Predictable modelling for cooling process of a hot steel plate by a laminar water bar

Hatta, Natsuo; Kokado, Jun‐ichi; Takuda, Hirohiko; Harada, Jun; Hiraku, Keizo

doi:10.1002/srin.198405326

Cited by 11 publications

(8 citation statements)

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“…The correlation proposed for ferrous surface by Hatta et al, is valid for convective heat transfer coefficient associated with film boiling in the downstream parallel flow region (Equation ).

h_{F B} = 200 - true(2420 - 21.7 T_{L} true) Δ {T_{s a t}}^{- 0.8}

…”

Section: Boiling Regime During Transient Coolingmentioning

confidence: 99%

Surface Quenching by Jet Impingement − A Review

Agrawal

2018

steel research int.

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Heat transfer performance with jet impingement quenching of ferrous and non ferrous surface are reviewed for transient cooling condition. The surface rewetting performance during quenching is critically reviewed for various rewetting parameters viz. rewetting temperature, wetting delay, maximum surface heat flux, and rewetting velocity. These rewetting parameters are further assessed for the parameters pertaining to hot surface and coolant. Various published correlations for all the mode of boiling heat transfer and rewetting parameters are also encapsulated in the present review work.

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“…The correlation proposed for ferrous surface by Hatta et al, is valid for convective heat transfer coefficient associated with film boiling in the downstream parallel flow region (Equation ).

h_{F B} = 200 - true(2420 - 21.7 T_{L} true) Δ {T_{s a t}}^{- 0.8}

…”

Section: Boiling Regime During Transient Coolingmentioning

confidence: 99%

Surface Quenching by Jet Impingement − A Review

Agrawal

2018

steel research int.

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“…Surface velocity is a very sensitive parameter for CHF. 4. Finally, we conclude that further experiments are needed to explain the collapse of the shoulder of flux and to predict the rewetting (T MFB ) of the surface for high superheats.…”

Section: Discussionmentioning

confidence: 77%

“…Hatta et al [26] proposed the following correlation fitting the experimental data of Kokado et al [27] obtained for a transient cooling.…”

Section: Parallel Flow Zonementioning

confidence: 99%

“…In the steel industry, cooling on the Run Out Table (ROT) after hot rolling is one of the most difficult process steps in the hot mill strip. The decrease in the temperature needs to be perfectly controlled because the mechanical properties of steel alloys are conditioned by the cooling rate ensured by these jets [1][2][3][4]. Generally, top cooling is carried out using a number of subcooled water jets which impinge perpendicularly on the hot steel surface while bottom cooling is done using sprays.…”

Section: Introductionmentioning

confidence: 99%

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Heat transfer from a hot moving cylinder impinged by a planar subcooled water jet

Gradeck

Kouachi

Borean³

et al. 2011

International Journal of Heat and Mass Transfer

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A hot moving (rotating) cylinder was heated up to 500-600°C and then was cooled by a planar water jet impinging on a line parallel to the symmetry axis. The time dependent wall temperature was measured using embedded thermocouples and the corresponding wall heat fluxes were estimated through an inverse conduction method. In a recent paper, we showed that cooling rates depend on the subcooled temperature of the jet, the velocity of the jet and the surface-to-jet velocity ratio. Since the initial temperature of the cylinder was higher than the Leidenfrost temperature, we observed all the boiling regimes from film boiling to nucleate boiling. The objectives of this paper are firstly to describe the current conditions which exist in the Run Out Table in hot rolling mills, secondly to review the main experimental studies dedicated to jet cooling which have led to modelling heat transfer in boiling conditions and finally to propose new correlations taking into account the velocity of the wall.

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“…The cooling curves calculated by the numerical model similar to Ref. 8) have been comparedwith the experimental ones and discussed from a numerical point of' view.…”

Section: Introductionmentioning

confidence: 99%