Numerical Simulation of Tube inTube Heat Exchanger withTwisted Tape Insert
Journal Title: IOSR Journal of Mechanical and Civil Engineering (IOSR-JMCE) - Year 2018, Vol 15, Issue 3
Abstract
In this article without application of external power we can enhance the heat transfer rate by modifying the design by providing the twisted tape insert in tubes, extended surface or swirl flow devices. The turbulent flow model with counter flow heat exchanger is considered for analysis purpose. The P/d ratio is 4, 5, 7. Nusselt number, friction factor, pumping power required and LMTD variation of inner fluid with respect to Reynolds number is found out for different P/d ratio. The optimize Reynolds number for maximum heat transfer and minimum power loss is found out by graph intersection methods. From the results complicated behavior of fluid flow is captured for both the fluids flowing inside the tube. With increases in P/d ratio the Nusselt number will decreases and the outer wall boundary condition does not have any significant effect on the inner Nusselt number. The Darcy friction factor decreases with increase in Reynolds number. The Pumping power increases with increase in Reynolds number for all the condition of P/d ratio and for all the boundary conditions. Log mean temperature difference (LMTD) increases at a steady rate with increase in Reynolds number. The optimization point between Nu and pumping power with respect to Re; shifts toward the higher Reynolds number with increase in P/d ratio.
Authors and Affiliations
Satish Kumar Aharwar, Dr. Ajay Singh, Ashish Verma
Keywords
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- EP ID EP437933
- DOI 10.9790/1684-1503036578.
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