Turbulent forced convection of Al₂O₃ nanofluid in a circular tube with tape inserts at low volume concentration
by L. Syam Sundar, K.V. Sharma, Y. Raja Sekhar, V. Dharma Rao, T. Subramanyam, J.V. Ramana Rao
International Journal of Nano and Biomaterials (IJNBM), Vol. 2, No. 1/2/3/4/5, 2009

Abstract: Convective heat transfer coefficients with Al₂O₃ nanofluid under turbulent flow in a circular tube fitted with twisted tape insert is estimated. The thermo-physical properties such as thermal conductivity and viscosity are established experimentally in a wide range of volume concentration and validated with values obtained by others. The heat transfer coefficient obtained with Al₂O₃ nanofluid having volume concentration of 0.02% is 10% higher when compared with water flowing in the tube at Re = 22,000. Tapes of different twist ratios in the range of 5 < H/D < 15 are used as tube inserts to evaluate nanofluid heat transfer and pressure drop. Nanofluid heat transfer coefficient is enhanced by 23% and maximum pressure drop by 1.7 times with tape insert in the range of H/D tested when compared to flow in a plain tube.

Online publication date: Sat, 08-Aug-2009

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