Proceedings Vol. 23 (2017)
ENGINEERING MECHANICS 2017
May 15 – 18, 2017, Svratka, Czech Republic
Copyright © 2017 Brno University of Technology, Faculty of Mechanical Engineering, Institute of Solid Mechanics, Mechatronics and Biomechanics, Brno
ISSN 1805-8248 (printed)
ISSN 1805-8256 (electronic)
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pages 694 - 697, full text
This study deals with an experimental investigation of Fe3O4-water nanofluid flowing through a circular tube. Flow is maintained in the turbulent region and tube is exposed to constant heat flux along the length. Experiments are conducted to study the entropy generation of nanofluid for different particle volume concentrations varying from 1 % to 6 % and also for the different Reynolds numbers. Measured data from the experimentation is taken as input to calculate the thermal entropy and frictional entropy generation. Finally total entropy generation and Bejan number are calculated and analyzed. Experimentally it is proved that the changes in the thermal and frictional entropy generations are opposite, such a way that, as particle concentration increases thermal entropy generation decreases whereas frictional entropy generation increases. Finally experimental results reveal that there exits an optimum particle volume concentration where the total entropy generation is minimal. The same result has also appended by calculating the Bejan number.
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