Investigation of Trapezoidal-Cut Twisted Tape Insert in a Double Pipe U-Tube Heat Exchanger using Al2O3/Water Nanofluid. (2015)

• Record Type: Journal Article
• Authors: Prasad, P.V. Durga; Gupta, A.V.S.S.K.S.; Deepak, K.
• Is Part Of: Procedia materials science. Volume 10(2015)Supplement
• Page Start: 50
• Page End: 63
• Publication Date: 2015
• Subjects: Nanofluid -- Heat exchanger -- Friction factor -- Heat transfer enhancement -- Trapezoidal-cut twisted tape inserts.; Materials science -- Congresses; Materials science -- Periodicals; Materials science; Conference proceedings; Periodicals; 620.11
• DOI: 10.1016/j.mspro.2015.06.025
• Languages: English
• ISSNs: 2211-8128

Abstract

Abstract: An attempt is made to enhance the rate of heat transfer in heat exchangers using Al2 O3 nanofluid. In this work an experimental analysis on trapezoidal-cut twisted tape insert in a double pipe U-tube heat exchanger using Al2 O3 water based nanofluid is presented. The heat transfer coefficients and the corresponding friction factors required for performance analysis are determined taking into account the typical operating conditions of the heat exchangers in turbulent flow regimes with particle volume concentration of 0.01% and 0.03% and twist ratios ranging between 5 and 20. Experimental data is generated at flow rates ranging from 0.0333 kg/s to 0.2667 kg/s. Experimental data is generated with water and nanofluid for Reynolds number in the range 3000<Re<30000, the Nusselt number of entire pipe for 0.03% concentrations of nanofluid with trapezoidal-cut twisted tape inserts of H/D = 5 is enhanced by 34.24% as compared to water. The friction factor of entire pipes for 0.03% concentration of nanofluid with trapezoidal-cut twisted tape inserts of H/D=5 is enhanced by 1.29 times as compared to water. The results of the investigation indicate an enhancement in the performance parameters of the heat exchanger namely heat transfer coefficient and friction factor with an increase in volume concentration of the nanoparticle.