Influence of X-Baffles on Heat Transfer and Friction Factor in a Heat Exchanger Tube

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Sujin Nuchprasert
Kwanchai Nanan
Uthai Phongrasamee
Senee Sirichai


This paper investigated the influence of X-baffles on heat transfer and friction factor in a heat exchanger tube. The test tube made of copper having 64 mm inner diameter (D) and 1500 mm length. The test tube was heated by an electrical wire provided uniform wall heat flux condition. The test tube was inserted the X-baffles which made of aluminum with width ratio (W/D) of 0.2. The X-baffles were placed in a test tube at three pitch ratios (P/D) of 1.0, 1.5 and 2.0. The working fluid was air and the investigations were examined for a range of Reynolds number 6000 to 20,000. The experimental results of inserted the X-baffles revealed that the Nusselt number and the friction factor were higher than those the typical baffles around 45% and 279% respectively.

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