Assessment of uniform temperature assumption in zoning on the numerical simulation of a walking beam reheating furnace
Assessment of uniform temperature assumption in zoning on the numerical simulation of a walking beam reheating furnace
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DOI：
10.1016/j.applthermaleng.2014.11.054
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发表时间：
2015-02
影响因子：
6.4
通讯作者：
T. Morgado;P. Coelho;P. Talukdar
中科院分区：
文献类型：
--
作者：
T. Morgado;P. Coelho;P. Talukdar
采用两种不同的模型对步进式加热炉内板坯加热过程进行了数值模拟。在一个模型中，炉内的湍流反应流与板坯中的热传导一起被模拟。使用商业代码进行计算，并使用用户定义的函数来模拟炉内步进梁引起的板坯的周期性运动。进行非定常计算，直到获得周期性瞬态解。在第二个模型中，炉被划分为少量的区域，并且基于第一个模型的结果在每个区域中规定平均温度和化学成分。板坯的非稳态加热过程模拟使用相同的软件，并占炉中的辐射传递和板坯中的热传导。第一个模型的结果作为第二个模型的基准。结果表明，第一个模型预测的辐射热通量和温度的板坯与以前的工作是一致的。这两个模型产生的体积平均温度的板坯离开炉的差异小于3%，提供的气体和壁的温度的精确值被使用。第二个模型在计算上更经济，只需要第一个模型的大约5%的计算时间。
The numerical simulation of the heating process of steel slabs in a walking beam reheating furnace is reported using two different models. In one model, the turbulent reactive flow in the furnace is simulated together with the heat conduction in the slabs. The calculations are performed using a commercial code and a user-defined function is used to simulate the periodic movement of the slabs by the walking beams in the furnace. Unsteady calculations are performed until a periodic transient solution is achieved. In the second model, the furnace is divided into a small number of zones and the average temperature and chemical composition are prescribed in every zone based on the results of the first model. The unsteady heating process of the slabs is modeled using the same software and accounting for radiative transfer in the furnace and heat conduction in the slabs. The results of the first model are taken as a benchmark for the second one. It is shown that the first model predicts radiative heat fluxes and temperatures of the slabs that are consistent with previous work. The two models yield volume average temperatures of the slabs leaving the furnace that differ by less than 3%, provided that accurate values of the temperature of the gases and walls are used. The second model is computationally more economical, requiring only about 5% of the computational time of the first one.