Leidenfrost temperature on an extremely smooth surface

Nagai, Niro; Nishio, S.

doi:10.1016/0894-1777(95)00129-8

Cited by 56 publications

(15 citation statements)

References 8 publications

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“…The heat transfer mechanisms in transition boiling have not yet been well understood. In the pool boiling literature, transition boiling is considered as the combination of nucleate and film boiling . From this definition, the pool transition boiling is modeled as a weighted sum of critical heat flux and MFB heat flux (Leidenfrost) .…”

Section: Jet Impingement Boilingmentioning

confidence: 99%

“…In the pool boiling literature, transition boiling is considered as the combination of nucleate and film boiling. [69] From this definition, the pool transition boiling is modeled as a weighted sum of critical heat flux and MFB heat flux (Leidenfrost). [69][70][71][72] The weighting coefficients are related to the fraction of liquid-solid contact area.…”

Section: Transition Boilingmentioning

confidence: 99%

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Simulation of Runout Table Cooling

Guemo

Prodanovic

Militzer

2018

steel research int.

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Accelerated cooling on the runout table of hot mills has become a key technology to produce thermo‐mechanically controlled processed (TMCP) steel plates and strips. During runout table cooling austenite decomposition takes place and determines the final microstructure and, hence, the properties of the hot‐rolled steel. There is an increased tendency to produce higher strength TMCP steels with complex microstructures including bainite and martensite. To tailor these microstructures, it is required to carefully design runout table cooling paths and lower the cooling stop and coiling temperature, respectively, for producing flat products with homogeneous mechanical properties. Thus, simulation of runout table cooling is a crucial aspect of process modeling. In the present paper, the status of runout table simulation approaches is reviewed. In particular, the three boiling mechanisms of water cooling, that is, nucleate, transition, and film boiling are discussed. The development of appropriate heat transfer coefficients is rather mature for nucleate and film boiling, respectively. Modeling and controlling the transition boiling regime below the Leidenfrost temperature remains a challenge as heat extraction rates increase with decreasing steel temperature. The status of heat transfer simulations for transition boiling is thus discussed in detail. Currently, the proposed heat transfer correlations, while increasingly based on the underlying physics, still contain a number of empirical parameters that require tuning with experimental and/or mill data. The review is limited to information in the open literature while recognizing that a number of proprietary in‐house runout table cooling models exist that are developed either by equipment makers or steel companies to control accelerated cooling to lower cooling stop or coiling temperatures.

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Section: Jet Impingement Boilingmentioning

confidence: 99%

Section: Transition Boilingmentioning

confidence: 99%

Simulation of Runout Table Cooling

Guemo

Prodanovic

Militzer

2018

steel research int.

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“…Inada and Yang (1993) investigated the mechanism of miniaturizing 4.0-mm-diameter water droplets impacting onto a hot platinum surface at 160-420°C. Nagai and Nishio (1996) used a flash photography method to observe the dynamic behavior of the contact between water droplets and a sapphire surface heated above the Leidenfrost temperature. Chaves et al (1999) studied the bubble formation inside 1.8-mm-diameter ethanol droplets on a hot aluminum surface by using CCD camera photography and concluded that the growth rate of vapor bubbles is independent of the Weber number, but is dependent on the wall temperature.…”

Section: Literature Surveymentioning

confidence: 99%

Hydrodynamics and boiling phenomena of water droplets impinging on hot solid

Fujimoto

Oku

Ogihara

et al. 2010

International Journal of Multiphase Flow

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a b s t r a c tThe collision of single water droplets with a hot Inconel 625 alloy surface was investigated by a two-directional flash photography technique using two digital still cameras and three flash units. The experiments were conducted under the following conditions: the pre-impact diameters of the droplets ranged from 0.53 to 0.60 mm, the impact velocities ranged from 1.7 m/s to 4.1 m/s, and the solid surface temperatures ranged from 170°C to 500°C. When a droplet impacted onto the solid at a temperature of 170°C, weak boiling was observed at the liquid/solid interface. At temperatures of 200 or 300°C, numerous vapor bubbles were formed. Numerous secondary droplets then jetted upward from the deforming droplet due to the blowout of the vapor bubbles into the atmosphere. No secondary droplets were observed for a surface temperature of 500°C at the low-impact Weber numbers ($30) associated with the impact inertia of the droplets. Experiments using 2.5-mm-diameter droplets were also conducted. The dimensionless collision behaviors of large and small droplets were compared under the same Weber number conditions. At temperatures of less than or equal to 300°C, the blowout of vapor bubbles occurred at early stages for a large droplet. At a surface temperature of 500°C, the two dimensionless deformation behaviors of the droplets were very similar to each other.

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“…In such case, the Leidenfrost transition becomes independent of the impact velocity, signalling another separating mechanism instead of the one based on the gas/vapor flows. As a result, these theories cannot be used to reveal the mechanism of the Lei- Snapshots showing the wetted area, measured by the total internal reflection (TIR) technique [11][12][13][14], of (a) the boiling process and (b) the rewetting process for acetone droplets with velocity V0 = 2.7 m · s −1 and surface tempera- denfrost transition. The goal of this paper is to elucidate the Leidenfrost transition experimentally and theoretically.…”

mentioning

confidence: 99%

Universality of oscillating boiling in Leidenfrost transition

Khavari

Tran

2017

Phys. Rev. E

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The Leidenfrost transition leads a boiling system to the boiling crisis, a state in which the liquid loses contact with the heated surface due to excessive vapor generation. Here, using experiments of liquid droplets boiling on a heated surface, we report a phenomenon, termed oscillating boiling, at the Leidenfrost transition. We show that oscillating boiling results from the competition between two effects: separation of liquid from the heated surface due to localized boiling and rewetting. We argue theoretically that the Leidenfrost transition can be predicted based on its link with the oscillating boiling phenomenon and verify the prediction experimentally for various liquids.

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Leidenfrost temperature on an extremely smooth surface

Cited by 56 publications

References 8 publications

Simulation of Runout Table Cooling

Simulation of Runout Table Cooling

Hydrodynamics and boiling phenomena of water droplets impinging on hot solid

Universality of oscillating boiling in Leidenfrost transition

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