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Research Papers: Evaporation, Boiling, and Condensation

Pseudoplasticity and Dynamic Interfacial Tension Relaxation Effects on Nucleate Pool Boiling in Aqueous Polymeric Liquids

[+] Author and Article Information
R. M. Manglik

Fellow ASME
Thermal-Fluids & Thermal Processing
Laboratory,
Department of Mechanical and Materials
Engineering,
University of Cincinnati,
Cincinnati, OH 45221-0072
e-mail: Raj.Manglik@uc.edu

A. D. Athavale

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

1Corresponding author.

2Present address: Seema Sales Pvt. Ltd., Pune 411038, India.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received November 27, 2018; final manuscript received January 15, 2019; published online March 27, 2019. Assoc. Editor: Debjyoti Banerjee.

J. Heat Transfer 141(5), 051502 (Mar 27, 2019) (10 pages) Paper No: HT-18-1775; doi: 10.1115/1.4042699 History: Received November 27, 2018; Revised January 15, 2019

Nucleate pool boiling heat transfer and its ebullient dynamics in polymeric solutions at atmospheric pressure saturated conditions are experimentally investigated. Three grades of hydroxyethyl cellulose (HEC) are used, which have intrinsic viscosity in the range 5.29 ≤ [η] ≤ 10.31 [dl/g]. Their aqueous solutions in different concentrations, with zero-shear viscosity in the range 0.0021 ≤ η0 ≤ 0.0118 [N⋅s/m2], exhibit shear-thinning rheology in varying degrees, as well as gas–liquid interfacial tension relaxation and wetting. Boiling heat transfer in solutions with constant molar concentrations of each additive, which are greater than their respective critical polymer concentration C*, is seen to have anomalous characteristics. There is degradation in the heat transfer at low heat fluxes, relative to that in the solvent, where the postnucleation bubble dynamics in the partial boiling regime is dominated by viscous resistance of the polymeric solutions. At higher heat fluxes, however, there is enhancement of boiling heat transfer due to a complex interplay of pseudoplasticity and dynamic surface tension effects. The higher frequency vapor bubbling train with high interfacial shear rates in this fully developed boiling regime tends to be influenced by increasing shear-thinning and time-dependent differential interfacial tension relaxation at the dynamic gas–liquid interfaces.

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References

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Figures

Grahic Jump Location
Fig. 1

General molecular structure of the HEC polymer

Grahic Jump Location
Fig. 2

Apparatus (not to scale) for experimental boiling measurements: (a) schematic of the pool boiling container and setup and (b) dimensional cut section of the cylindrical cartridge heater and sleeve assembly with thermocouple locations

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Fig. 3

Experimental data for saturated (atmospheric pressure) nucleate pool boiling in water, and their comparison with the predictions of some commonly used correlations in the literature for vetting of the measurements

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Fig. 4

Intrinsic viscosity data for the aqueous polymeric solutions of the three grades of HEC as represented by their respective Huggins (open symbols) plot, Eq. (4a), and Kraemer (filled symbols) plot, Eq. (4b).

Grahic Jump Location
Fig. 5

Apparent viscosity η and its variation with shear rate γ and concentration C in aqueous solution for the three grades of the HEC polymer (250-HR, 250-MR, and QP-300); the solid lines represent the modified power-law constitute relationship of Eq.(6)

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Fig. 6

Variation of equilibrium (large surface age) gas–liquid interfacial tension σ with concentration C in aqueous HEC solutions

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Fig. 7

Dynamic surface tension, or temporal variation in the gas–liquid interfacial tension in aqueous solutions of different grades and concentrations of HEC: (a) with C =2.5 × 10−9 mol/cc and (b) with C =4.0 × 10−9 mol/cc

Grahic Jump Location
Fig. 8

Variation in liquid–solid contact angle with additive concentration in aqueous solutions of HEC polymer

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Fig. 9

Pool boiling curve for water and measured data for aqueous HEC polymer solutions with a concentration of C =2.5 × 10−9  mol/cc

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Fig. 10

Variation in the heat transfer coefficient, relative to that of pure water, of aqueous solutions of three grades of HEC polymer (fixed concentration of C =2.5 × 10−9 mol/cc) with heater wall heat flux

Grahic Jump Location
Fig. 11

Photographic characterization of the ebullient or bubbling behavior of boiling in pure (deionized, distilled) water and in aqueous polymeric solutions, with constant concentration of 2.5 × 10−9 mol/cc in the latter case

Grahic Jump Location
Fig. 12

Pool boiling curve for water and measured data for aqueous HEC polymer solutions with a concentration of C =4.0 × 10−9 mol/cc

Grahic Jump Location
Fig. 13

Variation in the heat transfer coefficient, relative to that of pure water, of aqueous solutions of two grades of HEC polymer (fixed concentration of C =4.0 × 10−9 mol/cc) with heater wall heat flux

Grahic Jump Location
Fig. 14

Photographic characterization of the ebullient or bubbling behavior of boiling in aqueous polymeric solutions with constant concentration of 4.0 × 10−9 mol/cc

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