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Heat and Mass Transfer

, Volume 54, Issue 10, pp 2987–2994 | Cite as

Reconsideration of data and correlations for plate finned-tube heat exchangers

  • Milena Otović
  • Miloš Mihailović
  • Srbislav Genić
  • Branislav Jaćimović
  • Uroš Milovančević
  • Saša Marković
Original
  • 43 Downloads

Abstract

This paper deals with heat exchangers having plain finned tubes in staggered (triangular) pattern. The objective of this paper is to provide the heat transfer and friction factor correlation which can be used in engineering practice. For this purpose, the experimental data of several (most cited) authors who deal with this type of heat exchangers are used. The new correlations are established to predict the air-side heat transfer coefficient and friction factor as a function of the Reynolds number and geometric variables of the heat exchanger – tube diameter, tube pitch, fin spacing, tube rows, etc. In those correlations the characteristic dimension in Reynolds number is calculated by using the new parameter – volumetric porosity. Also, there are given the errors of those correlations.

Nomenclature

dc

collar diameter, m

dh

hydraulic diameter, m

f

Fanning friction factor

H

height of a heat exchanger channel, m

jH

Colburn heat transfer factor

L

length of the heat exchanger, m

\( \dot{m} \)

fluid flow rate, kg/s

Nl

number of tube rows

Nu

Nusselt number

Pr

Prandtl number

Re

Reynolds number based on hydraulic diameter

sf

fin pitch, m

SHE

air side heat exchange surface area (total outside surface area), m2

sl

longitudinal tube pitch, m

st

transversal tube pitch, m

Suf

unfined surface area (area of bare tubes between fins), m2

sV

specific surface, m2/m3

\( \dot{V} \)

fluid volume flow rate, m3/s

Vf

heat exchanger free volume, m3

VHE

volume of heat exchanger chamber, m3

W

width of a heat exchanger channel, m

wf

air velocity at the front of the heat exchanger, m/s

wε

air velocity reduced to the porous cross-section of the exchanger, m/s

z

number of experimental regimes (runs)

Greek

α

heat transfer coefficient, W/(m2∙K)

∆pHE

pressure drop, Pa

δ

fin thickness, m

ε

volumetric porosity, m3/m3

λ

thermal conductivity, W/(m∙K)

μ

dynamic viscosity, Pa∙s

ρ

average fluid density, kg/m3

ξ

Weisbach (Dracy) friction factor

Abbreviations

PD

pressure drop

HT

heat transfer

Notes

References

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Faculty of Mechanical EngineeringUniversity of BelgradeBelgradeSerbia
  2. 2.Tehnikum TaurunumBelgrade–ZemunSerbia

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