Experimental Investigations of Effective Thermal Conductivity of the Selected Examples of Steel Porous Charge
Abstract
:1. Introduction
2. Materials and Methods
2.1. Experimental Setup
2.2. Investigated Samples
2.3. Measurement Procedure
2.4. Measurement Uncertainty
3. Results and Discussion
4. Conclusions
- Depending on the temperature, size, shape, and arrangement, the effective thermal conductivity of packed bundles of various long components made of low-carbon steel changes over the range of 1.7–8.2 W·m−1·K−1;
- The values of coefficient kef range from 0.03 to 0.25 of thermal conductivity of the solid phase of the charge;
- The effective thermal conductivity rises linearly with temperature, whereas the intensity of this increase and the value of coefficient kef depend on the transverse dimension of the components that form the charge;
- Coefficient kef declines with the increase in the external porosity of the charge, which depends on the transverse shape of the components and their arrangement;
- A lower effect on the value of kef is observed from internal porosity that concerns hollow components and is related to their geometry;
- A substantial impact on the value of coefficient kef is observed for thermal contact resistance, occurring between the adjacent components of the charge, with the value of this resistance depending mainly on the real contact area in the joints.
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
Sample Availability
References
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Sample Type | Element Dimension | k0 | β | R2 |
---|---|---|---|---|
Staggered round bars | 10 mm | 1.57 | 0.0021 | 0.981 |
20 mm | 2.39 | 0.0042 | 0.974 | |
30 mm | 3.11 | 0.0051 | 0.998 | |
In-line round bars | 10 mm | 1.48 | 0.0022 | 0.993 |
20 mm | 2.02 | 0.0037 | 0.993 | |
30 mm | 2.54 | 0.0054 | 0.990 | |
Square bars | 10 mm | 2.54 | 0.0019 | 0.994 |
20 mm | 4.48 | 0.0031 | 0.967 | |
30 mm | 5.91 | 0.0036 | 0.982 | |
Parallel flat bars | 5 × 20 mm | 1.86 | 0.0014 | 0.993 |
10 × 40 mm | 2.43 | 0.0015 | 0.992 | |
Mixed flat bars | 5 × 20 mm | 2.10 | 0.0021 | 0.980 |
10 × 40 mm | 3.09 | 0.0033 | 0.988 | |
Sections | 40 × 40 mm | 3.95 | 0.0019 | 0.984 |
60 × 60 mm | 4.18 | 0.0031 | 0.977 |
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Wyczółkowski, R. Experimental Investigations of Effective Thermal Conductivity of the Selected Examples of Steel Porous Charge. Solids 2021, 2, 420-436. https://doi.org/10.3390/solids2040027
Wyczółkowski R. Experimental Investigations of Effective Thermal Conductivity of the Selected Examples of Steel Porous Charge. Solids. 2021; 2(4):420-436. https://doi.org/10.3390/solids2040027
Chicago/Turabian StyleWyczółkowski, Rafał. 2021. "Experimental Investigations of Effective Thermal Conductivity of the Selected Examples of Steel Porous Charge" Solids 2, no. 4: 420-436. https://doi.org/10.3390/solids2040027