Comparative Study on Heat Transfer Enhancement of Low Volume Concentration of Al 2 o 3 –Water and Carbon Nano-Tube–Water Nano-Fluids in Transition Regime Using Helical Screw Tape Inserts.

Chougule, Sandesh S.; Sahu, S. K.

This study reports the comparison of heat transfer and friction factor characteristics of helical screw inserts in Al2O3–water and carbon nano-tube–water nano-fluids through a straight pipe in transition regime with constant heat flux boundary condition. Experiments were carried out by using 0.15% volume concentration of Al2O3–water and carbon nano-tube–water nano-fluid with helical tape inserts of twist ratio, TR = 1.5, 2.5, and 3. The thermal performance of helical screw tape inserts with the carbon nano-tube–water nano-fluid is found -to be higher when compared to the Al2O3–water nano-fluid. In addition, the maximum enhancement in heat transfer was obtained for the carbon nano-tube–water nano-fluid with helical tape inserts of twist ratio 1.5. The increase in pressure drop of the Al2O3–water nano-fluid with helical screw tape inserts is found to be higher compared to the carbon nano-tube–water nano-fluid helical screw tape inserts at lower value of twist ratio.

HEAT convection; CARBON nanotubes; NANOFLUIDS; ALUMINUM oxide; HEAT flux; COMPARATIVE studies; FRICTION

Experimental Heat Transfer, 2016, Vol 29, Issue 1, p17

0891-6152

Academic Journal

10.1080/08916152.2014.926432