Advanced Thermal Analysis of Three-Dimensional Conjugate Heat Transfer with Radial Radiation in Horizontal Pipe for Sustainability

An advanced analysis of thermal behavior of three-dimensional conjugate heat transfer in a horizontal pipe with a fluid flow in a steady and transient states is performed. A numerical procedure of three-dimensional conjugate heat conduction in a solid wall and heat convection in a laminar flow with radial radiation is developed by analyzing a computational modeling of the solid-fluid domains. The procedure is based on the assumption that the gradient of temperature and heat flux of the solid-fluid domains are dependent on the thermal equivalent between conduction, convection and radiation heat transfers, which is true since the thermal loads on the pipe are reasonably identified. Annealed stainless steel as a common solid pipe is used with two types of fluids (air and water) for sustainability assessment. The results of the thermal analysis are represented by various parameters in the steady and transient states to emphasize the effect of the three-dimensional conjugate heat transfer combined with radial radiation on the fluid flow. These parameters are the temperature distribution and the heat flux from the ambient to the fluid flow and the fluid velocity. The environmental impacts on the pipe are estimated in terms of Air Acidification and Water Eutrophication. It can be concluded from the thermal analysis that the computational modeling of the thermal loads recommends for different types of engineering devices such as a convergent-divergent nozzle.