An Empirical Modification of Nucleation Theory and Its Application to Boiling Heat Transfer Page: 16 of 38
This report is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided to Digital Library by the UNT Libraries Government Documents Department.
The following text was automatically extracted from the image on this page using optical character recognition software:
Fig. 2. Coordinate System
The essential boundary conditions are those at the wall and at the
moving interface between the bubble and the liquid. The boundary condi-
tion for the temperature at the bubble liquid interface can be obtained by
assuming that the temperature inside the bubble is constant. Then, when
the interface moves a distance 5E, a quantity of heat pvX b per unit area
of the interface is required in the formation of vapor. This quantity must
be equal to the heat transferred from the liquid at the interface.
-k(1 + = pv ,r ,0 = 0
r = R - a - jr , T + nTZ > t > n TZ (11)
n = 1, 2, 3,....
r=r* at t = 0 . (12)
Since it is of interest only to find additional parameters, the condi-
tion at the vapor-liquid interface can be found from equations derived from
motions in a potential field. Plesset and Zwick(19) and Forster and
Zuber(20) have shown that in a superheated liquid the bubble growth rate,
including the effect of heat diffusion across the bubble wall, exhibits the
p/ " - +r r p - , a(13)
and for larger values of time
pc 1 p
r~p s (2t)2 (i 4)
Here’s what’s next.
This report can be searched. Note: Results may vary based on the legibility of text within the document.
Tools / Downloads
Get a copy of this page or view the extracted text.
Citing and Sharing
Basic information for referencing this web page. We also provide extended guidance on usage rights, references, copying or embedding.
Reference the current page of this Report.
Chang, Y. P. An Empirical Modification of Nucleation Theory and Its Application to Boiling Heat Transfer, report, February 1, 1961; United States. (https://digital.library.unt.edu/ark:/67531/metadc863296/m1/16/: accessed May 19, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.