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Heat transfer enhancement and pressure drop in viscous liquid flows in isothermal tubes with twisted-tape inserts

Verbesserung der Wärmeübertragung und des Druckverlustes von viskosen Flüssigkeitsströmungen in isothermen Rohren mit Spiralband-Einsatz

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Abstract

Heat transfer enhancement in viscous liquid flows by means of twisted-tape inserts has been investigated in this study. Internal flows in horizontal tubes with uniform wall temperature have been considered. This is representative of typical conditions encountered in practical applications in the chemical and process industry. Experimental data were obtained for water and ehtylene glycol with snug-fit tape inserts of three different twist ratios,y=3.0, 4.5, and 6.0; the tape thickness in each case was 0.483 mm. The data cover a wide range of flow parameters: 3.5<Pr<100, and 300<Re<35,000, for both heating and cooling conditions. The results forNu m andf are strongly influenced by the tape geometry and fluid flow conditions, and can be functionally represented byNu m=φ(Re, Pr, μ b/μw,L/d, H/d, δ/d) andf=φ(Re, H/d, δ/d).

Zusammenfassung

In dieser Untersuchung wurde die Verbesserung des Wärmeübergangs in viskosen Flüssigkeitsströmungen mittels eines Spiralband-Einsatzes erforscht. Es wurden Strömungen in horizontalen Rohren mit einheitlicher Wandtemperatur betrachtet. Diese sind repräsentativ für typische Bedingungen, die in praktischen Anwendungen in der chemischen und weiterverarbeitenden Industrie anzutreffen sind. Für Wasser und Äthylen-Glykol wurden experimentelle Daten für eingepaßte Band-Einsätze mit drei unterschiedlichen Verdrehungsverhältnisseny=3.0, 4.5 und 6.0 erhalten; die Breite des Bandes betrug jeweils 0.483 mm. Die Daten decken einen weiten Bereich von Strömungsparametern ab: 3.5<Pr<100 und 300<Re<35,000 für die beiden Betriebsbedingungen Heizen und Kühlen. Die Ergebnisse fürNu m undf sind stark abhängig von der Bandgeometrie und den Strömungsbedingungen und können zweckmäßig durchNu m=φ(Re, Pr, μ b/μw,L/d, H/d, δ/d) undf=φ(Re, H/d, δ/d) dargestellt werden.

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Abbreviations

A :

heat transfer area, m2

c p :

specific heat at constant pressure, J/kg·K

d :

tube inside diameter, m

d h :

hydraulic diameter, m

f :

Fanning friction factor

h :

mean heat transfer coefficient, W/m2·K

H :

180° twist pitch, m

k :

fluid thermal conductivity, W/m · K

L :

heated length, m

\(\dot m\) :

mass flow rate, kg/s

Nu :

Nusselt number based on inside diameter,h d/k

Pr :

Prandtl number,μ c p/k

q :

heat transfer rate, W

Re :

Reynolds number based on empty tube diameter, 4006D-0307;/π dμ

T :

fluid temperature, °C or K

ΔT m :

log-mean temperature difference, K

U :

overall heat transfer coefficient, W/m2·K

UHF:

uniform axial heat flux with constant peripheral wall temperature

UWT:

constant axial and peripheral wall temperature

y :

twist ratio,H/d

δ :

thickness of twisted tape, m

μ :

fluid dynamic viscosity, kg/m·s

ϱ :

fluid density, kg/m3

b :

at bulk fluid temperature

h :

based on hydraulic diameter

i :

at duct inlet; tube inside surface

m :

mean or average

o :

at duct outlet; tube outside surface

s :

shellside flow conditions

t :

tubeside flow conditions

w :

tube wall

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Authors and Affiliations

  1. Department of Mechanical, Industrial and Nuclear Engineering, University of Cincinnati, 45221-0072, Cincinnati, OH, USA

    R. M. Manglik

  2. Rensselaer Polytechnic Institute, 12180-3590, Troy, NY, USA

    A. E. Bergles

Authors
  1. R. M. Manglik
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  2. A. E. Bergles
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Dedicated to Prof. Dr.-Ing. U. Grigull's 80th birthday

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Manglik, R.M., Bergles, A.E. Heat transfer enhancement and pressure drop in viscous liquid flows in isothermal tubes with twisted-tape inserts. Wärme- und Stoffübertragung 27, 249–257 (1992). https://doi.org/10.1007/BF01589923

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