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

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Zhang, Juntao Raj, M. Manglik Bahl, Manish
Copyright Year	2003
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 (q″w ∝ 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.
Sponsorship	Heat Transfer Division
Starting Page	115
Ending Page	121
Page Count	7
File Format	PDF
ISBN	0791837181
DOI	10.1115/IMECE2003-42311
Volume Number	Heat Transfer, Volume 4
Conference Proceedings	ASME 2003 International Mechanical Engineering Congress and Exposition
Language	English
Publisher Date	2003-11-15
Publisher Place	Washington, DC, USA
Access Restriction	Subscribed
Subject Keyword	Viscosity Water Equilibrium (physics) Nucleate pool boiling Boiling Convection Molecular weight Nucleation (physics) Shear rate Photography Bubbles Polymer solutions Heating Nucleate boiling Surface tension Shapes Polymers Heat transfer coefficients
Content Type	Text
Resource Type	Article

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