Analysis of Effect of Concentric Perforated Tube Inserts on Augmenting Heat Transfer in a Return Bend Heat Exchanger
K. P. V. Krishna Varma†*, P. Sridhar†, K. S. S. Mohan‡, Shanmuga Sundaram‡†
† Department of Mechanical Engineering, CMR College of Engineering & Technology, Telangana, India
‡ Department of Mechanical Engineering, Aditya College of Engineering and Technology, Surampalem, Andhra Pradesh, India
‡† Department of Mechanical Engineering, CMR Technical Campus, Telangana, India
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This work reports on CFD analysis carried out on a double pipe heat exchanger fitted with perforated tube inserts under fully turbulent flow regime. k-€ turbulence model along with enhanced wall functions was used to capture the near wall region effects. Mass flow rate and temperatures at the inlet of the test section were maintained as 0.1 kg/s and 333K. Mass flow rate of the cold fluid was varied from 0.05 kg/s to 0.25 kg/s. Temperature of the cold fluid was maintained as 303K at the inlet. Analysis was carried out to analyse the temperature, velocity, pressure and turbulence contours of double pipe heat exchanger fitted with perforated tubes and modified geometry perforated tubes. Data was generated for the same and the outcomes depict that there was a significant intensification in heat transfer with the insertion of perforated tube inserts and geometry modified tube inserts inside the tubes of the heat exchanger.