Effect of Full Length Twisted Tape Inserts on Heat Transfer and Friction Factor Enhancement with Fe3O4 Magnetic Nanofluid Inside a Plain Tube: An Experimental Study

• Main Authors: L. Syam, Sundar, Kumar, N. T. Ravi, Naik, M. T., Sharma, K. V.
• Format: Article
• Language: English
• Published: Elsevier 2012
• Subjects: TJ Mechanical engineering and machinery
• Online Access: http://umpir.ump.edu.my/id/eprint/6818/1/Effect%20of%20Full%20Length%20Twisted%20Tape%20Inserts%20on%20Heat%20Transfer%20and%20Friction%20Factor%20Enhancement%20with%20Fe3O4%20Magnetic%20Nanofluid%20inside%20a%20Plain%20Tube-%20An%20Experimental%20Study.pdf; http://umpir.ump.edu.my/id/eprint/6818/; http://dx.doi.org/10.1016/j.ijheatmasstransfer.2012.02.040
• Institution: Universiti Malaysia Pahang Al-Sultan Abdullah

Turbulent convective heat transfer and friction factor characteristics of magnetic Fe3O4 nanofluid flowing through a uniformly heated horizontal circular tube with and without twisted tape inserts are estimated experimentally. Experiments are conducted in the particle volume concentration range of 0 < u < 0.6%, twisted tape inserts of twist ratio in the range of 0 < H/D < 15and Reynolds number range of 3000 < Re < 22000. Heat transfer and friction factor enhancement of 0.6% volume concentration of Fe3O4 nanofluid in a plain tube with twisted tape insert of twist ratio H/D = 5 is 51.88% and 1.231 times compared to water flowing in a plain tube under same Reynolds number. Generalized regression equation is presented for the estimation of Nusselt number and friction factor for both water and Fe3O4 nanofluid in a plain tube and with twisted tape inserts under turbulent flow condition.