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On the examination of recycle on heat (and mass) transfer in concentric tubes
Author(s) -
Yeh HoMing,
Tsai ShauWei,
Hsiey MeanChu
Publication year - 1988
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450660210
Subject(s) - heat transfer , tube (container) , concentric , mechanics , pressure drop , mass transfer , materials science , volumetric flow rate , flow (mathematics) , residence time (fluid dynamics) , heat transfer enhancement , thermodynamics , heat transfer coefficient , composite material , mathematics , engineering , geometry , physics , geotechnical engineering
The effect of recycle on heat (and mass) transfer in concentric circular tubes has been investigated by finite difference methods. Theoretical results show that recycle can enhance the heat transfer rate for large Graetz numbers compared with that in an open tube (without an inner tube inserted and without recycle). Competition between a preheating effect and a residence‐time effect can be used to explain the heat transfer behavior. The heat transfer rate can be further augmented, with nearly no increase in total pressure drop, by employing flow pattern B instead of flow pattern A.