Fuzzy estimation for heat flux distribution at the slab continuous casting mold surface

2014 ◽  
Vol 83 ◽  
pp. 80-88 ◽  
Author(s):  
Hong Chen ◽  
Litao Su ◽  
Guangjun Wang ◽  
Shibin Wan ◽  
Lihui Zhang ◽  
...  
Keyword(s):  
Heat Flux ◽  
Continuous Casting ◽  
Flux Distribution ◽  
Mold Surface ◽  
Heat Flux Distribution ◽  
Continuous Casting Mold ◽  
Casting Mold ◽  
Slab Continuous Casting

scholarly journals Comparison of the Flow Field in a Slab Continuous Casting Mold between the Thicknesses of 180 mm and 250 mm by High Temperature Quantitative Measurement and Numerical Simulation

Metals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1886
Author(s):  
Yibo Liu ◽  
Jian Yang ◽  
Fuxiang Huang ◽  
Keran Zhu ◽  
Fenggang Liu ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
High Temperature ◽  
Flow Field ◽  
Continuous Casting ◽  
Quantitative Measurement ◽  
Powder Layer ◽  
Mold Surface ◽  
Continuous Casting Mold ◽  
Casting Mold ◽  
Slab Continuous Casting

In the present work, the flow field in a slab continuous casting mold with thicknesses of 180 and 250 mm are compared using high temperature quantitative measurement and numerical simulation. The results of the numerical simulation are in agreement with those of the high temperature quantitative measurement, which verifies the accuracy and reliability of the numerical simulation. Under the same working conditions, the velocities near the mold surface with the thickness of 180 mm were slightly higher than those of the mold with the thickness of 250 mm. The flow pattern in the 180 mm thick mold maintains DRF more easily than that in 250 mm thick mold. The kinetic energy of the jet dissipates faster in the 250 mm thick mold than in the 180 mm mold. For double-roll flow (DRF), as the argon gas bubbles can be flushed into the deeper region under the influence of strong jets on both sides, the argon bubbles distribute widely in the mold. For single-roll flow (SRF), as the argon bubbles float up quickly after leaving the side holes, the bubble distribution is more concentrated in the width direction, which may cause violent interface fluctuation and slag entrainment. The fluctuation at the steel-slag interface in the mold with 180 mm thickness is greater than that in the mold with 250 mm thickness but less than 5 mm. The increase of mold thickness may lead to a decrease of the symmetry of the flow field in the thickness direction and uniformity of mold powder layer thickness. In summary, the steel throughput should be increased in the 250 mm thick mold compared with that in the 180 mm thick mold.

Fuzzy Identification of the Time- and Space-Dependent Internal Surface Heat Flux of Slab Continuous Casting Mold

2018 ◽  
Vol 140 (12) ◽  
Author(s):  
Guangjun Wang ◽  
Shibin Wan ◽  
Hong Chen ◽  
Kun Wang ◽  
Cai Lv
Keyword(s):  
Heat Flux ◽  
Continuous Casting ◽  
Surface Heat Flux ◽  
Fuzzy Inference ◽  
Internal Surface ◽  
Surface Heat ◽  
Normal Distribution Function ◽  
Continuous Casting Mold ◽  
Time And Space ◽  
Casting Mold

To identify the transient and distributed internal surface heat flux of the slab mold in continuous casting process, a fuzzy inference method is proposed in this work. For temporal and spatial distribution characteristics of the internal surface heat flux of continuous casting mold, a decentralized fuzzy inference (DFI) identification scheme possessed of a decoupling characteristic in time and space is established. For each temperature measurement point, the fuzzy inference processes are, respectively, executed from the correspondingly observed temperature sequence through corresponding DFI units. In the time domain, according to sensitivity coefficients, the weighing and synthesizing processes for the decentralized inference results are performed to get the temporal compensation vector for the internal surface heat flux of mold. Then, in the space domain, according to the normal distribution function, the weighing and synthesizing processes for the temporal compensation vectors are performed to get the spatial compensation vector for the internal surface heat flux of mold. Numerical tests are carried out to research the influence of the number of thermocouples and measurement errors on the identification results, which prove the effectiveness of proposed scheme in this work.

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