Evaluation of prediction methods for heat transfer coefficient of annular flow and a novel correlation

Yuan, Shuai; Cheng, Wen‐Long; Nian, Yong‐Le; Zhong, Qi; Fan, Yi; Jiang, He

doi:10.1016/j.applthermaleng.2016.11.170

Cited by 5 publications

(6 citation statements)

References 63 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The conclusions drawn on the basis of the results of [43] are substantially strengthened by the results of the studies [44] Really, the results of generalization of the experimental data showed fundamental characters of the MTD-UC and versatility of the UC, which outperformed in accuracy all the competitive equations. However, due to some sad missteps, very important work did not end with the adequate conclusions.…”

Section: Hard Steps To Recognitionmentioning

confidence: 54%

See 1 more Smart Citation

Boiling Heat Transfer: Convection Controlled by Nucleation

Shekriladze¹

2018

Heat Transfer - Models, Methods and Applications

View full text Add to dashboard Cite

Due to the peculiar way of evolution of boiling heat transfer research, a model "theater of director" (MTD), pumping effect of growing bubble (PEGB) and MTD-based universal correlation (UC) remain beyond the attention of researchers for more than half a century.In parallel, there are periodic fundamental events, demonstrating the irrationality of such indifference. Since the 1980s, not having found a way to enhance boiling heat transfer, other than that uncovered by the MTD-UC, high-performance boiling surfaces are being developed by artificially increasing effective radius (ER) of nucleation centers (bypassing the reference to the relevant theoretical basis). In 2009, an independent review declares transient conduction and microconvection as the dominant boiling heat transfer mechanism, not knowing that this is just the PEGB. In 2014-2017, the real versatility and accuracy of the UC is confirmed by independent studies, which involve extensive databases on the pool and flow boiling (with some interpretation problems). Assessing the current status of the study, the chapter emphasizes the complete fiasco of traditionally adopted approaches, models and theories, led to the dominance of purely empirical relationships written in a dimensionless form. Heat transfer research community is invited to gain will and rid of the heavy burden of the past.

show abstract

Section: Hard Steps To Recognitionmentioning

confidence: 54%

“…As a result, the direction still has not reached the level to be taken into account when analyzing the existing experimental data bases [43,44].…”

Section: Heat Transfer -Models Methods and Applicationsmentioning

confidence: 99%

Boiling Heat Transfer: Convection Controlled by Nucleation

Shekriladze¹

2018

Heat Transfer - Models, Methods and Applications

View full text Add to dashboard Cite

show abstract

“…As shown in Fig.4, this correlation provides very good predictions against the entire database, with 89.45% of the data falling within ±30% error bands. Our previous research [27] showed that the prediction accuracy of this general correlation is much higher than the other top 5 prediction methods and got better consistency with the varying vapor quality. Due to its acceptable accuracy of prediction, this general correlation is adopted in this paper to predict the heat transfer coefficient of smooth tube.…”

Section: General Correlation Of Smooth Tube For Comparisonmentioning

confidence: 72%

“…In order to evaluate the heat transfer enhancement effect of "Ω"-shaped grooves, a comparison between the experimental data and our previously proposed correlation for smooth tube [27]…”

Section: General Correlation Of Smooth Tube For Comparisonmentioning

confidence: 99%

Experimental study on heat transfer characteristics of R134a flow boiling in “Ω”-shaped grooved tube with different flow directions

Cheng

Chen

Yuan

et al. 2017

International Journal of Heat and Mass Transfer

Self Cite

View full text Add to dashboard Cite

To study the heat transfer enhancement of flow boiling in "Ω"-shaped grooved tube, an experimental investigation with refrigerant R134a as working fluid was conducted. The experiments were performed at different flow directions with mass flux of 10-30kg/(m 2 •s) and heat flux of 3-10kW/m 2 , respectively. The effects of vapor quality, heat flux and mass flux in horizontal, upward and downward flow were compared and analyzed. The comparative study with smooth tube showed significant enhancement of 1.5-3.3 times on heat transfer coefficient in horizontal and upward flow. Contrary to smooth tube results, heat transfer coefficient of downward flow is much higher than horizontal flow. The comparative study between different flow directions showed that heat transfer coefficient decreased with increasing vapor quality in horizontal and downward flow, however in upward flow, it was almost constant. In horizontal and upward flow, heat flux showed a strong positive effect and the effect of mass flux was not very sensitive; however in downward flow, heat flux showed a negative effect and mass flux showed a stronger positive effect. It is concluded that the effect mechanism of gravity on heat transfer in "Ω"-shaped grooved tube is quite different from smooth tube and heat transfer enhancement caused by "Ω"-shaped grooves is not only because of the increase in inner surface area. What's more, heat transfer is dominated by nucleate boiling in horizontal and upward flow, while in downward flow, convective boiling comes to dominate.

show abstract

“…Liu and Winterton [39] were early adopters of an asymptotic approach using similar multipliers to Gungor and Winterton [38], whilst Steiner and Taborek [40] developed an asymptotic model for boiling in vertical tubes based on experimental data for a range of fluids. Some models have been developed for annular flow specifically [41,42], and Guo et al [43] modified the Liu and Winterton [39] correlation for boiling flows of R245fa and an R134a/R245fa mixture in smooth horizontal tubes of 3 mm inside diameter.…”

mentioning

confidence: 99%