Action of low and high gravity levels on cryogenic cooling with boiling of electronics

摘要

The report presents the fullest theoretical solution of a problem of heat and mass transfer at boiling. Known empirical formulae for heat flow by different authors are gotten from this solution as special case. Comparison of particular experiments with the calculations by the given the dependence coincide satisfactorily. The obtained analytical relations let estimate influencing a gravitational field j = j/g on the internal characteristics of boiling. The gravitation influences on growth rate of a steam bubbles includes the range j~0- j~(-1/3), on the departure bubbles includes the range j~(-1/3) - j~(1/2), on frequency of bubbles withdrawal include the range j~0- j~(2/3) - j~1 , on the density of active nucleation sites j~(1/4) - j~(1/6), on the overheat at boiling j~(-1/4), on heat flux j~(1/3) - j~(-1/12) - j~(-1/3) , on the hear transfer coefficient includes the range j~(-1/12).