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Heat Transfer Research
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ISSN Druckformat: 1064-2285
ISSN Online: 2162-6561

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Heat Transfer Research

DOI: 10.1615/HeatTransRes.2018022685
pages 1689-1704

ENTRANSY DISSIPATION ANALYSIS OF LIQUID VORTEX ISOLATED BY HOLLOW CYLINDER

Fikret Alic
Faculty of Mechanical Engineering Tuzla, Department of Thermal and Fluid Technique, Tuzla, Bosnia and Herzegovina

ABSTRAKT

By insulating the vortex of the liquid with a hollow cylinder, the level of liquid inside the cylinder is raised. This phenomenon is caused by an air vacuum between the liquid vortex and the inside of the cylinder. At the bottom of the cylinder, a heat source is installed while the outer surface of the cylinder is thermally insulated. In this way, the cylinder can be considered as a hollow cylindrical fin. The heat from this fin is partially transmitted to the liquid. The analysis of the entransy of this system is based on the variation in the size of the inner convective cylinder surface and the angular velocity of the liquid vortex. In addition, an analysis of the entransy, efficiency, and thermal resistance of this system was carried out for the partial and complete filling of the cylinder with liquid. The novelty of this entransy analysis is in simultaneously raising and heating the liquid vortex within the hollow cylinder. By innovatively using an air vacuum above the liquid vortex, the hollow cylinder sucks the liquid vortex and the same is heated. The contribution of this research includes an established mathematical model of the entransy dissipation, which can be used in the case where the hollow cylinder is completely filled with liquid or when it is completely filled with air. The results obtained in this study are a good basis for further investigations and optimization of the various thermotechnical systems, especially in the chemical, mechanical, and process industries.


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