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Journal ArticleDOI

Nucleate Boiling Heat Transfer of Binary Mixtures at Low to Moderate Heat Fluxes

01 May 1999-Journal of Heat Transfer-transactions of The Asme (American Society of Mechanical Engineers)-Vol. 121, Iss: 2, pp 365-375
TL;DR: In this article, a model for nucleate pool boiling heat transfer of binary mixtures has been proposed based on an additive mechanism, which takes into account the microroughness of the heating surface which has been defined quantitatively.
Abstract: Nucleate boiling is characterized by the formation of vapor at preferred sites (nucleation sites) on a heating surface that is submerged in the liquid and maintained at a temperature above the saturation temperature of the liquid. In the present study, a model has been developed for pool boiling of binary mixtures based on an additive mechanism. Nucleate pool boiling of binary mixtures finds many applications in the refrigeration and air conditioning industry, the chemical process industries, such as the liquid natural gas industry, and in the reboilers of distillation columns among others. Here, a model for nucleate pool boiling heat transfer of binary mixtures has been proposed based on an additive mechanism. The contributing modes of heat transfer are (i) the heat transferred by microlayer evaporation, (ii) the heat transferred by transient conduction during the reformation of the thermal boundary layer, and (iii) the heat transferred by turbulent natural convection. The model takes into account the microroughness of the heating surface which has been defined quantitatively. The model compares satisfactorily with data obtained in the present study and in the literature. These data were obtained on a variety of heating surfaces such as a vertical platinum wire, a horizontal stainlessmore » steel tube and flat horizontal aluminium, and stainless steel surfaces (with various surface finishes) thereby demonstrating the validity of the model.« less
Citations
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Journal ArticleDOI
TL;DR: In this paper, a new correlation to estimate mixture heat transfer coefficients has been proposed in terms of an ideal heat transfer coefficient and a correction term for the presence of other liquids and it was found that the performance of literature correlations improved considerably.

46 citations


Cites background or methods from "Nucleate Boiling Heat Transfer of B..."

  • ...The boiling data, liquids studied and the surfaces used by Van Stralen [31], Tzan and Yang [32] have been summarized by Benjamin and Balakrishnan [17]....

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  • ...Therefore, the pure component data of Kurihara and Myers [27], Zuber [28], Kadhum et al. [5], Benjamin and Balakrishnan [29], Nageswara Reddy [30] and the data obtained in the present study were used to develop a correlation for ideal heat transfer coefficient....

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  • ...Benjamin and Balakrishnan [19] while studying acetone–CCl4 and n-hexane–CCl4 systems observed that heat flux (and the nucleation site density) decreases when a more volatile component is added to a high boiling liquid and then increases as the concentration of the more volatile component in the liquid mixture increases....

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  • ...(9) and (11) we obtain, h hid ¼ DTeff DT ð12Þ In an earlier study, Benjamin and Balakrishnan [17] developed a model for heat flux for binary mixtures....

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  • ...In an earlier study, Benjamin and Balakrishnan [17] developed a model for heat flux for binary mixtures....

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Journal ArticleDOI
TL;DR: In this article, the authors present nucleate boiling experimental results, at atmospheric pressure, for heat fluxes q ≥ 40kW/m2, for FC-87/FC-72 binary mixtures in molar fractions of 0/100, 25/75, 50/50, 75/25, 85/15 and 100/0, at saturation temperatures for pure fluids and bubble points for mixtures.
Abstract: This paper presents nucleate boiling experimental results, at atmospheric pressure, for heat fluxes q ≤ 40 kW/m2, for FC-87/FC-72 binary mixtures in molar fractions of 0/100, 25/75, 50/50, 75/25, 85/15 and 100/0, at saturation temperatures for pure fluids and bubble points for mixtures. The test section was an upward facing copper disc of 12 mm diameter and 1 mm thickness. The experimental heat transfer coefficient was compared with the correlations of Rohsenow (1952), as reported by Rohsenow et al. (Handbook of heat transfer, McGraw-Hill, New York, 1998), Stephan and Abdelsalam (Int J Heat Mass Transfer 23;73–78, 1978) and Cooper (Int Chem Eng Symp Ser 86:785–792, 1984) for pure fluids and the semi-empirical models of Stephan and Korner (Chem Ing Tech Jahrg 7:409–484, 1969), Thome (J Heat Transfer 104:474–478, 1982), Fujita et al. (1996), as reported by Rohsenow et al. (Handbook of heat transfer, McGraw-Hill, New York, 1998), Fujita and Tsutsui (Int J Heat Mass Transfer 37(1):291–302, 1994) and Calus and Leonidopoulos (Int J Heat Mass Transfer 17:249–256, 1973) for mixtures.

7 citations


Cites background from "Nucleate Boiling Heat Transfer of B..."

  • ...Benjamim and Balakrishnan [ 5 ] considered that the extent of the decrease in h for mixtures is dependent on the thermophysical properties, the apparent reduction in the bubble departure rate and the decrease in the departure bubble diameter, along with the non-linear dependence of the properties on the molar fraction....

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Journal ArticleDOI
TL;DR: In this paper, a new correlation has been proposed for the heat flux in terms of Archimedes number, Prandtl number, surface-liquid interaction parameter, modified Jakob number, dimensionless surface roughness group, properties-profile parameter and an effective temperature driving force.
Abstract: Steady state pool boiling heat flux data has been obtained for acetone-isopropanol-water and acetone-MEK(methyl ethyl ketone)-water ternary mixtures. The data shows that to obtain a given heat flux, the wall superheat required is greater for mixtures than for the pure components constituting the mixture. The measured heat transfer coefficients were compared with predictions from literature correlations for multicomponent mixtures. In all the cases, overestimation or underestimation of the data was observed. Therefore, a new correlation has been proposed for the heat flux in terms of Archimedes number, Prandtl number, surface–liquid interaction parameter, modified Jakob number, dimensionless surface roughness group, properties-profile parameter and an effective temperature driving force. In general, the effective temperature driving force in binary mixtures is less than that encountered in pure components and is obtained by incorporating the binary diffusivity of the mixture. In multicomponent systems, the multicomponent diffusion coefficients have to be incorporated into the expression for the effective temperature driving force. The heat flux correlation predicts the present experimental data as well as literature data, satisfactorily. The heat flux was found to be a function of the difference between the equilibrium vapour and liquid concentration, (y − x) of the light component(s) and the minimum heat flux occurs at the maximum of (y − x) of the light component(s).

7 citations

Journal ArticleDOI
TL;DR: In this paper, a comprehensive experimental study on the determination of heat transfer coefficients for R-22, R-134a, and the predefined refrigerant blends R-404A and R-407C was performed.

5 citations

References
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Book
01 Jan 1976

9,629 citations

Journal ArticleDOI
L. E. Scriven1
TL;DR: In this paper, the equations governing spherically symmetric phase growth in an infinite medium are first formulated for the general case and then simplified to describe growth controlled by the transport of heat and matter.

832 citations

Journal ArticleDOI
TL;DR: In this article, a regression analysis was applied to the nearly 5000 existing experimental data points for natural convection boiling heat transfer, which can best be represented by subdividing the substances into four groups (water, hydrocarbons, cryogenic fluids and refrigerants) and employing a different set of dimensionless numbers for each group of substances.

710 citations