Derivation and Uncertainty Quantification of a Data-Driven Subcooled Boiling Model

Jerol Soibam, Achref Rabhi, Ioanna Aslanidou, Konstantinos Kyprianidis and Rebei Bel Fdhila
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Jerol Soibam: School of Business, Society and Engineering, Mälardalen University, 72123 Västerås, Sweden
Achref Rabhi: School of Business, Society and Engineering, Mälardalen University, 72123 Västerås, Sweden
Ioanna Aslanidou: School of Business, Society and Engineering, Mälardalen University, 72123 Västerås, Sweden
Konstantinos Kyprianidis: School of Business, Society and Engineering, Mälardalen University, 72123 Västerås, Sweden
Rebei Bel Fdhila: School of Business, Society and Engineering, Mälardalen University, 72123 Västerås, Sweden

Energies, 2020, vol. 13, issue 22, 1-30

Abstract: Subcooled flow boiling occurs in many industrial applications where enormous heat transfer is needed. Boiling is a complex physical process that involves phase change, two-phase flow, and interactions between heated surfaces and fluids. In general, boiling heat transfer is usually predicted by empirical or semiempirical models, which are horizontal to uncertainty. In this work, a data-driven method based on artificial neural networks has been implemented to study the heat transfer behavior of a subcooled boiling model. The proposed method considers the near local flow behavior to predict wall temperature and void fraction of a subcooled minichannel. The input of the network consists of pressure gradients, momentum convection, energy convection, turbulent viscosity, liquid and gas velocities, and surface information. The outputs of the models are based on the quantities of interest in a boiling system wall temperature and void fraction. To train the network, high-fidelity simulations based on the Eulerian two-fluid approach are carried out for varying heat flux and inlet velocity in the minichannel. Two classes of the deep learning model have been investigated for this work. The first one focuses on predicting the deterministic value of the quantities of interest. The second one focuses on predicting the uncertainty present in the deep learning model while estimating the quantities of interest. Deep ensemble and Monte Carlo Dropout methods are close representatives of maximum likelihood and Bayesian inference approach respectively, and they are used to derive the uncertainty present in the model. The results of this study prove that the models used here are capable of predicting the quantities of interest accurately and are capable of estimating the uncertainty present. The models are capable of accurately reproducing the physics on unseen data and show the degree of uncertainty when there is a shift of physics in the boiling regime.

Keywords: computational fluid dynamics (CFD); artificial neural network (ANN); subcooled boiling flows; uncertainty quantification (UQ); Monte Carlo dropout; deep ensemble; deep neural network (DNN) (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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