By L S Tong
This can be a first-class publication to have for an engineer who care for two-phase flows and warmth move, if you layout and function nuclear reactors, thermal strength crops and different thermal administration platforms. It presents a beginning, with an in depth number of empirical formulae which can be worthwhile if appropriately utilized. What feels lacking during this publication, - and is normal characteristic of BOOKS on two-phase flows and boiling - is the heavy empiricism, the inability of a systematic thought, the absence of sturdy theoretical therapy that one should still own after analyzing any such complete compilation. that's to assert, it truly is sturdy for a few person who is aware the subject/field, no longer for instructing a person approximately boiling warmth move and two-phase flows.
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Extra info for Boiling heat transfer and two-phase flow
2-3), the bubble will grow because of the excess vapor pressure that is no longer balanced by the surface tension forces. During the initial stage of growth, the inertia of the surrounding liquid and the surface tension forces control the process. Considering a single spherical bubble in an incompress ible inviscous liquid of infinite extent (a homogeneous medium), the equation of motion for the spherically symmetrical domain of the liquid is ( � au gc at + u ua ar J = _ ap ar (2 -25) where u is the radial liquid velocity.
The method of Theofanous et al. ( 1 969) should be the most accurate for pre dicting bubble growth rates in large volumes of liquid metals at uniform super heats, although there has been no experimental data against which to test it di rectly. A number of investigators have studied the problem of isobaric bubble growth in an initially nonuniformly superheated liquid, such as occurs when a bubble grows in a thin superheated liquid layer on a heater surface. 1 1 8, sec Comparison of calculated growth rates for a spherical bubble i n a uniformly heated, large volume of superheated sodium.
The controlling phenomena for the collapse process are much the same as for the growth process but are encountered in reverse order. 2. 1 Nucleation The primary requirement for nucleation to occur or for a nucleus to subsist in a liquid is that the liquid be superheated. There are two types of nuclei. One type is formed in a pure liquid; it can be either a high-energy molecular group, resulting from thermal fluctuations of liquid molecules; or a cavity, resulting from a local pressure reduction such as occurs in accelerated flow.