# Effect of Twisted - Tape Tubulators on Heat Transfer and Flow Friction inside a Double Pipe Heat Exchanger

Phitakwinai, Sutida;Nilnont, Wanich;Thawichsri, Kosart

• Accepted : 2015.11.16
• Published : 2015.12.31
• 14 3

#### Abstract

Computational fluid dynamics (CFD) has been employed for the Heat exchanger efficiency of a counter flow heat exchanger. The Heat exchanger efficiency has been assessed by considering the computed Nusselt number and flow friction characteristics in the double pipes heat exchanger equipped with two types twisted-tapes: (1) single clockwise direction and (2) alternate clockwise and counterclockwise direction. Cold and hot water are used as working fluids in shell and tube side, respectively. Hot and cold water inlet mass flow rates ranging are between 0.04 and 0.25 kg/s, and 0.166 kg/s, respectively. The inlet hot and cold water temperatures are 54 and $30^{\circ}C$, respectively. The results obtained from the tube with twisted-tapes insert are compared with plain tube. Nusselt number and friction factor obtained by CFD simulations were compared with correlations available in the literature. The numerical results were found in good agreement with the results reported in literature.

#### Keywords

CFD;Twisted-tape;Double pipe Heat Exchanger;Heat exchanger efficiency

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