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Download Advances in Heat Transfer, Vol. 20 by James P. Hartnett, Thomas F. Irvine (Eds.) PDF

By James P. Hartnett, Thomas F. Irvine (Eds.)

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13. At an inclination angle of less than 120", the rough surface gives a higher heat-transfer coefficient than the smooth surface, as generally observed in pool boilhg. At an inclination angle of more than 150", however, this is only true in the high heat flux region and there is no difference in heat transfer in the low heat flux region, as would be expected. 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.

Temperature drop with decreasing liquid level is larger for the smoother surface. Since the reverse is true for a rougher heating surface, the difference in the heating surface temperature becomes smaller between the smooth and rough surfaces at the lower liquid level. (4) At a liquid level greater than that for the first appearance of dried area at the bottom of domes, nucleation sites are observed on the surface, and their number is larger for a rougher surface, as in the case of pool boiling.

94). The emission frequency of coalesced bubble N ( l ) included in Eq. (94) was measured for water, sodium oleate aqueous solution, saponin aqueous solution, and ethanol. The data are correlated in terms of heat flux, clearance, and physical properties, as shown in Fig. '/W h. 174 X bubble region in saturated boiling. C. THEORETICAL CONSIDERATIONS The heat-transfer characteristics in the coalesced bubble region are analyzed here on the basis of a simple model. An one-dimensional model is assumed, as illustrated in Fig.

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