The Effective Thermal Conductivity Method in Continuous Casting of Steel

An advanced approach for modeling solidification, heat transfer, and fluid flow is used to study an industrial bloom caster with a bifurcated submerged entry nozzle. The advantage of this approach is the increased accuracy from using temperature‐dependent material properties and precise heat transfer boundary conditions. The computational domain encompasses the whole liquid pool and computational factors affecting the accuracy are analyzed. According to the results, severe shell thinning on the narrow faces is caused by impinging jets from the submerged entry nozzle, which are highly localized and affect the superheat distribution. Most of the superheat is dissipated in the mold, but the remainder is spread to a large area in the secondary cooling zone, which can only be investigated by coupled CFD models extending far enough. Heat transfer models based on the effective thermal conductivity method can be used to determine the end of the liquid pool and solid shell temperatures, but cannot capture the features of areas, where the liquid fraction is high.

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Thermal Transport in Micro- and Nanoscale Systems

Maitra¹,

Zhang²,

Tiwari³

2018

Handbook of Thermal Science and Engineering

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Small scale (micro/nanoscale) heat transfer has broad and exciting range of applications. Heat transfer at small scale quite naturally is influenced-sometimes dramatically-with high surface area to volume ratios. This in effect means that heat transfer in small scale devices and systems is influenced by surface treatment and surface morphology. Importantly, interfacial dynamic effects are at least non-negligible and there is a strong potential to engineer the performance of such devices using the progress in micro and nanomanufacturing technologies. With this motivation, the emphasis here is on heat conduction and convection. The chapter starts with a broad introduction to Boltzmann Transport equation which can capture the physics of small scale heat transport and outlining the reasons why small scale transport distinct from classical micro scale heat transport. Among applications, examples are thermoelectric and thermal interface materials where micro and nanofabrication has led to impressive figure of merits and thermal management performance. Basic of phonon transport and its manipulation through nanostructuring materials are discussed in detail. Small scale single phase convection and the crucial role it has played in developing the thermal management solutions for next generation of electronics and energy harvesting devices are discussed as next topic. Features of micro cooling platforms and physics of optimized thermal transport using micro channel manifold heat sinks are discussed in detail along with a discussion of how such systems also facilitate use of low grade, waste heat from data centres and photovoltaic modules. Phase changes process and their control using surface micro/nanostructure are discussed next. Among the feature considered, the first are microscale heat pipes where capillary effects play an important role. Next the role of nanostructures in controlling nucleation and mobility in boiling, condensation and icing are discussed great detail. Special emphasis is placed on the limitations of current surface and device manufacture technologies while also

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The Effective Thermal Conductivity Method in Continuous Casting of Steel

Cited by 17 publications

References 14 publications

Multiscale Modeling of the Solidification Structure Evolution of Continuously Cast Steel Blooms and Slabs

Multiscale Modeling of the Solidification Structure Evolution of Continuously Cast Steel Blooms and Slabs

Investigation of Solidification, Heat Transfer and Fluid Flow in Continuous Casting of Steel Using an Advanced Modeling Approach

Thermal Transport in Micro- and Nanoscale Systems

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