A Comprehensive Model for Nucleate Pool Boiling Heat Transfer Including Microlayer Evaporation

Judd, R. L.; Hwang, K. S.

doi:10.1115/1.3450610

Cited by 262 publications

(78 citation statements)

References 12 publications

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“…The same conclusion follows from analysis [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] showing much greater role of the pressure gradient caused by momentum transport by evaporation in comparison with thermocapillarity.…”

Section: Pegb (supporting

confidence: 73%

“…As during boiling of water at atmospheric pressure typical values of q r /q are much less 0.2 [6,[15][16][17], boiling HTC turns out to be 4-5 times higher than the same parameter in corresponding bubbling regime.…”

Section: Fig (6)mentioning

confidence: 99%

“…According these results fundamental evidences of dominant role of liquid phase convection in boiling heat transfer [6,[15][16][17] remain in force regarding to local temperature pulsations as well.…”

Section: Fig (2)mentioning

confidence: 99%

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Boiling Heat Transfer: Mechanisms, Models, Correlations and the Lines of Further Research

Shekriladze¹

2008

TOMEJ

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A review discusses current status of boiling heat transfer research. Basic experimental facts, physical models and correlations of experimental data on heat transfer coefficient (HTC) are reconsidered. Principal restrictions of traditional model of "the theatre of actors" (MTA) are demonstrated. Basic role of control of HTC by thermodynamic conditions on nucleation sites is demonstrated and consequent model of "the theatre of director" (MTD) is discussed. Universal MTD-based correlation of boiling HTC of all types of liquids is presented. Unified consistent research framework for developed boiling heat transfer and diverse specific boiling heat transfer regimes is outlined through supplementing MTD by so-called multifactoring concept (MFC). MFC links transition from developed boiling mode to diverse boiling curves to a phenomenon of multiplication of factors influencing HTC. Multifactoring phenomenon equally can cover any boiling process including boiling in minichannels and microchannels. Possible types of multifactoring are considered. Finally, the ways of further research of the boiling problem are discussed.

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Section: Pegb (supporting

confidence: 73%

Section: Fig (6)mentioning

confidence: 99%

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Boiling Heat Transfer: Mechanisms, Models, Correlations and the Lines of Further Research

Shekriladze¹

2008

TOMEJ

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“…The mechanistic models of nucleate boiling (Judd and Hwang, 1976;Benjamin and Balakrishnan, 1996) assume the additive mechanism of heat transfer comprising transient heat conduction, microlayer evaporation and turbulent natural convection in the area outside the influence of the bubbles. Each mentioned mode of heat transfer is affected by thermal conductivity of the boiling liquid, so the enhanced thermal conductivity of the nanofluids becomes a significant effect that augments the heat transfer performance.…”

Section: Discussion Of the Resultsmentioning

confidence: 99%

The effect of pressure on heat transfer during pool boiling of water-Al2O3 and water-Cu nanofluids on stainless steel smooth tube

Cieśliński¹,

Kaczmarczyk²

2011

Chemical and Process Engineering

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Experimental investigation of heat transfer during pool boiling of two nanofluids, i.e. water-Al 2 O 3 and water-Cu has been carried out. Nanoparticles were tested at the concentration of 0.01%, 0.1%, and 1% by weight. The horizontal smooth stainless steel tubes having 10 mm OD and 0.6 mm wall thickness formed the test heater. The experiments have been performed to establish the influence of nanofluids concentration on heat transfer characteristics during boiling at different absolute operating pressure values, i.e. 200 kPa, ca. 100 kPa (atmospheric pressure) and 10 kPa. It was established that independent of nanoparticle materials (Al 2 O 3 and Cu) and their concentration, an increase of operating pressure enhances heat transfer. Generally, independent of operating pressure, sub-and atmospheric pressure, and overpressure, an increase of nanoparticle concentration caused heat transfer augmentation.

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“…Yang et al [7] achieved relatively good agreement between their simple fractal surface characterization and observed nucleation site densities in pool boiling of water on a stainless steel surface. Yu and Cheng [8] utilized nucleation site densities and bubble departure diameters predicted by fractal theory along with models for individual heat transfer mechanisms [9][10][11][12][13][14] to reproduce the experimentally observed boiling curves of Wang and Dhir [15] with good accuracy. Most recently, Sathyamurthi et al [16] noted a similarity between the boiling curve and fractal dimensionality of the void fraction in contact with the surface in pool boiling.…”

mentioning

confidence: 99%

Nucleate boiling from smooth and rough surfaces – Part 2: Analysis of surface roughness effects on nucleate boiling

McHale

Garimella

2013

Experimental Thermal and Fluid Science

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The effect of surface roughness on nucleate boiling heat transfer is not clearly understood.This study is devised to conduct detailed heat transfer and bubble measurements during boiling on a heater surface with controlled roughness. This second of two companion papers presents an analysis of heat transfer and bubble ebullition in nucleate boiling with new measures of surface roughness: area ratio, surface mean normal angle, and maximum idealized surface on the boiling curves and bubble behaviors suggests that the relative "roughness" of a surface should be quantified in a manner different from existing approaches to date in the literature.Several recent studies have reported attempts to develop surface characterization methods that relate more directly to boiling physics. Qi et al.[2] applied a digital "filtering" operation on 2-D surface scan data to examine potential nucleation sites in terms of cavity mouth radius and cone angle. They did not elaborate on the details of the algorithm; predictions of nucleation site density based on their analysis produced mixed results. ANALYSIS OF SURFACE ROUGHNESSIn the companion paper to this work [1], six borosilicate glass substrates were roughened by abrading with diamond compound to impart microscopic-scale roughness features, then annealed to control roughness characteristics at the nanoscale. One substrate (test piece 1) was not abraded or annealed. All seven substrates were coated conformally with an electrically conductive ITO layer, from which a 400 µm wide × 25 mm long heater/sensor device was patterned on each substrate. Each test piece was fixed at the base of a thermally controlled chamber that allowed saturated nucleate boiling heat transfer to be measured while recording 5 high-speed videographic visualizations from beneath the test surface and from the side simultaneously.Test pieces 4, 6, and 7 were abraded with the same diamond compound such that R a values (and therefore microscopic-scale roughness features) would be similar. These three surfaces, however, were exposed to different annealing conditions of temperature and soak period as shown in Table 1 [1] such that the roughness characteristics at the nanoscale are very different.Boiling performance for the three surfaces differed as described in and is valid for contact angles up to roughly 150°. The Fritz departure diameter meets the criteria above, including fluid properties and wetting characteristic. Filtered vertical roughness parametersAfter the filtering operation, new values of R a for the test substrates were calculated by the method described in [1], and are listed in Table 2. For each surface, there was little to no difference between the values calculated for different interrogation window sizes; the lowest values are reported here. After the filtering operation, the average roughness values of surfaces 6 and 7 (abraded with 100-µm particles and annealed more aggressively) fell below that of surface 3 (abraded with 30-µm particles). Indeed, surface 7 appears to be similar in roug...

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A Comprehensive Model for Nucleate Pool Boiling Heat Transfer Including Microlayer Evaporation

Cited by 262 publications

References 12 publications

Boiling Heat Transfer: Mechanisms, Models, Correlations and the Lines of Further Research

Boiling Heat Transfer: Mechanisms, Models, Correlations and the Lines of Further Research

The effect of pressure on heat transfer during pool boiling of water-Al2O3 and water-Cu nanofluids on stainless steel smooth tube

Nucleate boiling from smooth and rough surfaces – Part 2: Analysis of surface roughness effects on nucleate boiling

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