An analysis of film boiling phenomena of subcooled water spreading radially on a hot steel plate

Kokado, Jun‐ichi; Hatta, Natsuo; Takuda, Hirohiko; Harada, Jun; Yasuhira, Nobuo

doi:10.1002/srin.198405320

Cited by 15 publications

(10 citation statements)

References 5 publications

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“…This is apparent from the large surface temperature fluctuations and was also supported by the visual observations. This is also in agreement with the findings of Ochi et al, 5 Kokado et al 8 and Liu and Wang. 6 The second peak of the boiling curve at locations outside the impingement zone was consistently seen in all tests.…”

Section: Boiling Curvessupporting

confidence: 94%

Experimental study of boiling heat transfer during subcooled water jet impingement on flat steel surface

Hauksson¹,

Fraser²,

Prodanovic³

et al. 2004

Ironmaking & Steelmaking

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The growth in demand for high quality metal alloys has placed considerable emphasis on the type of cooling methods used in manufacturing processes, in particular, the production of highly tailored steel through controlled cooling on the runout table. The present study focuses on the heat transfer (cooling of hot rolled steel strips) on a runout table. The purpose of the study was to develop an efficient experimental method and collect temperature data under conditions similar to those that occur during industrial runout table conditions in a steelmill. Surface and internal temperatures were measured during transient cooling of a flat, upward facing fixed steel plate cooled by a highly subcooled single, circular, free surface jet of water. Measurements were made at stagnation and several streamwise distances from the stagnation point. A numerical, finite difference model was applied to calculate the surface heat flux using measured temperatures. The effect of water flowrate and subcooling on the overall heat transfer with emphasis on the maximum heat flux is discussed.

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Section: Boiling Curvessupporting

confidence: 94%

Experimental study of boiling heat transfer during subcooled water jet impingement on flat steel surface

Hauksson¹,

Fraser²,

Prodanovic³

et al. 2004

Ironmaking & Steelmaking

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“…From the above discussion we may postulate that the maximum water temperature for immediate wetting is around 60°C, which is in good agreement with the theoretical prediction [14] that no film boiling occurs on stagnation point when the water with a temperature of higher than 60°C hits the test plate whose temperature is lower than 900°C, and with the finding reported in reference [15] where such a temperature is 68°C.…”

Section: Effect Of Water Temperaturesupporting

confidence: 85%

“…Now we consider some modifications to Eq. (15). The term aq * (eventually would be a n q in the iterative process) would lead to an increment D 1 q and a better estimation for first value of the first heat flux 1 q.…”

Section: Calculation Of Heat Fluxmentioning

confidence: 98%

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Heat transfer behavior in the impingement zone under circular water jet

Gadala

2006

International Journal of Heat and Mass Transfer

100

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“…Table lists a number of empirical and theoretical correlations that have been proposed for the Leidenfrost point. Ishigai et al, Ochi et al, and Kokado et al developed empirical relationships for the minimum film boiling (MFB) heat fluxes

q_{M F B}^{" "}

(W m −2 ) and Leidenfrost temperatures or the superheat at MFB based on their experimental studies of jet impingement boiling in steady state and/or transient conditions. The proposed correlations depend on the jet diameter

d

, nozzle width

w

, vapor thickness

δ_{v}

, the jet acceleration

γ_{t o t} = g + \frac{V_{j}^{2}}{d}

where g is the gravitational acceleration, the liquid–vapor surface tension

σ

, the liquid–vapor latent heat

h_{l v}

, the jet pressure

P,

and thermo‐physical properties of vapor and liquid.…”

Section: Jet Impingement Boilingmentioning

confidence: 99%

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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An analysis of film boiling phenomena of subcooled water spreading radially on a hot steel plate

Abstract: The film boiling phenomena on a hot steel plate are experimentally and theoretically analyzed in due consideration of the interaction between the cooling water and the plate surface temperatures, when a relatively hot water bar impinges on the plate surface.

Cited by 15 publications

References 5 publications

Experimental study of boiling heat transfer during subcooled water jet impingement on flat steel surface

Experimental study of boiling heat transfer during subcooled water jet impingement on flat steel surface

Heat transfer behavior in the impingement zone under circular water jet

Simulation of Runout Table Cooling

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