State of the art in pool boiling heat transfer of new refrigerants

Gorenflo, Dieter

doi:10.1016/s0140-7007(00)00046-3

Cited by 40 publications

(23 citation statements)

References 10 publications

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“…In the nucleate boiling regime, the influence of heat flux is stronger and a straight line could be fitted through the data points in the double logarithmic plot. The experimental data are compared with the prediction from correlation suggested by Gorenflo (2001). Figure 3 shows that the experimental results are in good agreement with the values predicted by this correlation.…”

Section: Results For Distilled Watersupporting

confidence: 64%

“…b) Boiling heat transfer coefficient had been investigated by several investigators over a wide range of heat fluxes and system pressures with the highly accurate Gorenflo Standard Pool Boiling Apparatus (Gorenflo, 2001). All these researches agree that the Gorenflo correlation predicts the nucleate pool boiling heat transfer coefficient of distilled water with an absolute, mean and average error of less than 6%.…”

Section: Results For Distilled Watermentioning

confidence: 87%

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Experimental and theoretical study of pool boiling heat transfer to amine solutions

Peyghambarzadeh

Jamialahmadi

Fazel

et al. 2009

Braz. J. Chem. Eng.

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Abstract-In this investigation, a large number of experiments have been performed to measure the nucleate boiling heat transfer coefficients of water/diethanolamine (DEA) and water/monoethanolamine (MEA) binary solutions. Based on these experimental data, effects of physical properties such as surface tension and viscosity of mixtures on nucleate boiling heat transfer coefficients and also on bubble dynamics have been discussed. Meanwhile, some photographs have also been selected which illustrate the behaviours of bubbles near the heat transfer surface. In this article, a new correlation has been developed on the basis of the correlation of Stephan and Körner which is known as a successful correlation for the prediction of nucleate boiling heat transfer coefficients of mixtures. Comparison of the prediction of this new correlation with experimental data indicates that this modification can significantly improve the performance of the Stephan and Körner correlation.

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Section: Results For Distilled Watersupporting

confidence: 64%

Section: Results For Distilled Watermentioning

confidence: 87%

Experimental and theoretical study of pool boiling heat transfer to amine solutions

Peyghambarzadeh

Jamialahmadi

Fazel

et al. 2009

Braz. J. Chem. Eng.

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“…Several refrigerants have been tested including such hydrocarbons as propane and butane. The results of the investigation have been published in several papers; two of them will be referred to here [24,25], along with two by Luke [26,27]. As expected, their results have shown that the heat transfer coefficient increases with the surface roughness.…”

Section: Literature Surveymentioning

confidence: 64%

“…Large values of Ra have been used to explore the effect of roughness on nucleate boiling heat transfer. The microstructure of the heating surface was evaluated in terms of the two-dimensional profile, the probability distribution density of the profile and its spectrum for average roughness up to 3.30 μm [24]. Microstructure characteristics of the rougher surfaces (Ra=4.6 μm and 10.5 μm) was not determined.…”

Section: Experimental Results and Analysismentioning

confidence: 99%

An Overview of Surface Roughness Effects on Nucleate Boiling Heat Transfer~!2009-10-31~!2010-01-01~!2010-04-16~!

Jabardo¹

2010

TOTPJ

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Abstract:The paper aims at an overview of heating surface microstructure effects on nucleate boiling heat transfer. A comprehensive chronological literature survey is presented followed by an analysis of the results of an experimental investigation. Boiling data of refrigerants R-134a and R-123 on 19 mm diameter copper and brass tubes of average surface roughness varying from 0.07 μm to 10.5 μm have been gathered under the present investigation. Though most of the data confirm previous literature trends, according to which the heat transfer coefficient increases with surface roughness, very rough surfaces present a peculiar behavior with respect to that of the smoother surfaces (Ra<3.0 μm). Heat transfer performance of very rough surfaces is superior to the smoother ones at low heat fluxes (q<20 kW/m 2 ). However, decay in their thermal performance is observed in the high heat fluxes range. An in depth analysis of the effect of roughness on the slope, "m" of the h vs q curves has been performed with a general conclusion being that "m" is affected not only by de pressure but also by the surface roughness. Finally, an analysis of the active cavities density is performed using some models from the literature in order to evaluate the effect of surface roughness in cavity activation. The obtained results are generally inconclusive. However, it has been determined that surface microstructure effects must not be neglected in future models.

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“…As aforementioned and despite the big advances in recent years, no strong theoretical and global mechanistic model has been developed yet [5,6]. As noted by several authors [5,8] due to the vague knowledge of bubble formation at macro and microstructure levels, many of the past and recent predictive methods in practice are based on empirical and semi-empirical models.…”

Section: Introductionmentioning

confidence: 99%

On the effect of surface roughness and material on the subcooled flow boiling of water: Experimental study and global correlation

Paz

Conde

Suárez

et al. 2015

Experimental Thermal and Fluid Science

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.On the effect of surface roughness and material on the subcooled flow boiling of water: Experimental study and global correlation. AbstractIn this paper, a new correlation based on experimental results for subcooled flow boiling of water at low pressure is proposed, preceded by a brief review on how the solid-fluid interaction has been dealt with in past correlations. The experimental sample comprises seven heating surfaces of different material (copper, aluminium and stainless steel) and roughness. The experimental facility is presented in detail and the surface morphology of each test specimen is analysed by means of an optical interferometer. The correlation is based on the assumption that the effect of material and roughness can be captured by means of modifiers of a general expression. The surfaces chosen in this work were selected to capture a broad range of industrial applications, and, though the correlation found fits well in the range of commercial and relatively high values of R a (up to 7 µm in the case of copper), further study is needed for larger values, as a discontinuity in the effect was observed, which has been previously determined by some authors. Thus, the proposed global correlation permits the calculation of the boiling heat flux taking into account, in addition to the more classical parameters such as pressure and bulk temperature, the effect of both the roughness and material of the wall heater, allowing its general use in low pressure applications such as those commonly found in the automotive industry.

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State of the art in pool boiling heat transfer of new refrigerants

Cited by 40 publications

References 10 publications

Experimental and theoretical study of pool boiling heat transfer to amine solutions

Experimental and theoretical study of pool boiling heat transfer to amine solutions

An Overview of Surface Roughness Effects on Nucleate Boiling Heat Transfer~!2009-10-31~!2010-01-01~!2010-04-16~!

On the effect of surface roughness and material on the subcooled flow boiling of water: Experimental study and global correlation

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