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Conclusions

  • Sujoy Kumar Saha
  • Hrishiraj Ranjan
  • Madhu Sruthi Emani
  • Anand Kumar Bharti
Chapter
Part of the SpringerBriefs in Applied Sciences and Technology book series (BRIEFSAPPLSCIENCES)

Abstract

The following conclusions may be drawn from the discussion made in this research monograph:

The following conclusions may be drawn from the discussion made in this research monograph:
  • Insert devices are not good competitor with internally finned tubes or roughness for turbulent flow.

  • However, insert devices are good for laminar flow of viscous liquids.

  • Integral roughness is not good for laminar flow since the roughness is too small to enhance a laminar flow.

  • Insert devices are used to upgrade the performance of an existing heat exchanger having a plain inner tube surface

  • Major insert devices are twisted tapes, wire coil inserts, extended surface inserts, mesh or brush inserts and displaced inserts

  • Many design correlations are available for inserts, but this is not enough.

  • More research on tangential swirl injection is needed.

  • More information on performance characteristics with various insert devices is needed.

  • Research on fouling with insert devices is necessary.

  • Significant progress has been made in the design and manufacture of roughened surfaces. However, more advanced research is necessary.

  • A properly designed rough surface must have good efficiency index.

  • More and more advanced manufacturing techniques are likely to give better rough surfaces for enhancement.

  • Geometrical similarity makes the design of rough surfaces more convenient.

  • Although predictive methods have already made significant inroads, better predictive models are required for rough surfaces.

  • Heat transfer surface fouling is a matter of concern for rough surfaces.

Copyright information

© The Author(s), under exclusive license to Springer Nature Switzerland AG 2020

Authors and Affiliations

  • Sujoy Kumar Saha
    • 1
  • Hrishiraj Ranjan
    • 1
  • Madhu Sruthi Emani
    • 1
  • Anand Kumar Bharti
    • 1
  1. 1.Mechanical Engineering DepartmentIndian Institute of Engineering Science and Technology, ShibpurHowrahIndia

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