Abstract
Natural-convection film-boiling heat transfer from horizontal cylinders in the middle-and small-diameter regions is investigated analytically and experimentally. Film-boiling experiments were conducted for water and R113 at atmospheric pressure. The results obtained are summarized as follows. Liquid flow around the vapor film is induced mainly by shear force at the liquid-vapor interface except in the low-pressure region. For film-boiling heat transfer in the small diameter region, both the effect of vapor units lined up along the cylinder axis and the failure of the boundary layer approximation should be taken into account, and subcooling dependence in this region is similar to that in the middle-diameter region. In the case of a cylinder with very small diameter, as liquid subcooling increases, the film-boiling heat transfer coefficient decreases down to a minimum and then increases.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
