Entropy Generation Analysis
Of Engineered Heat Transfer Fluids
Under A Constant Surface Temperature
Author(s)
G. Soriano, G. Bravo, P. Guevara & F. Porras
Abstract
An assessment of the use of engineered heat transfer fluids working under
constant wall temperature conditions in the turbulent regime is presented. An
analysis of entropy generation and pumping power on the system working with
different engineered heat transfer fluids is performed. Three types of fluids are
considered: multiwalled carbon nanotube (MWCNT) based nanofluids, slurries
with microencapsulated phase change materials (MPCM) and a mixture of both
fluids. Specific heat, thermal conductivity and viscosity of the fluids are included
in the analysis using theoretical and experimental results available in literature.
Nanofluids in the system result on greater entropy generation and pumping
power consumption when compared with base fluid. MPCMs slurries produce
the minimum entropy generation and pumping power consumption. Mixtures are
affected by the content of nanofluids resulting in a performance below of
MPCMs slurries. The improvement on the heat capacity of the fluid produced by
the Microencapsulated phase change material is the main factor in reducing
entropy generation and pumping power consumption for the system. Under the
conditions assessed, the increase in viscosity offsets the increase in thermal
conductivity on the MWCNT based nanofluids. On the other hand in the case of
MPCM slurries, the increase in heat capacity outweighs the reduction in thermal
conductivity and increase in viscosity.
Keywords: entropy, engineered fluids, MWCNT nanofluids, MPCM slurries.
Keywords
entropy, engineered fluids, MWCNT nanofluids, MPCM slurries.
Related Book
Other papers in this volume
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