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Investigation of the combination of TiO 2 nanoparticles and drag reducer polymer effects on the heat transfer and drag characteristics of nanofluids
Author(s) -
Paryani Sadra,
Ramazani S.A. Ahmad
Publication year - 2018
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.23121
Subject(s) - nusselt number , drag coefficient , nanofluid , drag , materials science , heat transfer , heat transfer coefficient , thermodynamics , convective heat transfer , reynolds number , suspension (topology) , turbulence , mechanics , physics , pure mathematics , mathematics , homotopy
To compensate for drag increment due to the addition of nanoparticles to heat‐transfer fluids, it seems that one could add drag reducer polymeric agents to these fluids. So, in this work, experiments were carried out for solutions of two types of polyacrylamide (FLOPAAM 3330S and FLOPAAM 3630S) at three distinct concentrations (25, 40, and 55 ppm), and TiO 2 ‐water nanofluid at concentrations of 0.015, 0.02, 0.025, and 0.03 L/L. The steady state turbulent convective heat transfer and the friction factor of the suspension of TiO 2 in a dilute solution of very high molecular weight, polyacrylamide (hybrid fluid), in a coiled tube were analyzed. Experimental measurements were carried out from a Reynolds number of 11 000 to 21 000 and a constant temperature (24 °C) of the cool bath. The obtained results have shown that for the suspension of nanoparticles, the Nusselt number and drag coefficient increase, whereas for dilute solutions containing only the drag reducer agent, both the Nusselt number and the drag coefficient decrease. However, the combination of the nanoparticle and polymeric drag reducer agent increased the heat transfer coefficient, but decreased the drag coefficient, especially at the highest measured Reynolds number (Re = 21 000).