Water Cooling in Direct Chill Casting: Part 1, Boiling Theory and Control

Grandfield, John; Hoadley, Andrew; Instone, Stephen

doi:10.1002/9781118647783.ch85

Cited by 6 publications

(5 citation statements)

References 6 publications

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“…In the modeling of heat transfer, the Alsim casting model was used with boundary conditions as presented by D Mortensen [9] . Lately, also J Grandfield has given a good review of heat transfer formulas used here [10] . The principal outlines can be illustrated in Figures 1-2, giving heat flux as a function of ingot surface temperatures and cooling water temperatures.…”

Section: Heat Transfer Modellingmentioning

confidence: 99%

“…As indicated by Maenner [12] and others [10] , it was useful and even necessary to differentiate clearly between (i) heat transfer in the impingement zone, with a potential for an extra heat transfer effect in addition to the heat transfer further down the ingot, re: the upper lines Figures 1 -2 and (ii) heat transfer in the streaming water zone below the impingement with lower heat transfer, re: the lower lines.…”

Section: Figure 1b Heat Transfer For High Amounts Of Cold Water 1 °Cmentioning

confidence: 99%

See 1 more Smart Citation

Advances for DC Ingot Casting: Part 2 ‐ Heat Transfer and Casting Results

Grealy¹,

Davis²,

Jensen³

et al. 2013

Essential Readings in Light Metals

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The continual drive for improvements and advancements in the field of DC sheet ingot casting, and the introduction of casting technologies that provide the user with greater degrees of control over a number of operational parameters, emphasises the need for more in-depth understanding of many related casting fundamentals. This paper will present a study of a number of these fundamentals in two parts. Part 1 will include the influence of metal distribution, while Part 2 will present heat transfer and the resulting solidification behaviour. The results of physical and mathematical modelling and experimental casting trials will be discussed.

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Section: Heat Transfer Modellingmentioning

confidence: 99%

Section: Figure 1b Heat Transfer For High Amounts Of Cold Water 1 °Cmentioning

confidence: 99%

Advances for DC Ingot Casting: Part 2 ‐ Heat Transfer and Casting Results

Grealy¹,

Davis²,

Jensen³

et al. 2013

Essential Readings in Light Metals

View full text Add to dashboard Cite

show abstract

“…Numerical simulation is a low-cost and efficient method to deeply study and understand the matching degree between the cooling conditions and the casting process, and it is also an effective means to optimize the casting process. Features of interest in DC casting, such as the occurrence of cracks, the ingot shape and dimensions, microstructural refinement, macrosegregation, and the surface condition, all depend on the temperature distribution during the casting [9]. The accurate interfacial heat transfer coefficient (HTC) is an important basis for the simulation results to reflect the solidification physical field.…”

Section: Introductionmentioning

confidence: 99%

Determination of Secondary Cooling Zone Heat Transfer Coefficient with Different Alloy Types and Roughness in DC Casting by Inverse Heat Conduction Method

Jia

Chen

et al. 2022

Crystals

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The cooling characteristic curves in a heated ingot with a diameter of 100 mm quenched by a water jet were measured under different conditions. A two-dimensional calculation model was established to calculate the HTC of magnesium alloy ingot with water spray cooling. Data from cast-in thermocouples trail were input into the model and the HTCs were back-calculated for the water quench region. The HTCs were calculated under different alloy types and roughness conditions, and the relationship between the ingot surface temperature, roughness, and the HTC was established accordingly. The results show that the greater the thermal conductivity of the alloy, the greater the heat transfer coefficient (HTC). The HTCs of AZ80, AZ31, and ZK60 alloys increase successively. With the decrease in the surface temperature, the HTC in both the impingement zone and the free−falling zone shows a trend of a rapid increase at first, then slowly increasing to the maximum value, and finally, a rapid decrease, with the peak value appearing at about 400 K. Considering the influence of the ingot surface temperature and the surface roughness on the HTC, the mathematical relationships between them are established.

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“…Practical implications for controlling the effect of water cooling on direct chill casting are suggested. A newly developed technique for quantifying heat transfer coefficients and heat fluxes for direct chill water sprays and new results on the effect of composition, temperature and flow rate are reported [2].…”

Section: Introductionmentioning

confidence: 99%

Archives of Thermodynamics

Mzad,

Otmani

2020

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As in many thermal processing technologies, there is a delicate balance between productivity and quality during ingot cooling process. Higher cooling velocities increase productivity but also create higher temperature gradients inside the ingot. Such a fast cooling does not leave sufficient time to establish the equilibrium within the solid, thus the final metal structure is strongly affected by the set up cooling mode throughout the liquid metal solidification. The first intention in this paper is to compare between three cooling modes in order to identify the required mode for a continuous casting process. Then, we study the influence of heat transfer coefficient on metal liquid-to-solid transition through the spray-cooled zone temperature and the metal latent heat of solidification. A gray iron continuous casting process subjected to water-sprays cooling was simulated using the commercial software for modeling and simulating multiphysics and engineering problems. The primary conclusions, from the obtained results, show the forcefulness of water spray cooling regarding standard cooling. Afterward, we highlight the great influence of heat transfer coefficient on the location of transition region as well as the relationship between heat transfer coefficient, wall outer temperature, latent heat dissipation, and the solidification time.

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Water Cooling in Direct Chill Casting: Part 1, Boiling Theory and Control

Cited by 6 publications

References 6 publications

Advances for DC Ingot Casting: Part 2 ‐ Heat Transfer and Casting Results

Advances for DC Ingot Casting: Part 2 ‐ Heat Transfer and Casting Results

Determination of Secondary Cooling Zone Heat Transfer Coefficient with Different Alloy Types and Roughness in DC Casting by Inverse Heat Conduction Method

Archives of Thermodynamics

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