Numerical simulation of flow boiling in an orthogonally rotating duct

Numerical predictions of flow boiling in a square tube rotating in vertical direction at a uniform rotating speed are presented. There-dimensional physical model and numerical model were established for simplified problem. Realizable k − ε (RKE) turbulent model was employed to study vapor–liquid two...

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Bibliographic Details
Published in:Journal of thermal analysis and calorimetry 2020-07, Vol.141 (1), p.5-14
Main Authors: Wu, Mingting, Gao, Nanjing, Chen, Guolong, Cui, Xuehang, Li, Hongwei, Huang, Na, Wang, Yanhong, Miao, Runhan, Dong, Yiliang
Format: Article
Language:English
Subjects:
Analysis
Analytical Chemistry
Chemistry
Chemistry and Materials Science
Computational fluid dynamics
Computer simulation
Flow stability
Fluid flow
Heat transfer
Inorganic Chemistry
Mass transfer
Mathematical models
Measurement Science and Instrumentation
Multiphase flow
Nucleate boiling
Numerical analysis
Numerical models
Numerical prediction
Physical Chemistry
Polymer Sciences
Rotation
Turbulent flow
Two phase flow
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Summary:Numerical predictions of flow boiling in a square tube rotating in vertical direction at a uniform rotating speed are presented. There-dimensional physical model and numerical model were established for simplified problem. Realizable k − ε (RKE) turbulent model was employed to study vapor–liquid two-phase turbulent flow. Heat and mass transfer between vapor and liquid were solved based on volume of fluid multiphase flow model combined with user-defined function. The transient results show that wall superheat at onset of nucleate boiling (ONB) condition in rotating tube is obviously higher than that in stable tube. Based on Jens–Lottes formula of Bowring model, empirical formulas for wall superheat at ONB condition were modified with consideration of Rossby number. As the rotation speed increased, location of ONB shifts to the tube exit. Flow pattern in tube is determined by coupling effect of heating and rotation. Stability of flow pattern is gradually weakened during the increase in rotation speed. The numerical results are in fair agreement with two sets of experimental data for same physical model and working conditions.
ISSN:1388-6150
1588-2926
DOI:10.1007/s10973-019-08815-3