Investigation of heat transfer by means of pool film boiling on vertical cylinders in gravity

Bölükbaşi, Abdurrahim; Çiloğlu, Doğan

doi:10.1007/s00231-007-0238-7

Cited by 25 publications

(5 citation statements)

References 8 publications

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“…However, in the nuclear application, quench tests with rods are required because the nuclear fuel geometry is cylindrical. Therefore, the cylindrical test specimen (diameter 20 Â 75 mm) was selected, which is made of brass material used previously [20,21]. To prevent the premature collapse of the vapor film during the quenching tests, the bottom of the cylinder was semi-spherical, as shown in Fig.…”

Section: Test Specimenmentioning

confidence: 99%

Pool boiling heat transfer characteristics of vertical cylinder quenched by SiO2–water nanofluids

Bölükbaşi

Çiloğlu

2011

International Journal of Thermal Sciences

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Section: Test Specimenmentioning

confidence: 99%

Pool boiling heat transfer characteristics of vertical cylinder quenched by SiO2–water nanofluids

Bölükbaşi

Çiloğlu

2011

International Journal of Thermal Sciences

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“…Although some other procedures to minimize the sensitivity of the initial conditions have also been developed and applied [13], these methods involve a multitude of fitting parameters based on the system characteristics (such as casting geometry), detailed differences in the mold material, quenchant behavior [1,14] to name a few, which are very hard to manage and derive for industrial applications. Other heat transfer inverse analyses by curve fitting methods [15], network simulation methods [16] and optimization methods [17] have also been researched. Some analytical methods to estimate material behavior to stress conditions are also available [18,19].…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of immersion quenching process of an engine cylinder head

Srinivasan

Moon

Chapman

et al. 2010

Applied Mathematical Modelling

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a b s t r a c tIn this article, we present the numerical simulations of a real cylinder head quench cooling process employing a newly developed boiling phase change model using the commercial CFD code AVL-FIRE v8.5. Separate computational domains constructed for the solid and liquid regions are numerically coupled at the interface of the solid-liquid boundaries using the AVL-Code-Coupling-Interface (ACCI) feature. The boiling phase change process triggered by the dipping hot metal and the ensuing two-phase flow is handled using an Eulerian two-fluid method. Multitude of flow features such as vapor pocket generation, bubble clustering and their disposition, are captured very effectively during the computation, in addition to the variation of the temperature pattern within the solid region. A comparison of the registered temperature readings at different monitoring locations with the numerical results generates an overall very good agreement and indicates the presence of intense non-uniformity in the temperature distribution within the solid. Overall, the predictive capability of the new boiling model is well demonstrated for real-time quenching applications.

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“…The film boiling mechanism is described by the correlation proposed by Bolukbasi [15] for vertical cylinders.…”

Section: Heat Transfermentioning

confidence: 99%

Thermo-Fluid-Dynamics Quenching Model: Effect on Material Properties

Passarella¹,

L-Cancelos²,

Vieitez³

et al. 2014

Proceedings of 10th World Congress on Computational Mechanics

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Abstract.A fully-coupled model of quenching by submerging for steel workpieces is presented. The model includes cooling of the piece due to piece-to-bath heat transfer calculations by solving the multiphase problem of an evaporable fluid, as well as the corresponding metallurgical transformations, the generation of residual stresses and associated geometrical distortions. The heat transfer model takes into account different boiling stages, from film boiling at very high workpiece surface temperatures, to single-phase convection at surface temperatures below saturation. The evolution and activation of each heat transfer mechanism depend on the dynamics of the vapor-liquid multiphase system of the quenching bath. The multiphase flow was modeled using the drift-flux mixture model, including an equation of conservation of energy of the liquid phase. Metallurgical transformations, geometrical distortions and residual stresses at the end of the process, are obtained based on the different cooling rates along the piece. The final distribution of metallurgical phases is obtained by the integration of the thermal evolution and using information of the CCT diagrams of studied steels. The analysis of deformations and residual stresses takes into account elasto-plasticity (without viscosity effects), transformation induced plasticity and hardening restoring phenomena. Comparison of results considering the approach presented here versus a simplified heat transfer model indicates that the level of induced residual stresses are noticeable different implying the necessity of developing a more precise heat transfer quenching model.

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Investigation of heat transfer by means of pool film boiling on vertical cylinders in gravity

Cited by 25 publications

References 8 publications

Pool boiling heat transfer characteristics of vertical cylinder quenched by SiO2–water nanofluids

Pool boiling heat transfer characteristics of vertical cylinder quenched by SiO2–water nanofluids

Numerical simulation of immersion quenching process of an engine cylinder head

Thermo-Fluid-Dynamics Quenching Model: Effect on Material Properties

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