EXPERIMENTAL STUDIES ON FE3O4 NANOFLUID FLOWING THROUGH A CIRCULAR TUBE

Abstract eng:
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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