Abstract
This paper presents a comparison of thermal performance of helical screw tape inserts in laminar flow of Al 2O 3/water and CuO/water nanofluids through a straight circular duct with constant heat flux boundary condition. The helical screw tape inserts with twist ratios Y = 1.78, 2.44 and 3 were used in the experimental study using 0.1% volume concentration Al 2O 3/water and CuO/water nanofluids. Nanofluids with required volume concentration of 0.1% were prepared by dispersing specified amounts of Al 2O 3 and CuO nanoparticles in deionised water. The performance analysis of helical screw tape inserts in laminar flow of Al 2O 3/water and CuO/water nanofluids is done by evaluating thermal performance factor for constant pumping power condition. Thermal performance factor of helical screw tape inserts using CuO/water nanofluid is found to be higher when compared with the corresponding value using Al 2O 3/water. Therefore, the helical screw tape inserts show better thermal performance when used with CuO/water nanofluid than with Al 2O 3/water nanofluid.
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