By James P. Hartnett, Thomas F. Irvine (Eds.)
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Extra info for Advances in Heat Transfer, Vol. 20
These results seem to support the previously mentioned idea concerning the mechanisms in nucleate boiling from the inclined surface. C. HEAT-TRANSFER MODELFOR THE SURFACEFACINGDOWNWARD In the low heat flux region, the heat transfer from the surface facing downward is assumed to occur by two mechanisms of sensible-heat transport and latent-heat transport. In the subsequent analysis a rising elongated bubble is assumed to carry away the superheated liquid layer in front of it. The sensible heat removed in this manner is evaluated based on the transient-heat conduction from the heating surface to the liquid during the liquid period t, , that is, the time interval during which the heating surface contacts with the bulk liquid.
5 mm on an average at the center of the heating surface. Figure 18 shows the typical behaviors of bubble generation in the isolated bubble region. When the clearance was reduced to less than 3 mm, isolated bubbles were no longer observed. The space filled with large coalesced bubbles, as seen in Fig. 19, and the behavior was quite different from that of the isolated bubble region, shown by Fig. 18. 97 mm, for example, one of these coalesced bubbles extended instantaneously to a height of -30 mm and momentarily covered the whole heating surface.
Then, as the time proceeds the portion occupied by vapor bubbles gradually becomes enlarged and, as a result, the ring-shaped liquid band between the successive coalesced bubble becomes narrower. And finally this liquid band collapses into the considerable number of small droplets. Then the droplets adhere to both insides of the annular space and there start to evaporate. At last they are out of sight due to complete evaporation. The region where this dryout phenomena take place on the heating surface in this manner is presently called the liquid deficient region.