By James P. Hartnett, Thomas F. Irvine (Eds.)
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Additional resources for Advances in Heat Transfer, Vol. 20
Relationship among coalesced bubble emission frequency, heat flux, and clearance of boiling space. 64 0 0. 26. Relationship between coalesced bubble emission frequency and heat flux for boiling in narrow space. 97 mm. ), ( x ) , ethanol. All liquids are at stp. heat-transfer coefficient in the preburnout region was found to be correlated in terms of the emission frequency of coalesced bubbles in the same manner as that for the coalesced bubble region. This means that the emission frequency of the coalesced bubble also controls the mechanism of the boiling heat transfer in the preburnout region.
Figure 20a shows the behavior just after the bubble generation. Liquid at the upper part of a vapor bubble is displaced upwards by the expanding bubble and the vapor-liquid interface forms a shape just like a crater. At the lower part, the interface is smooth because the buoyancy force is balanced with the expansion force. A thin liquid film can also be observed on the surface covered by the bubble. 19. Boiling behavior in narrow spaces (at atmospheric pressure, within a coalesced bubble region).
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. 21. Photographs of the heating surface at -;he liquid deficient region for boiling in narrow space. 6 K. 4 MPa, coalesced bubbles are also generated steadily at a low frequency and a thin liquid film can be observed on the surface covered by the coalesced bubbles.