Nucleate boiling correlations

Figure 10-100. Maximum AT for nucleate boiling correlation. (Used by permission Cichelli, M. T, and Bonilla, C. F. Transactions, AlChE, V. 41, No. 6, 1945. American Institute of Chemical Engineers. All rights reserved.)...

Either the nucleate-boiling correlation given by Equations (6.92a) and (6.92b) or the extended methods given in the literature [34, 47] can be used for The two-phase convective coefficient is related to the single-phase liquid coefficient heo by... 

Kettle reboilers generate vapor for process purposes by boiling the liquid outside a bundle of horizontal tubes. This process was historically considered to be an example of pool boiling, with the coefficient calculated by a typical nucleate boiling correlation and a maximum heat flux either fixed by experience [48] or by some modification of Equation (6.94) reflecting the size of the tube bundle [49, 50]. 

An important class of nucleate boiling correlations are those where the reduced pressure P, is used as a correlating parameter. This avoids the need for extensive physical property data, and, it can be argued, the fundamental inaccuracy of boiling correlations hardly justifies anything more complex. An early correlation of this type was that of Mostinskii [109], which is in the form... 

TABLE 18.5 Fully Developed Nucleate Boiling Correlation q mtt (W/m2) = CA7sa, (°C)"] for Water... 

The mathematical formulation of forced convection heat transfer from fuel rods is well described in the Hterature. Notable are the Dittus-Boelter correlation (26,31) for pressurized water reactors (PWRs) and gases, and the Jens-Lottes correlation (32) for boiling water reactors (BWRs) in nucleate boiling. 

Pool and Nucleate Boiling—General Correlation for Heat Flux and Critical Temperature Difference... 

The mechanism of boiling is essentially nucleate pool hoiling. In hoth styles of rehoiler the liquid velocity is relatively low compared to thermosiphon units. Jacobs provides an extensive comparison of advantages and disadvantages of essentially all the reboiler types used in industrial plants. Palen and Taborek conducted extensive studies of available data and proposed nucleate boiling equations to correlate various data from the available 14 equations down to a selected 6 for detailed study. The study was limited to various hydrocarbons and hydrocarbon mixtures. Their conclusions after computer correlations of the results from several equations were as follows. 

Above critical temperature difference for nucleate boiling Vs -in-Vs -in- O.D. (data of correlation)... 

Griffith, P, The Correlating of Nucleate Boiling Burnout Data, ASME Heat Transfer Div. meeting. University Park, PA, Aug. 11 (1957) Paper 57-HT-21. 

G5. Griffith, P., The correlation of nucleate boiling burnout data, ASME Paper No. 57-HT-2I (April 1957). 

Hsu YY, Graham RW (1961) An analytical and experimental study of the thermal boundary layer and ebullition cycle in nucleate boiling. NASA TN D-594 Hwan YW, Kim MS (2006) The pressure drop in micro-tubes and correlation development. Int J Heat Mass Transfer 49 1804-1812... 

In the nucleate boiling region the heat-transfer coefficient is dependent on the nature and condition of the heat-transfer surface, and it is not possible to present a universal correlation that will give accurate predictions for all systems. Palen and Taborek (1962) have reviewed the published correlations and compared their suitability for use in reboiler design. 

The nucleate boiling coefficient can be calculated using correlations for nucleate pool boiling modified by a factor fs to account for the fact that nucleate boiling is more difficult in a flowing liquid. 

Correlation of Nucleate Boiling Data 2.4.2.1 Nucleate pool boiling of ordinary liquids. 

The boiling number, Bo, Eq. (2-79) was used to represent the nucleate boiling term. Thus Kandlikar s correlation for vertical flow is expressed as... 

Clinch, J. M., andH. B. Karplus, 1964, An Analytical Study of the Propagation of Pressure Waves in Liquid Hydrogen-Vapor Mixtures, Report IITRI-N-6054-6, IIT Research Inst., NASA-CR-54015. (3) Cobb, C. B., and E. L. Park, Jr., 1969, Nucleate Boiling—A Maximum Heat Flux Correlation for Corresponding States Liquids, Chem. Eng. Prog. Symp. Ser. 65(92) 188—193. (4)... 

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