Nucleation Site Activation in Saturated Boiling

Shoukri, M.; Judd, R. L.

doi:10.1115/1.3450296

Cited by 32 publications

(28 citation statements)

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“…Presented conclusions are supported by important experimental data [47] on sizes and distribution of operating natural nucleation sites studied through immediate optical observation of boiling process on heating surfaces with different finish classes (with standard roughness parameter R p from 0.1 to 0.4 μm).…”

Section: A Slope Of Boiling Heat Transfer Curvesupporting

confidence: 55%

“…However, the results of some similar experiments show qualitatively differing trends. In this context it also presents significant interest coincidence of experimental curves on boiling of water on massive copper surface [47] and on thin platinum wire with diameter 0.3 mm [57] at atmospheric pressure.…”

Section: Two Basic Features Of Developed Boiling Heat Transfermentioning

confidence: 99%

“…It may be assessed as fortunate exclusion the work [47] including measurement of sizes and distribution of operating sites.…”

Section: Correlation Of Experimental Datamentioning

confidence: 99%

“…Heat transfer during developed boiling of water at atmospheric pressure on heating surfaces with different finish classes [47] (1 -R p =0.4 μm; 2 -R p =0.125 μm; 3 -R p =0.1 μm).…”

Section: Fig (17)mentioning

confidence: 99%

“…Fortunately, a small number of comprehensive experiments including the values of effective radii covers greatly differing boiling areas and materials of heating surfaces [47,[85][86].…”

Section: Correlation Of Experimental Data On Htc On Heating Surfaces 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: A Slope Of Boiling Heat Transfer Curvesupporting

confidence: 55%

Section: Two Basic Features Of Developed Boiling Heat Transfermentioning

confidence: 99%

“…It may be assessed as fortunate exclusion the work [47] including measurement of sizes and distribution of operating sites.…”

Section: Correlation Of Experimental Datamentioning

confidence: 99%

“…Heat transfer during developed boiling of water at atmospheric pressure on heating surfaces with different finish classes [47] (1 -R p =0.4 μm; 2 -R p =0.125 μm; 3 -R p =0.1 μm).…”

Section: Fig (17)mentioning

confidence: 99%

“…Fortunately, a small number of comprehensive experiments including the values of effective radii covers greatly differing boiling areas and materials of heating surfaces [47,[85][86].…”

Section: Correlation Of Experimental Data On Htc On Heating Surfaces 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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Behavior of nucleation sites in pool boiling

Sgheiza

Myers

1985

AIChE Journal

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The behavior of active boiling site populations was monitored for pool boiling on an electrically heated 1-mil stainless steel sheet. The boiling sites were located using a high-speed infrared camera focused on the underside of the boiling surface. Experiments were conducted to determine factors affecting the origin, concentration, and lifetime of active sites.J. E. SGHEIZA and J. E. MYERS Department of Chemical andNuclear Engineering University of California Santa Barbara, CA 93106 SCOPEMost experimental studies of nucleation sites in pool boiling are limited either to single, artificial sites or to sparsely distributed sites found on surfaces boiling at low heat fluxes. At fluxes of even moderate value the two-phase turbulence in a boiling system prevents direct observation of the behavior of the individual sites. In the investigation reported here real-time detection of the presence of active sites on the upper surface of a heated plate was done using a high-speed infrared camera to scan the temperature field on the underside of the heater.It has been known for over two decades that the nucleation and growth of a bubble in pool boiling causes a rapid drop in the temperature of the heater surface. When the surface is an electrically heated 1-mil sheet of stainless steel, the drop in the temperature on the upper side is transmitted to the underside within a few milliseconds. Thus, the nucleation, growth, and departure of bubbles in the liquid can be followed using an infrared scanning camera to detect the temperature behavior on the underside. This noninvasive technique allows studies to be made of individual sites and whole populations of sites under the influence of such variables as heat flux and the nature of the heating cycle. CONCLUSIONS AND SIGNIFICANCETransient and permanent boiling sites were identified and counted with a high-speed infrared camera during saturated pool boiling of water and four organic liquids on a horizontal heated surface at one atmosphere, at heat fluxes between 6.0 and 30.0 W/cm2. The behavior of active boiling site populations was monitored with the infrared camera during steady and pulsed boiling tests. Infrared camera displays of boiling site activity were recorded on 16 mm film at 60 pictures/s. Frameby-frame analysis of these films produced counts of active sites and the number of movie frames showing active boiling during two-second intervals. From these counts the average lifetime per site and the fluctuation in average lifetimes was determined. Temperature profiles of several active sites were photographed from the IR camera displays at 1,000 pictures/s, and the fluctuation in bubble nucleation periods analyzed.Pulsed boiling tests with water indicated that at heat fluxes up to 17 W/cm2 only 50 to 60% of potentially active sites nucleated and that less than 30% of all active sites nucleated consistently. Site-lifetime results showed that some sites, referred to as transient sites, nucleated in a highly irregular manner with vigorously active periods alternating with periods...

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Das Verschleißverhalten von alitiertem Stahl bei Trockenreibung

Yoshida¹,

Takeuchi²

1981

Steel Research Intl

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Untersuchung einer alitierten Stiftprobe und einer Scheibe aus dem Stahl Ck 45 mit mittlerem Kohlenstoffgehalt als Verschleißprobenpaar bei Trockenreibung. Einfluß von Normalspannung, Gleitgeschwindigkeit und Verschleißweg auf den Verschleiß. Analyse der Verschleißflächen mit der Mikrosonde und dem Raster‐Elektronenmikroskop (SEM) zur Klärung der Verschleißmechanismen. Maximaler Verschleißabrieb bei einer Verschleißgeschwindigkeit von 0,7 m/s aufgrund von Adhäsion und Furchenbildung. Verschleißversuch nach der Mikrosondenanalyse innerhalb der Legierungsschicht.

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Nucleation Site Activation in Saturated Boiling

Cited by 32 publications

References 0 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

Behavior of nucleation sites in pool boiling

Das Verschleißverhalten von alitiertem Stahl bei Trockenreibung

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