Abstract
The following conclusions may be drawn from the discussion made in this research monograph:
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The following conclusions may be drawn from the discussion made in this research monograph:
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Insert devices are not good competitor with internally finned tubes or roughness for turbulent flow.
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However, insert devices are good for laminar flow of viscous liquids.
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Integral roughness is not good for laminar flow since the roughness is too small to enhance a laminar flow.
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Insert devices are used to upgrade the performance of an existing heat exchanger having a plain inner tube surface
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Major insert devices are twisted tapes, wire coil inserts, extended surface inserts, mesh or brush inserts and displaced inserts
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Many design correlations are available for inserts, but this is not enough.
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More research on tangential swirl injection is needed.
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More information on performance characteristics with various insert devices is needed.
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Research on fouling with insert devices is necessary.
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Significant progress has been made in the design and manufacture of roughened surfaces. However, more advanced research is necessary.
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A properly designed rough surface must have good efficiency index.
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More and more advanced manufacturing techniques are likely to give better rough surfaces for enhancement.
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Geometrical similarity makes the design of rough surfaces more convenient.
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Although predictive methods have already made significant inroads, better predictive models are required for rough surfaces.
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Heat transfer surface fouling is a matter of concern for rough surfaces.
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© 2020 The Author(s), under exclusive license to Springer Nature Switzerland AG
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Saha, S.K., Ranjan, H., Emani, M.S., Bharti, A.K. (2020). Conclusions. In: Insert Devices and Integral Roughness in Heat Transfer Enhancement. SpringerBriefs in Applied Sciences and Technology(). Springer, Cham. https://doi.org/10.1007/978-3-030-20776-2_8
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DOI: https://doi.org/10.1007/978-3-030-20776-2_8
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Online ISBN: 978-3-030-20776-2
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