By James P. Hartnett, Thomas F. Irvine (Eds.)
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Extra info for Advances in Heat Transfer, Vol. 20
Figures 17a and 17b show the heat-transfer coefficients aIand a, during the liquid and vapor periods. As evident from FIG. 17. Results of calculation based on a proposed model for boiling heat transfer from the surfaces with various inclination angles. (a) Heat-transfer coefficient E l , (b) m V , (c) relative contribution of latent-heat transport, and (d) calculated time-averaged heat flux qc . 36 KANEYASU NISHIKAWA AND YASUNOBA FUJITA Fig. 17, an inclination angle has a large effect on a”, while aI is rather insensitive to the variation of an inclination angle.
C . 4 ... 28. Relationship between the heat-transfer coefficient and pressure at constant clearance of boiling space and at constant heat flux. is reduced across another certain value, on the contrary, the liquid deficient region takes place for the coalesced bubble region, and the heattransfer coefficient falls rapidly for further reduction of pressure. To distinguish the three regions more distinctively, the boiling-region diagram is drawn for water in Fig. 29. Boiling region diagram for the boiling of distilled water in narrow space (See Table W.
29 NUCLEATE BOILING HEATTRANSFER '1; rj - I 1 1 , , ,, - w=120' 106- - -- - SURFACE 0 : ROUGH S U R F A C E -- - -2 N E :SMOOTH 3 8 lo5- b Q a AT ( K ) C AT (K) 10'~ 10 d AT ( K ) 30 FIG. 13. Effect of surface roughness on heat transfer in nucleate boiling from the surfaces with various inclination angles. 1. Sensible-Heat Transport After the superheated liquid layer has been completely swept away by the preceding bubble, the bulk liquid of saturation temperature T,,, comes in contact with the heating surface at constant temperature T,.