Analysis of Nusselt Number for Natural Convection in Package of Square Steel Sections

Wyczółkowski, R.; Szmidla, Janusz; Gała, M.; Bagdasaryan, Vazgen

doi:10.12693/aphyspola.139.548

Cited by 3 publications

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“…It was also demonstrated that above 300 • C, thermal radiation is essential for the whole phenomenon. In the next article [41,42], the complex heat transfer in the packages of rectangular steel sections was analyzed in turn. It was established that the heat transfer intensity in such systems mostly depends on the thermal contact resistance R ct between adjacent layers of the package.…”

Section: Resultsmentioning

confidence: 99%

Experimental Investigations of Effective Thermal Conductivity of the Selected Examples of Steel Porous Charge

Wyczółkowski

2021

Solids

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In many cases of heat treatment of steel products, the heated charge has a porous structure. The examples of such charges include bundles of long steel components e.g., bars. The basic thermal property of the charge in this form is effective thermal conductivity kef. This paper presents the results of experimental examinations of effective thermal conductivity of the porous charge, which is composed from various types of steel long components. Due to the specific nature of the samples, a special measurement stand was constructed based on the design of a guarded hot plate apparatus. The measurements were performed for sixteen different samples across a temperature range of 70–640 °C. The porosity of the samples, depending on the type of components used, ranged from 0.03 to 0.85. Depending on these factors, the effective thermal conductivity ranged from 1.75 to 8.19 W·m−1·K−1. This accounts for 0.03 to 0.25 of the value of thermal conductivity of the solid phase of the charge, which in the described cases was low-carbon steel. It was found that the effective thermal conductivity rises linearly with temperature. The intensity of this increase and the value of coefficient kef depend on the transverse dimension of the components that form the charge. The results may represent the basis for the validation of various models of effective thermal conductivity with respect to the evaluation of thermal properties of the porous charge.

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Section: Resultsmentioning

confidence: 99%

Experimental Investigations of Effective Thermal Conductivity of the Selected Examples of Steel Porous Charge

Wyczółkowski

2021

Solids

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“…However, after supporting these findings with further research based on the dimensional analysis and the theory of similarity, it is possible to describe the natural convection in quantitative terms. For this purpose, the Rayleigh and Nusselt numbers are used [44,45].…”

Section: The Investigation Of a Porous Charge By Means Of Schlieren I...mentioning

confidence: 99%

“…This phenomenon is connected with simultaneous conduction and natural convection. Both mechanisms of the heat transfer can be treated jointly as an intensified heat conduction expressed quantitatively by the equivalent gas thermal conductivity k eg [38,45]:…”

Section: Modelling Of Effective Thermal Conductivity Of a Porous Chargementioning

confidence: 99%

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The Review of Chosen Methods Used to Investigate Heat Transfer in a Steel Porous Charge

et al. 2022

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The paper presents chosen experimental and model methods of investigating heat transfer in a steel porous charge. The results of this investigation provide information on both the qualitative and quantitative course of the analysed processes of heat exchange. The parameters which characterise the analysed phenomenon in a quantitative manner, among others, are: The effective thermal conductivity kef, the thermal contact resistance Rct and Nusselt number Nu. It has been established that it is not possible to use literature models in order to determine the kef coefficient. The authors present their own model of effective thermal conductivity. The above-mentioned parameters for a porous charge reach the values within the following ranges: kef: 1.0–8.5 W/(m×K); Rct: 0.0019–0.0057 (m2×K)/W; Nu: 1.2–7.1.

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Modelling of effective thermal conductivity of a packed bed of steel bars with the use of chosen literature models

Wyczółkowski

Bagdasaryan

Tomczyk

2022

Composite Structures

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Analysis of Nusselt Number for Natural Convection in Package of Square Steel Sections

Cited by 3 publications

References 0 publications

Experimental Investigations of Effective Thermal Conductivity of the Selected Examples of Steel Porous Charge

Experimental Investigations of Effective Thermal Conductivity of the Selected Examples of Steel Porous Charge

The Review of Chosen Methods Used to Investigate Heat Transfer in a Steel Porous Charge

Modelling of effective thermal conductivity of a packed bed of steel bars with the use of chosen literature models

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