The influence of selected parameters of spray cooling and thermal conductivity on heat transfer coefficient

Cebo-Rudnicka, A.; Malinowski, Z.; Buczek, A.

doi:10.1016/j.ijthermalsci.2016.06.031

Cited by 55 publications

(19 citation statements)

References 25 publications

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“…Among the governing parameters are spray properties, like droplet velocity, droplet diameter, mass flux density, or liquid properties [19,20,21,22,23]. Moreover, experiments of [24] with different target materials demonstrated that the heat transfer is influenced also by the thermal conductivity of the surface. Most of the models for the heat flux density and for the critical heat flux are completely empirical.…”

Section: Introductionmentioning

confidence: 99%

Fast transient spray cooling of a hot thick target

Tenzer

Roisman

2019

J. Fluid Mech.

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Spray cooling a hot target is characterized by strong heat flux density and fast change of the temperature of the wall interface. The heat flux density during spray cooling is determined by the instantaneous substrate temperature, which is illustrated by boiling curves. The variation of the heat flux density is especially notable during different thermodynamic regimes: film, transitional and nucleate boiling. In this study transient boiling curves are obtained by measurement of the local and instantaneous heat flux density produced by sprays of variable mass flux, drop diameter and impact velocity. These spray parameters are accurately characterized using a phase Doppler instrument and a patternator. The hydrodynamic phenomena of spray impact during various thermodynamic regimes are observed using a high-speed video system. A theoretical model has been developed for heat conduction in the thin expanding thermal boundary layer in the substrate. The theory is able to predict the evolution of the target temperature in time in the film boiling regime. Moreover, a remote asymptotic solution for a heat flux density during the fully developed nucleate boiling regime is developed. The theoretical predictions agree very well with the experimental data for a wide range of impact parameters.

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Section: Introductionmentioning

confidence: 99%

Fast transient spray cooling of a hot thick target

Tenzer

Roisman

2019

J. Fluid Mech.

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“…Hydraulic and pneumatic nozzle cooling is widely used in the secondary cooling of continuous casting as it provides a good balance in terms of its ability to remove high heat fluxes, efficiently uses liquid and obtains good uniformity in the temperature of the solidified product. Therefore, several researchers have studied parameters such as impingement density, w [1][2][3][4][5][6], speed and droplet size [2,[4][5][6][7], distance between the nozzle and the part to be cooled [3,8], roughness [2,9] and the spray angle [10], among others, since these modify the way in which the nozzles extract heat, furthermore Kominek et al [11] found that the choice of nozzles and their overlaps has a significant influence on cooling homogeneity. However, poor heat extraction can cause the appearance of defects such as internal or surface cracks that influence the quality of the solidified products [12,13].…”

Section: Introductionmentioning

confidence: 99%

Impingement Density Analysis on Heat Transfer and the Appearance of Edge Cracks in Conventional Slab Using Hydraulic Nozzles

Ruiz-Pineda

Aguilar-Corona

Hernández-Bocanegra

et al. 2022

Metals

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In this work, the fluid dynamics and heat transfer of two hydraulic nozzles used in the secondary cooling of the conventional slab continuous casting machine were analyzed. Impingement density maps, the jet opening angle and heat flux associated with different operating conditions (impingement distance, pressure) were experimentally determined. The opening angle and impingement density footprint were found to vary considerably in shape and magnitude with varying operating pressure and distances. Finally, it was found that when short operating distances are used, a greater heat extraction gradient occurs in the major axis of the impingement footprint, which promotes edge-cracks in the slab in plant.

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“…Similarly to many related studies, as an alternative for mathematical modeling based on phenomenology, numerical methods based on the solution of an inverse problem is used for definition of the heat transfer coefficient [ 27 , 29 , 30 , 31 ]. The goal of this paper is formulation of heat transfer coefficient (HTC) function for mixed environment of air-atomized water spray simultaneously with accelerated air and its use in modeling of interrupted controlled cooling, which forms a case study illustrating the application of the results in forging practice.…”

Section: Introductionmentioning

confidence: 99%

Determination of Heat Transfer Coefficient for Air-Atomized Water Spray Cooling and Its Application in Modeling of Thermomechanical Controlled Processing of Die Forgings

2022

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The paper presents the method and results of determination of heat transfer coefficient for air-atomized water spray cooling with consideration of infrastructural factors of industrial cooling conveyor, such as effect of accelerated air. The established values of heat transfer coefficient were implemented into a numerical model of cooling line, with special definition of sprayers and the movement of the part subjected to quenching. After quantitative validation on selected samples, the obtained coefficients were used for the solution of the technological problem by means of localized cooling rate enhancement, which forms a case study confirming reliability of the established water spray heat transfer functions and suitability of the determined models for design of thermomechanical controlled processing of complex-geometry parts.

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The influence of selected parameters of spray cooling and thermal conductivity on heat transfer coefficient

Cited by 55 publications

References 25 publications

Fast transient spray cooling of a hot thick target

Fast transient spray cooling of a hot thick target

Impingement Density Analysis on Heat Transfer and the Appearance of Edge Cracks in Conventional Slab Using Hydraulic Nozzles

Determination of Heat Transfer Coefficient for Air-Atomized Water Spray Cooling and Its Application in Modeling of Thermomechanical Controlled Processing of Die Forgings

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