Cukrov, A.; Sato, Y.; Boras, I.; Ničeno, B. Film Boiling around a Finite Size Cylindrical Specimen—A Transient Conjugate Heat Transfer Approach. Appl. Sci.2023, 13, 9144.
Cukrov, A.; Sato, Y.; Boras, I.; Ničeno, B. Film Boiling around a Finite Size Cylindrical Specimen—A Transient Conjugate Heat Transfer Approach. Appl. Sci. 2023, 13, 9144.
Cukrov, A.; Sato, Y.; Boras, I.; Ničeno, B. Film Boiling around a Finite Size Cylindrical Specimen—A Transient Conjugate Heat Transfer Approach. Appl. Sci.2023, 13, 9144.
Cukrov, A.; Sato, Y.; Boras, I.; Ničeno, B. Film Boiling around a Finite Size Cylindrical Specimen—A Transient Conjugate Heat Transfer Approach. Appl. Sci. 2023, 13, 9144.
Abstract
The DNS of film boiling requires strong computational resources that are difficult to obtain for a daily CFD use by the practitioners of the industrial R&D experts. On the other hand, the film boiling experiments are associated with the usage of the expensive and highly sophisticated apparatus, and the research to this end is found to be relatively difficult due to high heat flow rates that are present in the process itself. When combined with a transient heat conduction in a solid, the problem becomes significantly difficult. Therefore, a novel method in computation of conjugate heat transfer during film boiling in a quiescent liquid has been proposed in this paper. The method relies on the solution of mass, momentum and energy conservation equations in a two-fluid framework, supplemented with the appropriate closures. Furthermore, the turbulent flow has been found as an important parameter in obtaining the accurate solution of the temperature field evolution in a solid specimen, via the proper modeling of turbulent kinetic energy (TKE) value, that has been imposed as a constant value, i.e., the frozen turbulence approach. It was found, in addition, that the appropriate TKE value can be obtained by use of Kelvin-Helmholtz instability theory in conjunction with the boundary layer theory. The obtained results show excellent agreement with the experimental data within the first 15 s of the experiment, i.e., the first ca. 10 % of the total duration of the film boiling mode of heat transfer. Furthermore, the heat transfer coefficient has matched the error bands prescribed by the authors of the paper that has presented the correlations, whilst the averaged values are far beyond this band, i.e., are slightly more than 30 % higher. The further inspection has revealed a measure of similarity between the computational result of the volume fraction field distribution and the experiment, thus confirming the capability of the method to obtain realistic interface evolution in time. The method has shown full capability for further pursuing the industrial-scale film boiling problems that involve turbulent flow and the conjugate heat transfer approach.
Keywords
low Biot number material; conjugate heat transfer; film boiling; large-scale domain; turbulent flow; Kelvin-Helmholtz instability; frozen turbulence approach
Subject
Engineering, Mechanical Engineering
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
