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Numerical and experimental research on natural convection condensation heat transfer

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Abstract

Natural convection condensation, with the advantage of high reliability and not requiring complex mechanical drive structures, is broadly used in industrial fields, such as chemical, nuclear power, automotive, etc. This work aims to investigate the heat transfer mechanism and evaluate the performance of natural convection condensation with the artificial neural network (ANN) method, correlation predictions, and the code based on the boundary theory. An empirical correlation was proposed based on the present experimental data with operating conditions in the pressure range of 0.2 MPa -0.6 MPa, subcooled temperature range of 11 K–45 K, and air mass fraction range of 0.0049–0.69. The empirical correlation was validated against a consolidated database, with 91% of the data reproduction falling within the error band of \(\pm\) 30%. An ANN model was put forward with training, validation, and testing using the present experimental data, which yields an error of \(\pm\) 5% in the present test data. When the trained model was utilized to reproduce the additional database, all the data fell within an \(\pm\) 11% error band. Finally, a side-by-side comparison in heat transfer coefficient reproduction was conducted among those rapidly computational methods, and the ANN model turned out to have the best performance.

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Abbreviations

A :

Surface [m2]

d :

Diameter [m]

D :

Diffusion coefficient [m2·s1]

h :

Heat Transfer Coefficient [Wm2·K1]

\({{h}}_{{fg}}\)  :

Latent Heat [kJ·kg1]

l :

Length [m]

m :

Mass [kg]

\(\stackrel{\cdot }{{{m}}}\)  :

Condensate mass flux [kg·s1]

M :

Molar mass [g·mol1]

P :

Pressure [Pa]

R 2 :

Determination coefficient

T :

Temperature [K]

W :

Mass Fraction [-]

ANN:

Artificial neural networks

MAE:

Mean Absolute Error

MPAE:

Mean absolute percentage error

MSE:

Mean Square Error

RMSE:

Root mean square error

\(\rho\)  :

Density [kg·m3]

\(\varphi\)  :

Ratio [-]

\(\mu\)  :

Dynamic viscosity [Pa·s]

air :

Air

b :

Bulk

c on :

Condensate

c o :

Cooling Water

e xp :

Experiment

f :

Flow

i :

Counting variable

in :

Inlet

m :

Mass

o ut :

Outlet

s :

Steam

w :

Wall

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Funding

This work is funded by the Guangdong Basic and Applied Basic Research Foundation (Grant No. 2021A1515110604, 2022A1515012075), China Postdoctoral Science Foundation (Grant No. 2021M691058).

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Authors and Affiliations

Authors

Contributions

Bing Tan: Wrote the main manuscript text Jiejin Cai: Conceptualization, Investigation, Supervision, review & editing.

Corresponding author

Correspondence to Jiejin Cai.

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The authors declare no competing interests.

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Appendix

Appendix

A generalized correlation was put forward by Dehbi [6], as Eq. (13), this correlation is highly recognized and widely cited, such as in the work of Swartz and Yao [7], Hwang and Jerng [17] and Park et al. [18], etc. The previously mentioned database is used to validate, as well, the error of the reproduction is shown in Fig. 14.

Fig. 14
figure 14

Reproduce the database by Dehbi’s generalized correlation

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Tan, B., Cai, J. Numerical and experimental research on natural convection condensation heat transfer. Heat Mass Transfer 60, 751–764 (2024). https://doi.org/10.1007/s00231-024-03468-x

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