Premature transition to stable film boiling initiated by power transients in liquid nitrogen

Sinha, Dipen N.; Brodie, L. C.; Semura, J. S.; Young, F. M.

doi:10.1016/0011-2275(79)90023-7

Cited by 32 publications

(16 citation statements)

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“…The self-sustained evaporation effect at liquid boiling under stepwise heat generation in nitrogen and R-113 was observed in [40][41][42][43][44][45][46]. Analyzing the video photograms of the evaporation front propagation process at nonstationary heat generation, which was described in those works, we see that depending on the parameters, the liquid-vapor interphase surface can be sufficiently smooth ("vapor jacket propagation," according to Tsukamoto [42,43,45,46]) or substantially deformed, i.e., rough (like a corn, with surface roughness [43]).…”

Section: Introductionmentioning

confidence: 99%

“…For instance, according to the estimate in the investigated range of the parameters of heat flux density, pressure, and temperature difference of boiling, the heat layer thickness near the heat-releasing surface varies in the range of 0.06 to 0.5 mm. As it follows from the video photograms of propagation of the self-sustained evaporation front in different liquids (nitrogen, organic liquids, water, Freon), according to data of [39][40][41][42][43], the characteristic lateral size either also changes within this range, or even exceeds it.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of transient processes at liquid boiling under nonstationary heat generation conditions

Павленко

Tairov

Жуков

et al. 2011

J. Engin. Thermophys.

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The paper presents results on experimentally investigated dynamics of boiling development and formation of film boiling zones under stepwise heat generation on a horizontally and vertically oriented cylindrical surface in a large volume of Freon-21. Experimental data on the expectation time and boiling temperature, the propagation velocity and structure of evaporation and boiling fronts for different heat flux density both in saturated liquid and in subcooling conditions are obtained. Results of experiments on investigating the nucleation forms under development of nonstationary heat release crisis caused by heat loading on the vertical heater immersed into the volume of liquid (water, ethanol) subcooled to saturation temperature are presented. A calculation ratio for determining the expectation time to the beginning of intense vaporization in water is proposed and compared with experimental data obtained on surfaces with different-size roughness. Peculiarities of evolution of evaporation fronts from incipient bubbles are investigated in the experiments with ethanol. Data on the evaporation front velocity as a function of wall overheating are obtained. The obtained experimental data on the propagation velocity of self-sustained evaporation fronts are compared with the known calculated data.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigation of transient processes at liquid boiling under nonstationary heat generation conditions

Павленко

Tairov

Жуков

et al. 2011

J. Engin. Thermophys.

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“…The goal of this study is to fill the void in data for transient heat transfer in liquid hydrogen. The experimental technique has been previously used in liquid helium [1,2,3] and liquid nitrogen [1,4,5] and uses stepped inputs of power to submerged heaters. The duration of the input ranges from 10 -5 to 10 s, with the onset of nucleate boiling occurring in times on the order of 10' 3 s. The surface temperature is monitored through out the period of application of power.…”

Section: Introductionmentioning

confidence: 99%

Transient hydrogen heat transfer- final report for April 1986-April 1989

Louie¹,

Steward²

1991

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Comparison of experimental data for unsupported Pt ribbon to computation with temperature dependent solid and liquid properties and the time dependent power for power input of 7 W/cm 2 20 16. Comparison of experimental data for unsupported Pt ribbon to computation with temperature dependent solid and liquid properties and the time dependent power for power input of 9 W/cm 2 20 iv Transient Hydrogen Heat Transfer

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“…It has been shown that these values can vary depending on the way in which heat is applied to the liquids. Specifically , for abrupt step increases of applied power , the maximum allowed power before film boiling occurs can be as little as 40용 。 f the maximum peak steady state nucleate boiling heat flux [6]. (Film boiling is a form of boiling heat transfer in which an insulating vapor film is formed between the heater surface and the liquid.)…”

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confidence: 99%

“…For example , transient heating may induce film boiling thus preventing efficient cooling of the device and result in burnout of expensive or critical components of a system. Previous work by Sinha et al indicates that the reason for its occurrence is the lack 。 f a well developed natural convection current [6]. The driving force for natural convection is the heat input itself.…”

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confidence: 99%

Nucleation and Heat Transfer in Liquid Nitrogen

Roth¹

2000

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with the advent of the new" high Tc superconductors as well as the increasing use of cryo-cooled conventional electronics , liquid nitrogen will be one of the preferred 2 cryogens used to cool these materials. Consequently , a more thorough understanding of the heat transfer characteristics of liquid nitrogen is required.In how the boiling system variables evolve and fluctuate over time , it is hoped that physical insight and predictive information can be gained. One goal is to discover some indicator or signature in the data that anticipates the transition from nucleate boiling to film/boiling. Some of the important variables that make up the boiling system are the temperature of the heater and the heat flux through the heater surface into the liquid nitrogen. Results , gained by plotting the system's trajectory in the heat flux-temperature plane , is that on average the system follows a counterclockwise trajectory. A physical model is constructed that explains this behavior. Also , as the applied heater power approaches levels at which the transition to film is known to occur , the Arakelyan for their skills in machining and constructing the mechanical devices.

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Premature transition to stable film boiling initiated by power transients in liquid nitrogen

Cited by 32 publications

References 4 publications

Investigation of transient processes at liquid boiling under nonstationary heat generation conditions

Investigation of transient processes at liquid boiling under nonstationary heat generation conditions

Transient hydrogen heat transfer- final report for April 1986-April 1989

Nucleation and Heat Transfer in Liquid Nitrogen

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