Experimental analysis of heat transfer enhancement within tube in tube heat exchanger by using nano fluid and jagged twisted tape inserts

Mechanical Engineering

Heat transfer & friction factor characteristics of CuO/water nanofluid have been experimentally inspected within tube in tube counter flow heat exchanger. The CuO/water nanofluid with nanopartical 0.1% by volume was engaged in circular tube equipped with full-length square jagged copper twisted tape inserts as a turbulators. Square jagged twisted tape inserts having twist ratios 4, 6 and 7 were used alternately by keeping the 0.1 vol% constant concentration of nano particles. The experimentation were performed and different readings for different set were recorded in turbulent regime with Reynolds number in between 2700 and 54000, to assessment of heat transfer increment and the friction factor. The attained results release that Nusselt number intensifies with increase in Reynolds number and shrinkage in twist ratio of twisted tape inserts. The synchronized use of square jagged twisted tape insert with twist ratio 4 and CuO/water nanofluid gives significant increase in Nusselt number value than that of the plain tube in tube heat exchanger.

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