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

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

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Extra resources for Advances in Heat Transfer, Vol. 20

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This -. 15ppm sodium oleole solution distilled water '8 \ @\ --Coalesced. 24. Variation of heat-transfer coefficient due to change in clearance of boiling space (atmospheric pressure, constant heat flux). Data for a vertical copper cylinder with 80-mm diameter and 304-mm height are shown for, distilled water (0)and 15 ppm sodium oleate aqueous solution (0)(from Ishibashi and Nishikawa [57]). 5-mm diameter and 479-mm height are shown for distilled water ( 0 )(from Chernobyl'skii and Tananaiko [58]).

Brass, 9 = 26 - 65 kW/m2. Run No. 11: copper, 9 = 19 - 606 kW/m2 Run No 111-1. brass, q = 13 40 kW/m2. Run No. 111-2: copperiq = 15 - 242 kW/m2. Symbol 4indicates that the heating surface was a circular plate. Figure 35 compares correlations (104) and (105) with the experimental data for distilled water and ethanol at the liquid level of less than 10 mm on the horizontal circular heating surfaces of 140 and 41 mm in diameter [59]. The curve representing the data changes its slope at Xz= 2, becoming gentle for Xz < 2.

97 mm. The same dependency of Nc1)on q , as given by Eq. (89), is also found for ethanol, provided that the heat flux is less than a certain level. For heat flux beyond this level, however, the emission frequency is reduced far below that estimated by Eq. (89), and the heat-transfer coefficient depends on heat flux to a smaller degree compared with that estimated by Eq. '2 (91) Since the phenomena in this situation can easily shift into the burnout, this region governed by Eq. (91) is named the preburnout region.

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