ID:6692579
A study of steam condensation in countercurrent stratified flow of steam and subcooled water has been carried out in a rectangular channel/flat plate geometry over a wide range of inclination angles (4/sup 0/-87/sup 0/) at several aspect ratios. The variables in this experiment were the inlet water and steam flow rates, and the inlet water temperature. Local condensation rates and pressure gradients were measured, and local condensation heat transfer coefficients and interfacial shear stress were calculated. In addition, contact probe traverses of the surface waves were made, which allowed a statistical analysis of the wave properties. The local condensation Nusselt number was correlated in terms of local water and steam Reynolds or Froude numbers, as well as the liquid Prandtl number. In addition, a turbulence-centered model, developed by Theofanous, et al. (1976) principally for gas absorption in several geometries, was modified by using measured interfacial parameters for the turbulent velocity and length scales. A simple correlation for the interfacial shear stress and the pressure gradient was developed and compared with the measured values, resulting in good agreement. The mean water layer thicknesses were calculated by assuming a linear shear stress distribution in the liquid layer, using the von Karman mixing length hypothesis, and then compared with the experimental data. Finally, some characteristic interfacial wave parameters, such as the mean water layer thickness, liquid fraction probability distribution, wave amplitude and wave frequency, are analyzed and discussed.
- OSTI ID:
- 6692579
- Country of Publication:
- United States
- Language:
- English
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