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Nucleate Pool Boiling of a Surface Active Polymer (HEC) Solution

[+] Author Affiliations
Juntao Zhang, Raj M. Manglik, Manish Bahl

University of Cincinnati, Cincinnati, OH

Paper No. IMECE2003-42311, pp. 115-121; 7 pages
doi:10.1115/IMECE2003-42311
From:
  • ASME 2003 International Mechanical Engineering Congress and Exposition
  • Heat Transfer, Volume 4
  • Washington, DC, USA, November 15–21, 2003
  • Conference Sponsors: Heat Transfer Division
  • ISBN: 0-7918-3718-1 | eISBN: 0-7918-4663-6, 0-7918-4664-4, 0-7918-4665-2
  • Copyright © 2003 by ASME

abstract

Saturated, nucleate pool boiling in aqueous solutions of a surface active polymer (Hydroxyethyl Cellulose or HECQP300, molecular weight ∼ 4–6 × 105 ) on a horizontal, cylindrical heater has been experimentally investigated. Boiling curves (qw ∝ ΔTsat ) for different concentration solutions, enhanced heat transfer coefficient data, and photographic records of the typical ebullience are presented. The measured surface tension (both equilibrium and dynamic) and shear-rate dependent viscosity variations with concentration are also included. The enhancement in nucleate boiling is seen to increase with polymer concentration in the aqueous solution, with an optimum level attained near the critical polymer concentration (c.p.c., ∼ 600 wppm). At higher concentration, the enhancement decreases considerably. Adsorption of macro-molecules, or agglomerates of smaller monomers onto a heating surface that favors the formation of new nucleation sites, together with a decreased dynamic surface tension, are responsible for the general growth in the number of active bubbles. In solutions with C > c.p.c., however, higher viscosity tends to suppress the micro-convection near the wall and the growth of bubbles, thereby weakening the boiling process. The photographic observations also depict an altered ebullient behavior (bubble shape and size, foaming, and nucleation frequency) in polymer solutions when compared to that of pure water.

Copyright © 2003 by ASME

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