Drag reducing nanofluids can reduce flow resistance and enhance fluid convective heat transfer. In this study

the convective heat transfer coefficient and flow resistance coefficient were determined experimentally at the Reynolds number of 4000—16000

with 0—0.5% mass fraction of graphite multi-walled carbon nanotubes

A12O3

Cu

Al

Fe2O3

and Zn nanoparticles added into a concentration of 100—400 mg·kg-1 cetyl trimethyl ammonium chloride (CTAC) drag reducing fluid. The ratio of the two fluids and preparation method were examined and the overall performance on convective heat transfer and flow characteristics was evaluated. The results show that the drag reducing fluid forming by sodium salicylate

CTAC and deionized water presents certain stability and significant drag reduction characteristic. At the drag reducing fluid concentration of 200 mg·kg-1

the drag reduction performance is the best. Graphite nanoparticles give better overall performance in enhancing convective heat transfer and reducing flow resistance among the nanoparticles. At 0.4%(mass) of graphite nanoparticles

the overall performance factor K is five times that with deionized water

presenting the best heat transfer and drag reduction characteristics

so it has good application prospects. Finally

a correlation is obtained by fitting the heat transfer and flow resistance of the drag reducing graphite nanofluid in circular tube

which is in good agreement with the experimental values.