Condensation heat transfer on a rotating cylinder
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"The mechanism of the vapor condensation on a cold surface was first mathematically formulated by Nusselt in 1916. Though many modifications of Nusselt's formulation have been introduced by other scientists later (see PREVIOUS WORK), his basic principle "The thermal resistance of the vapor condensation is on the condensate film" remains unchanged. When the condensation occurs naturally, the condensate is removed from the cold surface by gravitational flow alone. Since the gravitational force is invariant, some methods of removal of the condensate have to be appli ed in order to increase the condens ation rate beyond the natural occurance. There are four techniques as follows: 1. Mechanically removing the condensate by scraping or other techniques. 2. Imparting a large velocity of the vapor tangential to the surface to blow off the condensate. 3. Applying a high electrical potential to the condensate to pull off the condensate if the condensate is adielectric fluid. 4. Rotating the condenser surface to throw off the liquid by centrifugal force. The pioneer studies of the last method of condensate removal from tube have been done by Yamanaka, Birt et. al. and Yeh, Yamanaka studied condensation on a horizontal tube revolving about an axis parallel to the tube axis) Birt investigated condensation on a vertical tube rotating about its axis, and Yeh investigated condensation on a horizontal tube about its axis. Both Birt and Yeh's works were considered as developmental studies by Singer who tried an experimental verification of the mathematical model of condensate film behavior. In Singer's experimental investigation he did not obtain the data of the condensate film behavior directly from the experimental results, but from indirect calculation by means of Kuo's correlation for the inside film coefficient. Therefore, his results of the steam side film coefficient have been seriously affected by the improper use of Kuo's correlation, and it is still necessary to explore the behavior of the condensate film. In space, natural condensation becomes impossible due to the non-existance of gravity, hence centrifugal force may replace gravity. The practical aspects of this study may eventually be found in space science applications. Recently, vapor condensation in a turbo engine attracts the attention of many engineers. Condensation in a rotational system will probably become the key to the development of the antipollution engine in the near future."--Introduction.
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