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Pulsating flows in heat exchangers — an experimental study

Pulsierende Strömung in WÄrmetauschern — eine experimentelle Untersuchung

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Abstract

The effect of pulsating flows on the performance of a heat exchanger is studied experimentally. The experiments are conducted in a steam-water, double pipe heat exchanger for 500<Re<2200. The axial variation of the heat transfer coefficient is determined by collecting condensate at a number of axial sections. The results are presented in terms of a dimensionless distance and a dimensionless frequency. The results are compared with the experimental results of other investigations.

It is found that the results, if expressed in terms of the new parameters mentioned above, can be analysed in a rational manner. The contradictory experimental data, available in the literature, can be compared on this basis. It is also observed that pulsation can be made use of to augment heat transfer in heat exchangers with high Prandtl number fluids.

Zusammenfassung

Die Wirkung pulsierender Strömung auf die Leistung von WÄrmetauschern wurde experimentell untersucht, und zwar in einem Doppelrohr-Wasser/Dampf-WÄrmetauscher im Bereich 500 < Re < 2200. Die axiale Änderung des WÄrme-übergangskoeffizienten wurde durch Kondensatmessung in mehreren axialen Sektionen bestimmt. Die Ergebnisse werden in Termen eines dimensionslosen Abstands und einer dimensionslosen Frequenz mitgeteilt und mit fremden Ergebnissen verglichen. Es zeigt sich, da\ diese Art der Darstellung zu vernünftigen Ergebnissen führt. Widersprüchliche frühere Literaturwerte können auf diese Weise verglichen werden. Zur Erhöhung der WÄrmeübertragung können Pulsationen im Bereich hoher Prandtl-Zahlen beitragen.

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Abbreviations

C p :

specific heat of the fluid, J/kg ‡ C

f :

frequency of pulsation, cycles/second

h :

heat transfer coefficient, w/m2 C

k :

thermal conductivity of the fluid, w/m C

Nu:

Nusselt number,h(2r 0)/K

Pr:

Prandtl number,η C p/K

Re:

Reynolds number, 2u m·r 0 ϱ/η

r 0 :

radius of the circular pipe, m

T :

dimensionless temperature,\(\frac{{t - t_w }}{{t_\infty - t_w }}\)

t :

temperature, ‡C

u :

axial velocity, m/s

x :

axial distance, m

η :

viscosity, NS/m2

ϱ :

density, kg/m3

m:

mean value

o:

steady state value

p:

with pulsation

w:

conditions at the wall

∞:

conditions at the inlet to the pipe

References

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Authors and Affiliations

  1. BHEL Corporate R and D Divison, Hyderabad, India

    K. N. Krishnan (Senior Engineer)

  2. Department of Mechanical Engineering, Indian Institute of Technology, 600036, Madras, India

    V. M. K. Sastri (Prof. and Head Heat Transfer and Thermal Power Lab.)

Authors
  1. K. N. Krishnan
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  2. V. M. K. Sastri
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Krishnan, K.N., Sastri, V.M.K. Pulsating flows in heat exchangers — an experimental study. Wärme- und Stoffübertragung 16, 169–173 (1982). https://doi.org/10.1007/BF01679503

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  • DOI: https://doi.org/10.1007/BF01679503

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