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RESEARCH PAPERS: Evaporation, Boiling, and Condensation

Additive Adsorption and Interfacial Characteristics of Nucleate Pool Boiling in Aqueous Surfactant Solutions

[+] Author and Article Information
Juntao Zhang

Thermal-Fluids and Thermal Processing Laboratory, Department of Mechanical, Industrial and Nuclear Engineering,  University of Cincinnati, Cincinnati, OH 45221-0072

Raj M. Manglik1

Thermal-Fluids and Thermal Processing Laboratory, Department of Mechanical, Industrial and Nuclear Engineering,  University of Cincinnati, Cincinnati, OH 45221-0072Raj.Manglik@uc.edu

1

Author to whom all correspondence should be addressed.

J. Heat Transfer 127(7), 684-691 (Jan 10, 2005) (8 pages) doi:10.1115/1.1924626 History: Received May 04, 2004; Revised January 10, 2005

Interfacial phenomena and ebullient dynamics in saturated nucleate pool boiling of aqueous solutions of three surfactants that have different molecular weight and ionic nature are experimentally investigated. The additive molecular mobility at interfaces manifests in a dynamic surface tension behavior (surfactant adsorption–desorption at the liquid–vapor interface), and varying surface wetting (contact angle) with concentration (surfactant physisorption at the solid–liquid interface). This tends to change, enhance, and control the boiling behavior significantly, and an optimum heat transfer enhancement is obtained in solutions at or near the critical micelle concentration (CMC) of the surfactant. Furthermore, wettability (contact angle) is observed to be a function of the molecular makeup of the reagent, and shows distinct regions of change along the adsorption isotherm that are associated with the aggregation mode of adsorbed ions at the solid–water interface. This distinguishably alters the ebullience from not only that in pure water, but also between pre- and post-CMC solutions. Increased wetting tends to suppress nucleation and bubble growth, thereby weakening the boiling process.

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Copyright © 2005 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic of interfacial phenomena in aqueous surfactant solutions (not to scale)

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Figure 2

Schematic of experimental facility: (a) pool boiling apparatus, and (b) cross-sectional view of cylindrical heater assembly

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Figure 3

Equilibrium surface tension measurements for aqueous surfactant solutions at 23°C and 80°C

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Figure 4

Dynamic surface tension measurements for aqueous surfactant solutions

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Figure 5

(a) Schematic of surfactant transport process during a bubble formation and departure (not to scale); (b) Dynamic surface tension effect on bubble dynamics (evolution of pre-departure shape and size)

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Figure 6

Measured contact angle θ for aqueous surfactant solutions

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Figure 7

Nucleate pool boiling data for aqueous solutions of (a) SDS, (b) CTAB, and (c) Triton X-305

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Figure 8

Effects of surfactant molecular weight and dynamic surface tension on the optimum heat transfer coefficient enhancement

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Figure 9

Boiling behavior for distilled water, and aqueous SDS, CTAB, and Triton X-305 solutions of different concentrations at qw″=20kW∕m2 and 50kW∕m2

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Figure 10

Characterization of nucleate pool boiling and its determinants in aqueous surfactant solutions

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