Gas-phase heat transfer plays a critical role in many high temperature applications, such as preheaters, combustors, and other thermal equipment. In such cases common heat transfer augmentation methods rely on the convective component alone to achieve improved internal performance. Radiatively assisted heat transfer augmentation has been suggested as a way to overcome limitations in convective-only enhancement. One example of such a technique is the fiber array insert; thermal radiation emitted by tube walls is captured by a large number of slender fibers, which in turn convect heat to the flowing fluid. Previous numerical studies have indicated that this technique represents a promising enhancement method warranting further investigation. This paper presents results from an experimentally based feasibility study of fiber array inserts for heat transfer augmentation in an externally heated duct. Fibers composed of silicon carbide and stainless steel were assembled in arrays with porosities around 0.98, and were tested for empty-tube Reynolds numbers ranging from 17,500 to 112,500 and wall temperatures from ambient up to . The arrays cause a significant pressure drop—roughly two orders of magnitude higher than the empty-tube case—but tube-side heat transfer coefficients were improved by up to 100% over the convective-only case in the low flow rate regime. The stainless steel fiber array exhibited similar heat transfer performance as the silicon carbide case, although pressure drop characteristics differed owing to variations in fluid-structure flow phenomena. Pressure drop data were roughly within the range of d’Arcy law predictions for both arrays, and deviations could be explained by inhomogeneities in fiber-to-fiber spacing. Heat transfer was found to depend nonlinearly on wall temperature and flow rate, in contrast to previously reported numerical data.
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Heat Transfer Augmentation: Radiative-Convective Heat Transfer in a Tube With Fiber Array Inserts
Andreas Hantsch,
Andreas Hantsch
Institut für Wärmetechnik und Thermodynamik,
e-mail: hantscha@mailserver.tu-freiberg.de
TU Bergakademie Freiberg
, G.- Zeuner-Str. 7, 09599 Freiberg, Germany
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Ulrich Gross,
Ulrich Gross
Institut für Wärmetechnik und Thermodynamik,
e-mail: gross@iwtt.tu-freiberg.de
TU Bergakademie Freiberg
, G.- Zeuner-Str. 7, 09599 Freiberg, Germany
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Andrew R. Martin
Andrew R. Martin
Department of Energy Technology,
e-mail: andrew.martin@energy.kth.se
KTH
, Brinellvägen 68, 10044 Stockholm, Sweden
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Andreas Hantsch
Institut für Wärmetechnik und Thermodynamik,
TU Bergakademie Freiberg
, G.- Zeuner-Str. 7, 09599 Freiberg, Germanye-mail: hantscha@mailserver.tu-freiberg.de
Ulrich Gross
Institut für Wärmetechnik und Thermodynamik,
TU Bergakademie Freiberg
, G.- Zeuner-Str. 7, 09599 Freiberg, Germanye-mail: gross@iwtt.tu-freiberg.de
Andrew R. Martin
Department of Energy Technology,
KTH
, Brinellvägen 68, 10044 Stockholm, Swedene-mail: andrew.martin@energy.kth.se
J. Heat Transfer. Feb 2010, 132(2): 023505 (6 pages)
Published Online: December 2, 2009
Article history
Received:
October 30, 2008
Revised:
August 22, 2009
Online:
December 2, 2009
Published:
December 2, 2009
Citation
Hantsch, A., Gross, U., and Martin, A. R. (December 2, 2009). "Heat Transfer Augmentation: Radiative-Convective Heat Transfer in a Tube With Fiber Array Inserts." ASME. J. Heat Transfer. February 2010; 132(2): 023505. https://doi.org/10.1115/1.4000189
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