Aspects of coiled tube heat transfer |
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| Authors: | H A Simon S Manafzadeh Post Doc J C F Chow |
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| Institution: | (1) University of Illinois, Box 4348, 60680 Chicago, USA |
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| Abstract: | Enhancement of heat transfer performance, beyond that normally achieved in curved tube flows, is demonstrated for pulsatile flows and for developing flows. In the former, increases of greater than 20% are obtained and in the latter, a maximum increase of 60% is obtained.
Wärmeübergang in gewendelten Rohren Zusammenfassung Es wird gezeigt, daß der Wärmeaustausch in gebogenen Rohren gegenüber herkömmlichen Strömungen vergrößert werden kann. Für pulsierende Strömungen werden Steigungen von mehr als 20%, für Einlaufströmungen von maximal 60% beobachtet.
Nomenclature
a
Pipe radius
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De
Dean number=
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K
Pressure amplitude ratio
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Nu
Nusselt number
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Pr
Prandtl number
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R
Coil radius
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Re
Reynolds number
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T
Dimensionless temperature
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Z
Dimensionless axial length
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Dimensionless frequency=
-  m
Mean boundary layer thickness
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Excitation frequency
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Kinematic viscosity
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Dimensionless wave-length
Dedicated to Professor E. R. G. Eckert on the occasion of his 80th birthday |
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