Boiling dynamics in parallel minichannel system with different inlet solutions

Zaborowska, Iwona; Grzybowski, Hubert; Rafałko, Gabriela; Mosdorf, Romuald

doi:10.1016/j.ijheatmasstransfer.2020.120655

Cited by 5 publications

(1 citation statement)

References 27 publications

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“…Among the many papers that have recently focused on heat transfer that are available in the literature, the results are based only on numerical simulations, for example, using the Laplace transform (as in [16]) or the Galerkin method (as in [17]). It should be emphasized that in this work, as well as in articles by other authors, such as [8,[18][19][20], the results of the numerical calculations were based on their own experimental research.…”

Section: Introductionmentioning

confidence: 95%

Heat Transfer Calculations during Flow in Mini-Channels with Estimation of Temperature Uncertainty Measurements

Piasecka

Maciejewska

Piasecki³

2023

Energies

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The main aim of this work was to provide heat transfer calculations of flow boiling in mini-channels with an application for the Trefftz functions. The test section comprised five parallel mini-channels with a depth of 1 mm, with a common heated wall. For the estimation of the temperature uncertainty, during the experiment the temperature measurement was performed with the use of K-type thermoelements and an infrared camera in two mini-channels simultaneously. According to the Guide to the Expression of Uncertainty in Measurement, the Monte Carlo method is a practical alternative to the GUM uncertainty framework. Since the uncertainty components are not approximately the same magnitude, the Monte Carlo method was indicated to estimate the uncertainty of the surface temperature measurement. The results obtained from this simulation method were compared with the results of the computation related to the uncertainty propagation method. The results of both methods of temperature measurement were found to be consistent. The results of the statistical analysis were used to describe heat transfer calculations. The heat transfer investigations concerning the subcooled boiling region were performed during the other experiment. The local heat transfer coefficients on the contact surface between the working fluid and the heated wall were calculated from the Robin boundary condition. The mathematical model described by the heat equation in the mini-channel wall and by the Fourier-Kirchhoff equation in a flowing fluid leads to an inverse heat transfer problem. This problem was solved using the FEM with the Trefftz-type basis functions. The estimation of temperature uncertainty measurements due to the Monte Carlo method was included in the final results of the heat transfer coefficient.

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