In polymer industry several applications are aimed at obtaining products by deforming preforms or sheets after a heating process which, if not carried out properly, may lead to unacceptable defects in the final product. A common example of such an application is the end-forming process of polyvinyl chloride (PVC) tubes, in order to allow piping connections. One end of the tube undergoes a deformation process preceded by a heating phase, which is conducted in a oven equipped with infrared lamps. The pipe rotates with a given angular velocity, in order to ensure uniform heating. Hence, the pipe angular velocity represents a fundamental parameter for the proper success of end-forming process. In this work, the transient analysis of the radiative heat exchange between rotating PVC pipes and infrared lamps of a oven for end-forming process has been carried out by means of a finite element model, in order to investigate the influence of cylinder angular velocity on the temperature distribution in the tube. Local view factors were calculated as a function of geometry and oven configuration and were expressed as a function of angular velocity, allowing pipe rotation to be simulated as a time-dependent boundary condition, instead of using a moving mesh. Simulations were carried out for tubes of different geometries and for different values of angular velocity and results were compared with the case of a uniformly irradiated tube. The model realized represents a tool to characterize the end-forming process for different polymeric materials and different oven configurations.

Transient analysis of the radiative heating of rotating PVC pipes in a oven for end-forming process / Lucchi, Michael; Lorenzini, Marco. - In: APPLIED THERMAL ENGINEERING. - ISSN 1359-4311. - STAMPA. - 129:(2018), pp. 84-92. [10.1016/j.applthermaleng.2017.10.018]

Transient analysis of the radiative heating of rotating PVC pipes in a oven for end-forming process

LUCCHI, MICHAEL;LORENZINI, MARCO
2018

Abstract

In polymer industry several applications are aimed at obtaining products by deforming preforms or sheets after a heating process which, if not carried out properly, may lead to unacceptable defects in the final product. A common example of such an application is the end-forming process of polyvinyl chloride (PVC) tubes, in order to allow piping connections. One end of the tube undergoes a deformation process preceded by a heating phase, which is conducted in a oven equipped with infrared lamps. The pipe rotates with a given angular velocity, in order to ensure uniform heating. Hence, the pipe angular velocity represents a fundamental parameter for the proper success of end-forming process. In this work, the transient analysis of the radiative heat exchange between rotating PVC pipes and infrared lamps of a oven for end-forming process has been carried out by means of a finite element model, in order to investigate the influence of cylinder angular velocity on the temperature distribution in the tube. Local view factors were calculated as a function of geometry and oven configuration and were expressed as a function of angular velocity, allowing pipe rotation to be simulated as a time-dependent boundary condition, instead of using a moving mesh. Simulations were carried out for tubes of different geometries and for different values of angular velocity and results were compared with the case of a uniformly irradiated tube. The model realized represents a tool to characterize the end-forming process for different polymeric materials and different oven configurations.
2018
Transient analysis of the radiative heating of rotating PVC pipes in a oven for end-forming process / Lucchi, Michael; Lorenzini, Marco. - In: APPLIED THERMAL ENGINEERING. - ISSN 1359-4311. - STAMPA. - 129:(2018), pp. 84-92. [10.1016/j.applthermaleng.2017.10.018]
Lucchi, Michael; Lorenzini, Marco
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/609603
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