What is it about?
This work is based on a numerical study of the fluid-structure thermal coupling in a concrete slab intended for habitable heating. A rectangular cross-section pipe in which a hot fluid flow is installed in this concrete slab. The Navier-Stokes equations that govern this flow have been solved numerically. To this end, these equations have been discretized by an implicit finite difference method. The systems of algebraic equations thus obtained have been solved by the Gauss and Thomas algorithms. The conduction equation in the concrete slab was solved using the same methodology as that of flow. In fact, we have based on an algorithm that makes an unsteady solid medium interact with a fluid medium consisting of permanent states series while ensuring the equality of fluxes and temperatures on the common interface between both media at every moment. The numerical simulation of heat transfer and the thermal behavior of the heating slab were analyzed for different parameters influencing thermal diffusion. The results obtained by the numerical model adopted for the control of the fluid-structure coupling are in good agreement with those of the literature results.
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Why is it important?
With stricter environmental standards and a reduction in the use of fossil fuels in the future, renewable energy heating is becoming increasingly important. Passive solar is a process of generating thermal energy by converting solar radiation into heat. Solar energy is the most developed compared to other renewable energies. However, the behavior of the conversion systems for this energy type is strongly dependent on variations in climatic parameters, such as temperature, solar irradiation and storage facilities
Perspectives
The objective of this numerical study is to adapt an adequate methodology to control and characterize the heat exchanges within a heating slab intended for heating by the ground. Indeed, we analyzed the temperature evolution at the inlet, the middle and the outlet of the system according to the space step. The evolution of the slab temperature for different concrete thicknesses and the effect of variation of the convective exchange coefficient with ambient air on the surface temperature of the slab have been also analyzed. On the other hand, we have highlighted the effect of the Reynolds number variation on the evolution of the fluid velocity profile in the pipe. From the obtained results, we can draw the following conclusions: • A good agreement has been found between the results obtained by the developed coupling model and those of the literature. • For the considered space step ratio, the heat propagation in the slab concrete decreases with the increase of the space ratio and the decrease of the time. • The heat propagation in the slab decreases significantly with the increase of the upper layer concrete thickness. • The thermal diffusion increases slightly with the increase of the convective exchange coefficient. • The Reynolds number has a significant effect on the profile of the fluid velocity where its maximum value increases with the increase of this latter. • Finally, it should be interesting to note that the methodology that we have presented here makes it possible to analyze the thermal transient phase during very short times using the current numerical model of the fluid-structure thermal coupling.
Dr OUDRANE ABDELLATIF
Faculté des Sciences et Technologie Université Ahmed Draya d’Adrar
Read the Original
This page is a summary of: Numerical Investigation of Fluid-Structure Thermal Coupling under the Transient Flow Effect, International Journal of Engineering Research in Africa, June 2021, Trans Tech Publications,
DOI: 10.4028/www.scientific.net/jera.54.132.
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