By L S Tong
It is a first-class publication to have for an engineer who take care of two-phase flows and warmth move, in case you layout and function nuclear reactors, thermal strength crops and different thermal administration platforms. It presents a beginning, with an intensive number of empirical formulae which may be necessary if adequately utilized. What feels lacking during this ebook, - and is common 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 examining the sort of accomplished compilation. that's to claim, it's sturdy for a few person who understands the subject/field, now not for educating anyone approximately boiling warmth move and two-phase flows.
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Extra resources for Boiling heat transfer and two-phase flow
In the range B-C, the liquid near the wall is superheated and tends to evaporate, forming bubbles wherever there are nucleation sites such as tiny pits or scratches on the surface. The bubbles transport the latent heat of the phase change and also increase the convective heat transfer by agitating the liquid near the heating sur face. The mechanism in this range is called nucleate boiling and is characterized by a very high heat transfer rate for only a small temperature difference. There are two subregimes in nucleate boiling: local boiling and bulk boiling.
In the past, the terminology of the boiling crisis was not universal. The pool boiling crisis with constant heat flux supply, or crisis occurring in- an annular flow is sometimes called burnout, and that occurring in bubbly flow is sometimes called departure from nucleate boiling (DNB). In this book, all three terms are used interchangeably. In the range C-D, immediately after the critical heat flux has been reached, boiling becomes unstable and the mechanism is then called partial film boiling or transition boiling.
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. The other type, formed on a foreign object, can be either a cavity on the heating wall or suspended foreign material with a nonwetted surface.