Subcooled water jet quenching phenomena for a high temperature rotating cylinder

Mozumder, Aloke Kumar; Mitsutake, Yuichi; Monde, Masanori

doi:10.1016/j.ijheatmasstransfer.2013.09.059

Cited by 36 publications

(20 citation statements)

References 29 publications

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“…Meanwhile, a number of cooling experiments with moving hot surfaces have been reported that are generally conducted on either a horizontal plate or a rotating cylinder . These tests confirm the decrease of heat fluxes with increasing velocity of the plate . There are, however, also changes in the water flow pattern on moving surfaces as compared to stationary surfaces.…”

Section: Jet Impingement Boilingmentioning

confidence: 79%

“…[74,[91][92][93] These tests confirm the decrease of heat fluxes with increasing velocity of the plate. [74,92,94] There are, however, also changes in the water flow pattern on moving surfaces as compared to stationary surfaces. For example, the movement of the plate stretches the flow pattern in the downstream region and enhances the heat transfer in these regions.…”

Section: Moving Platesmentioning

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: 79%

Section: Moving Platesmentioning

confidence: 99%

Simulation of Runout Table Cooling

Guemo

Prodanovic

Militzer

2018

steel research int.

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“…Further, Gradeck et al 2,3) studied quenching of a hot rotating cylinder with an initial temperature of 500-600°C by a subcooled water jet. Recently, Mozumder et al 4) conducted experiments for investigating the quenching phenomena of a water jet impacting on a rotating cylinder at an initial temperature of 460-560°C. Vakili and Gadala 5) investigated the boiling heat transfer of multiple water jets impinging on a hot moving plate.…”

Section: Introductionmentioning

confidence: 99%

Heat Transfer Characteristics of a Pipe-laminar Jet Impinging on a Moving Hot Solid

et al. 2015

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This study experimentally investigated the hydrodynamics and heat transfer characteristics of a circular water jet impinging on a moving hot metal sheet as fundamental research on pipe-laminar cooling. The circular jet was issued from a 5-mm-diameter pipe nozzle. A 0.3-mm-thick sheet made of stainless steel was adopted as the test sheet. In the experiment, the liquid flow formed by the jet impingement was observed by flash photography, and the temperature profile on the underside of the moving sheet was measured by infrared thermography. The initial temperature of the moving solid was varied from 100°C to 500°C. The mean velocity at the nozzle exit ranged between 0.4 m/s and 1.2 m/s. The moving velocity of the solid was set to less than or equal to 1.5 m/s. The estimated heat flux profile on the cooled surface was found to be strongly dependent on the initial temperature of the sheet. When the initial temperature of the sheet was relatively low, a bow-shaped high heat flux region appeared in the upstream of the jet impact point. At higher temperatures, the heat flux area existed only in the jet impact regions. The heat flux increased with increasing initial sheet temperature, reached peak values, and then decreased drastically. The sharp decrease in the heat flux, which was due to the formation of a vapor layer, was influenced by the jet velocity and/or the sheet velocity.

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“…Some research groups have studied the quenching process of a hot rotating metal cylinder through the impingement of a subcooled planar water jet 17,18) and a circular water jet. 19,20) In the experiments, jet impingement on a moving solid occurred once per rotation of the cylinder in order to implement a multi-jet impact test. The research showed that the temperature of solid sharply decreases in the jet impact regions and some heat recovery occurs in other regions due to heat conduction in the solid.…”

Section: Boiling Heat Transfer Characteristics Of Vertical Water Jet mentioning

confidence: 99%

Boiling Heat Transfer Characteristics of Vertical Water Jet Impinging on Horizontally Moving Hot Plate

et al. 2018

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Subcooled water jet quenching phenomena for a high temperature rotating cylinder

Cited by 36 publications

References 29 publications

Simulation of Runout Table Cooling

Simulation of Runout Table Cooling

Heat Transfer Characteristics of a Pipe-laminar Jet Impinging on a Moving Hot Solid

Boiling Heat Transfer Characteristics of Vertical Water Jet Impinging on Horizontally Moving Hot Plate

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