Simulation of temperature distribution in the oriented silicon steel coil in the heating stage of annealing process

Xia, Tian; Xiang, Zhen; He, Zhu; Hu, Shoutian; Luo, Zhonghan

doi:10.1016/j.applthermaleng.2018.10.121

Cited by 5 publications

(7 citation statements)

References 15 publications

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“…The temperature difference of the cover is within 30 °C [ 12 ] which implied that the simulation region outside the cover might be simplified significantly. A centrosymmetry model is used in simulation, and the mesh applied in the model is shown in Figure 5 .…”

Section: Heat Transfer Modelmentioning

confidence: 99%

“…As the thickness of cover is only 1 cm, and the thermal conductivity of it is more than 20 W (m K) −1 [ 12 ] during annealing, the temperature of cover is able to restore steady quickly when the temperature of flue gas changes. Therefore, Q co = Q ci all the time, then

Q_{normalr} + Q_{normalc} - Q_{ci} = 0 - \frac{σ}{R} T_{co}^{4} - h T_{co} + \frac{σ}{R} T_{normalg}^{4} + h T_{normalg} - Q_{ci} = 0

where T g is the temperature of flue gas (K); T co is the temperature of outside surface of cover (K); T ci is the temperature of internal surface of cover (K); h is the convection coefficient between cover and flue gas (W (m 2 K) −1 ); σ is the Stefan–Boltzmann constant (5.67 × 10 − 8 W (m 2 · K 4 ) −1 ); Q ci is the known number in this equation; it will be solved through the radiative transfer model described in Section 3.3.…”

Section: Heat Transfer Modelmentioning

confidence: 99%

“…Structured mesh is applied in mesh generation; Figure 8 shows the number of mesh on each surface in radiative transfer model. As the temperature difference across the cover is within 30 °C during the heating stage, [ 12 ] it is assumed well distributed; therefore, the number of mesh on cover is 1. There are 238 radiation surfaces in this model.…”

Section: Heat Transfer Modelmentioning

confidence: 99%

“…The thermophysical parameters used in the heat transfer model refer to Xia's article, [ 12 ] including the emissivity of coil and cover, the thermal conductivity, and capacity of silicon steel and stainless 2520 (the material of cover, plate, and cylinder in Figure 4).…”

Section: Heat Transfer Modelmentioning

confidence: 99%

“…But the result was not always great; the strip near the top of the coil was often blued. Xia [ 12 ] simulated the heat transfer inside the annular furnace during the heating stage of high‐temperature annealing using Fluent. The result showed that the temperature difference within the coil was above 400 °C during the first soaking; therefore, the decomposition rate of Mg(OH) 2 also differs significantly across the coil.…”

Section: Introductionmentioning

confidence: 99%

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The Heat Transfer Model of Oriented Silicon Steel Coil in Annular Furnace during the Heating Stage of High‐Temperature Annealing

Xia

Luo³

2020

steel research int.

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A 2D numerical model is built to simulate the heat transfer across the oriented silicon steel coil in annular furnace during the heating stage of high‐temperature annealing. A new method is proposed to calculate the view factors in the radiation submodel. The numerical result is verified through the comparison with the results of in situ experiments. For a coil with 1710 mm outside and 510 mm inside diameters, the heat absorbed by the outer surface of the coil is the highest, but the heat flux density along the axial direction of the coil is larger than the radial direction. The heat flux density of the outer surface shows an 86% rise depending on the increase in radial thermal conductivity after 75% H2 and 25% N2 is applied as the protective atmosphere at a heating time of 37 h. The temperature difference inside the coil ranges from 143 to 476 °C till the furnace reaches its designate temperature at 58 h, but the heating rate is nearly the same across the coil above 700 °C. The difference of property inside the coil is probably related to the difference of heating rate during the first soaking.

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Section: Heat Transfer Modelmentioning

confidence: 99%