Segregated modeling of continuous heat treatment furnaces

Name: Segregated modeling of continuous heat treatment furnaces
Author: Yıldız, Ersin, Başol, Altuğ Melik, Mengüç, Mustafa Pınar

İsim	Segregated modeling of continuous heat treatment furnaces
Yazar	Yıldız, Ersin, Başol, Altuğ Melik, Mengüç, Mustafa Pınar
Basım Tarihi:	2020-07
Basım Yeri	- Elsevier
Konu	Continuous annealing furnaces, Thermal radiation, Modeling
Tür	Süreli Yayın
Dil	İngilizce
Dijital	Evet
Yazma	Hayır
Kütüphane:	Özyeğin Üniversitesi
Demirbaş Numarası	0022-4073
Kayıt Numarası	8b563648-6199-4a55-967a-68f7e958552c
Lokasyon	Mechanical Engineering
Tarih	2020-07
Notlar	TÜBİTAK ; Center of Energy, Environment and Economy (CEEE/ECEM) at Ozyegin University
Örnek Metin	Heat treatment processes have a major impact on the mechanical and structural properties of the end products. Accurate control of the material temperatures during the heating and cooling regimes is very crucial for the quality of a given production. However, especially in continuous heat treatment furnaces the products inside the furnace are rarely in thermal equilibrium with the furnace and monitoring the air temperature inside the furnace provides a very indirect information about the solid temperatures of the products. In this study, the solid temperatures of the products inside a continuous glassware annealing furnace model is solved numerically. The continuous furnace model is divided into heating and cooling sections each filled with rows of goblets and they are treated separately using a segregated modeling approach. In this approach, the convective heat transfer inside the furnace is modelled using a steady-state convection solver in stationary frame of reference. The transient heat conduction inside the moving goblets is calculated using a separate transient heat conduction solver in moving frame of reference. Thermal radiation exchange between the surfaces is treated using a new backward Monte Carlo based surface-to-surface radiation model and the calculated radiative heat fluxes are added as heat flux boundary conditions on the goblet outer walls. Similarly, the convective heat fluxes calculated with the convection solver are also imposed as heat flux boundary conditions. This iterative solution approach showed a fast convergence behavior requiring only 4 iterations to converge both for the heating and cooling sections of the furnace. The overall computational cost of the simulation is measured as 10 h and 20 h for the heating and cooling sections, respectively. Among all the three heat transfer modes, convection is found to be by far computationally the most expensive, followed by the thermal radiation and conduction being the computationally least expensive one. Overall, the approach enables to conduct high fidelity analysis of the heat treatment processes with acceptable computational cost.
DOI	10.1016/j.jqsrt.2020.106993
Cilt	249

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Segregated modeling of continuous heat treatment furnaces

Yazar Yıldız, Ersin, Başol, Altuğ Melik, Mengüç, Mustafa Pınar

Basım Tarihi 2020-07

Basım Yeri - Elsevier

Konu Continuous annealing furnaces, Thermal radiation, Modeling

Tür Süreli Yayın

Dil İngilizce

Dijital Evet

Yazma Hayır

Kütüphane Özyeğin Üniversitesi

Demirbaş Numarası 0022-4073

Kayıt Numarası 8b563648-6199-4a55-967a-68f7e958552c

Lokasyon Mechanical Engineering

Tarih 2020-07

Notlar TÜBİTAK ; Center of Energy, Environment and Economy (CEEE/ECEM) at Ozyegin University

Örnek Metin Heat treatment processes have a major impact on the mechanical and structural properties of the end products. Accurate control of the material temperatures during the heating and cooling regimes is very crucial for the quality of a given production. However, especially in continuous heat treatment furnaces the products inside the furnace are rarely in thermal equilibrium with the furnace and monitoring the air temperature inside the furnace provides a very indirect information about the solid temperatures of the products. In this study, the solid temperatures of the products inside a continuous glassware annealing furnace model is solved numerically. The continuous furnace model is divided into heating and cooling sections each filled with rows of goblets and they are treated separately using a segregated modeling approach. In this approach, the convective heat transfer inside the furnace is modelled using a steady-state convection solver in stationary frame of reference. The transient heat conduction inside the moving goblets is calculated using a separate transient heat conduction solver in moving frame of reference. Thermal radiation exchange between the surfaces is treated using a new backward Monte Carlo based surface-to-surface radiation model and the calculated radiative heat fluxes are added as heat flux boundary conditions on the goblet outer walls. Similarly, the convective heat fluxes calculated with the convection solver are also imposed as heat flux boundary conditions. This iterative solution approach showed a fast convergence behavior requiring only 4 iterations to converge both for the heating and cooling sections of the furnace. The overall computational cost of the simulation is measured as 10 h and 20 h for the heating and cooling sections, respectively. Among all the three heat transfer modes, convection is found to be by far computationally the most expensive, followed by the thermal radiation and conduction being the computationally least expensive one. Overall, the approach enables to conduct high fidelity analysis of the heat treatment processes with acceptable computational cost.

DOI 10.1016/j.jqsrt.2020.106993

Cilt 249