Transition Boiling Heat Transfer

Kalinin, E. K.; Berlin, I. I.; Kostiouk, Valeri V.

doi:10.1016/s0065-2717(08)70120-5

Cited by 33 publications

(8 citation statements)

References 19 publications

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“…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) . The weighting coefficients are related to the fraction of liquid–solid contact area.…”

Section: Jet Impingement 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%

“…[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%

Simulation of Runout Table Cooling

Guemo

Prodanovic

Militzer

2018

steel research int.

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“…-CorrelationOn the basis of reports by Berenson (1) and Kalinin et al (2) , we examined the correlations of liquid-solid contact fractions in the transition boiling, Γ, as reported in our previous study (7) . The heat transfer in the wet region is given at the CHF to avoid overestimated heat flux in high superheat: for example, according to Rohsenow's correlation, the boiling heat transfer at a high superheat, ∆T sat = 100 K, is 4.2 × 10 7 W/m 2 .…”

Section: Liquid-solid Contact Fractionmentioning

confidence: 99%

“…For example, Berenson (1) pointed out early through many experiments that transition boiling is a combination of unstable film boiling and unstable nucleate boiling, each of which alternately exists at a given location on a heating surface. Kalinin et al (2) presented a correlation of a liquid-solid contact fraction in transition boiling on the basis of the hypothesis on Ergodic property on liquid-solid contact.…”

Section: Introductionmentioning

confidence: 99%

Derivations of Correlation and Liquid-Solid Contact Model of Transition Boiling Heat Transfer

Ohtake

Koizumi

2006

JSME international journal. Ser. B, Fluids and thermal engineer

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The correlation of liquid-solid contact fraction in transition boiling was derived by focusing on the dimensionless wall temperature θ = (T w − T CHF )/(T MHF − T CHF ). The following correlation was obtained from experimental results for water, R-113 and LN 2 : Γ = 1.000−0.9120θ −0.1343θ 2 , where q tb = q CHF Γ +q MHF (1−Γ). In the present model, considering a pseudo-liquid solid contact right after the detachment of a bubble from a liquid-vapor interface, transient heat conduction was analyzed in it three-dimensionally. Liquid-solid contact time and area were determined by the present correlation of the fractions of liquid-solid contact:5 . The heat transfer during the wet period was estimated using q wet = f (∆T 0.8 sat ). The prediction by the present model was in agreement with the present experimental data for water. Furthermore, a simulation of the rewetting was performed; the experimental results of cooling curves during the rewetting were well reproduced by the transient heat conduction model using the present correlation of transition boiling heat transfer and the present liquid-solid contact model.

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“…film boiling and unstable nucleate boiling alternately existing at any given location on a heating surface. The extracted heat flux in the transition boiling was provided by (Kalinin et al[31]):…”

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confidence: 99%

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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Transition Boiling Heat Transfer

Cited by 33 publications

References 19 publications

Simulation of Runout Table Cooling

Simulation of Runout Table Cooling

Derivations of Correlation and Liquid-Solid Contact Model of Transition Boiling Heat Transfer

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

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