Graphical Estimation of Nucleate Boiling Heat Transfer

Abstract

A method for graphically presenting fully developed nucleate boiling heat transfer correlations currently being used for design purposes enables the engineer to compute a numerical value of the boiling heat flux, or corresponding wall superheat, rapidly and without knowledge of the physical properties of the fluid, other than at one arbitrary reference state. ACONVENIENT method is illustrated for presenting boiling heat transfer correlations in engineering handbooks or design manuals. This method is applicable to such correlations as those given by Engelberg-Forster and Grief (7), Rohsenow (3), and Seader, Miller, and Kalvinskas ( 4 ) . If the ratio of the functions f(q/A,AT,) and f(q/A,ATJref, which are determined from the chosen boiling correlation, are plotted against reduced pressure, it forms a single curve for a number of different fluids. The method is, thus, analogous to the law of corresponding states and is demonstrated here with the Engleberg-Forster and Grief correlation, for which j ( q / A,AT,) becomes A T s / a . A curve of ( A T , / d G ) / ( A T , /

Study on onset of nucleate boiling with screw tube for fusion reactor application

“…developed for channels with diameters in the millimeter range, they produce lower error rates than the Hsu or [39] q ONB = 1082p [40] q ONB = k f 4B ( Tw−T sat Pr f…”

“…Qi et al [36] q ONB = 1 064ΔT sat ΔT sat = 22.65(q ONB ) 0.5 e (−P/87) 58.89 89.54 109.00 Jens-Lottes [44] ΔT sat = 25(q ONB ) 0.25 e (−P/62) 218.58 258.78 335.70 McAdams et al [45] q ONB = 4.77ΔT sat [49] ΔT sat = 25.72q 1/3 e (−P/8.6) 108.46 152.37 189.54 zhu et al [50] ΔT sat = 32(q ONB ) 0.16 e (−P/86) 94.33 163.27 210.61 Hata and Masuzaki [51] q ONB = 4.63 × 10 −4 • ΔT sat 3 49.79 100.81 120.91 Yin [52] ΔT sat = 7.195p mini-micro channel correlations. We selected the Bergles and Rohsenow [39], Frost and Dzakowic [40], Celata et al [41], and Basu correlations [42] as evaluation targets for this commonly used type of ONB correlation. The prediction performance evaluation results are shown in figure 17; as Frost and Dzakowic [40] produced significantly higher error rates than the other correlations, it was excluded from the figure (its accuracy results are listed in table 3).…”

“…We selected the Bergles and Rohsenow [39], Frost and Dzakowic [40], Celata et al [41], and Basu correlations [42] as evaluation targets for this commonly used type of ONB correlation. The prediction performance evaluation results are shown in figure 17; as Frost and Dzakowic [40] produced significantly higher error rates than the other correlations, it was excluded from the figure (its accuracy results are listed in table 3). The Bergles and Rohsenow correlation, which is widely used because it demonstrates high ONB prediction accuracy under subcooled flow boiling conditions, tends to under-predict our experimental values, which can be attributed to the fact that it is based on a plain tube rather than a screw tube.…”

Predicting the onset of nucleate boiling heat flux of one-side heated flat heat sink in sub-cooled flow conditions for fusion divertor cooling

“…It can be seen that more data are distributed on the y=x line. The evaluated conventional-sized channel-type correlations include the Bergles and Rohsenow correlation [40], Frost and Dzakowic correlation [41], Celata correlation [42], and Basu correlation [43]. However, in most cases, the effects of the flow rate and subcooling were not effectively reflected in this type of correlation despite being developed under subcooled flow conditions.…”

Inferential framework for two-fluid model of cryogenic chilldown

“…The correlations for onset of nucleate boiling are based on the analysis of the balance between mechanical and thermodynamical equilibrium [9]. Using this analysis the T onb and the corresponding heat flux qonb can be written in the form [79][80][81]…”