Condensation Heat Transfer Coefficient. Not surprisingly this has stimulated research work over the past 60 years with the aim of finding an effective promoter. In figure 4 the results for downward horizontal and upward flow of low pressure steam condensing in 5 15 width depth in line and staggered banks of horizontal plain tubes are plotted on the coordinates of versus f where nu αdλ l re l f α is the mean heat transfer coefficient for a tube row perpendicular to the vapor flow direction is the vapor velocity based on the maximum flow cross.
For instance the heat transfer coefficient for dropwise condensation of steam is around 10 times that for film condensation at power station condenser pressures and more than 20 times that for film condensation at atmospheric pressure. Pdf the heat transfer coefficient of steam condensation has a significant role in the performance of air cooled heat exchangers. Furthermore it was possible to derive a.
Interfacial heat transfer coefficients h i for the direct contact condensation of a vapor on a liquid film of similar chemical composition were measured at various saturation pressures for the following substances.
The heat of condensation diminishes with increasing pressure while the boiling point increases. For organic vapors condensing side heat transfer. Degradation of condensation htc heat transfer coefficient under an air presence in a vertical tube was explored both experimentally and analytically with the aim of developing evaluation methods for the design of passive containment cooling systems in the next generation reactors. Water carbon tetrachloride methanol n pentane methylene chloride freon 113 11 dichloroethane and carbon disulfide.