Abstract
The influence of a surfactant, sodium lauryl sulfate (SLS), on the pool boiling behavior of aqueous polyacrylamide solutions has been investigated. The basic test section is a heated horizontal platinum wire submerged in a saturated pool of liquid at atmospheric pressure. Results are reported for six combinations of deionized water, polyacrylamide and surfactant. Measurements of surface tension and steady shear apparent viscosity are reported for each working solution.
The boiling heat transfer performance of deionized water containing concentrations of 250 and 1000 (parts per million by weight) wppm of the surfactant did not differ significantly from the values found for deionized water. For the 250 wppm aqueous polyacrylamide solution the boiling performance is poorer than that found for water alone. However, the addition of 250 wppm of SLS to the aqueous polyacrylamide solution resulted in a significant improvement in the boiling heat transfer performance compared to water. An increase in the surfactant concentration to 1000 wppm to the aqueous polymer solution revealed even greater improvement in the boiling performance. At a heat flux of 50 W/cm2, increases in the heat transfer coefficient were as much as 50% for the 250 wppm AP-30 — 250 wppm SLS solution and 100% the for 250 wppm AP-30 — 1000 wppm SLS solution as compared to deionized water alone.
On the basis of these results, it appears that the influence of surfactants on the boiling heat transfer performance of aqueous polymer solutions may be more significant than in the case where surfactants are added to Newtonian fluids.
Zusammenfassung
Es wurde der Einfluß des grenzflächenaktiven Stoffes Sodium-Lauryl-Sulfat (SLS) auf das Verhalten des freien Behältersiedens von Polyacrylamid-Lösungen untersucht. Die Testeinheit besteht aus einem beheizten Platindraht, der in einem mit Flüssigkeit (Umgebungsdruck) gefüllten Behälter eingetaucht ist. Ergebnisse wurden für sechs Kombinationen von vollentsalztem Wasser, Polyacrylamid-Lösungen und grenzflächenaktiven Stoffen untersucht. Messungen der Oberflächenspannung und Viskosität wurden für jedes Gemisch durchgeführt.
Der Wärmetransport beim Sieden von vollentsalztem Wasser mit einem Anteil an SLS von 250 bis 1000 wppm (parts per million by weight) unterscheidet sich nicht von dem bei reinem, vollentsalztem Wasser. Bei einer Lösung mit 250 wppm Polyacryl ist das Sieden schwächer als bei reinem Wasser. Bei einer Zugabe von 250 wppm SLS zur Polyacryl-Lösung ist eine signifikante Zunahme des Wärmetransportes beim Sieden festzustellen. Ein Erhöhen der SLS-Konzentration auf 1000 wppm verstärkt nochmals diese Zunahme. Bei einem Wärmefluß von 50 W/cm2 erhöht sich der Wärmetransportkoeffizient bei der AP-30 — 250 wppm SLS Lösung um 50% und bei der AP-30 — 1000 wppm SLS Lösung um 100% im Vergleich zum vollentsalzten Wasser.
Mit diesen Ergebnissen wird deutlich, daß der Einfluß von grenzflächenaktiven Stoffen auf den Wärmetransport beim Sieden von polymeren Lösungen signifikanter als im Falle von Newtonschen Fluiden ist.
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Abbreviations
- q″ :
-
heat flux, (W/cm2)
- T :
-
fluid temperature, (°C)
- T sat :
-
saturation temperature of the fluid, (°C)
- T w :
-
surface wall temperature, (°C)
- ΔT :
-
=T w−T sat, (°C)
- η :
-
steady shear apparent viscosity, (poise)
- \(\dot \gamma\) :
-
shear rate, (sec−1)
- σ :
-
surface tension, (dyne/cm)
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Dedicated to Prof. Dr.-Ing. U. Grigull's 80th birthday
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Wang, A.T.A., Hartnett, J.P. Influence of surfactants on pool boiling of aqueous polyacrylamide solutions. Wärme- und Stoffübertragung 27, 245–248 (1992). https://doi.org/10.1007/BF01589922
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DOI: https://doi.org/10.1007/BF01589922