NEW RESULTS OF INVESTIGATION OF HEAT EXCHANGE DURING BOILING IN TUBES,
LIBRARY OF CONGRESS WASHINGTON D C AEROSPACE INFORMATION DIV
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Heat exchange during surface boiling in a steam generator tube was investigated. Calculation of heat exchange intensity along the length of the tube followed 2 formulas. Up to the section at which the steam temperature became equal to the temperature at which intensive boiling set in, the heat transfer coefficient was determined from the formula of convective heat exchange in a single-phase medium. Beyond that section a second formula was used. The heat transfer coefficient over the entire length was then determined from the first formula. Change in flow temperature along tube length was also taken into account. In addition, the stream temperature at which surface heating began was calculated in order to establish a limit to the applicability of the preceding formulas.