E3S Web Conf.
Volume 128, 2019XII International Conference on Computational Heat, Mass and Momentum Transfer (ICCHMT 2019)
|Number of page(s)||4|
|Section||Heat and Mass Transfer in Energy Systems|
|Published online||08 November 2019|
The heat transfer and instabilities results during the onset of flow boiling in minichannels
Kielce University of Technology
al. Tysiaclecia Panstwa Polskiego 7,
2 Echo Investment S.A., Al. Solidarnosci 36, 25-323 Kielce, Poland
* Corresponding author: email@example.com
The paper discusses the results of flow boiling heat transfer in minichannels obtained on the basis of time-dependent experiments. The main interest of the work was to investigate the occurrence of the accompanying instabilities during the boiling incipience. The essential part of the experimental standwas a test section with two minichannels, each of 1.7 mm depth. The heated element for FC–72flowing along the minichannels was a thin foil. In the tested minichannel, the temperature of the outer surface of the foil was measured due to thermoelements. The onset of flow boiling in minichannels was induced by increasing the heat flux supplied to the heater. The main aims of the investigation were to determine the heat transfer coefficient by means of the FEM with time—dependent Trefftz–type basis functions based on the Hermite interpolation and to recognize dynamic instabilities during boiling incipience. The results were illustrated as: the heat transfer coefficient, the mass flow rate and the inletpressure versustime and as boiling curves.
© The Authors, published by EDP Sciences, 2019
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