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CFD based mini- vs. micro-system delineation in elongated bubble flow regimeRek, Zlatko ; Žun, IztokDelineation of mini and micro scale channels with respect to two-phase flow has been the subject of many research papers. There is no consensus on when the small channel can be characterized as a ... mini channel or micro channel. The idea proposed by this paper is to use the normalized bubble nose radius, liquid film thickness top over bottom ratio, and bubble shape contour, which are found under normal gravity conditions in slug flow through a horizontal adiabatic channel, as the delineation criteria. The input parameters are bubble nose radius and bubble nose velocity as the characteristic length scale and characteristic velocity scale respectively. 3D numerical simulation with ANSYS FLUENT was used to obtain the necessary data. Following CFD practice, a mesh independence study and a numerical model validation against published experimental data were both conducted. Analysis of the numerical simulation results showed that channels with D 100 um can be characterized as a micro system, while channels with D 400 um belong to mini systems. The region 200 um D 300 um represents a transition from the micro scale to mini scale.Source: International journal of multiphase flow. - ISSN 0301-9322 (Vol. 59, Feb. 2014, str. 73-83)Type of material - article, component partPublish date - 2014Language - englishCOBISS.SI-ID - 13258779
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Rek, Zlatko | 01371 |
Žun, Iztok | 03544 |
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