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Thermal simulation of a continuous casting process subjected to water-sprays cooling

Hocine Mzad Abdessalam Otmani
Archives of Thermodynamics | 2020 | vol. 41 | No 2 | 185-199 | DOI: 10.24425/ather.2020.133628
Keywords Continuous casting Shear region Water-spray Latent heat Thermal optimization
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Abstract

As in many thermal processing technologies, there is a delicate balance between productivity and quality during ingot cooling process. Higher cooling velocities increase productivity but also create higher temperature gradients inside the ingot. Such a fast cooling does not leave sufficient time to establish the equilibrium within the solid, thus the final metal structure is strongly affected by the set up cooling mode throughout the liquid metal solidification. The first intention in this paper is to compare between three cooling modes in order to identify the required mode for a continuous casting process. Then, we study the influence of heat transfer coefficient on metal liquid-to-solid transition through the spray-cooled zone temperature and the metal latent heat of solidification. A gray iron continuous casting process subjected to water-sprays cooling was simulated using the commercial software for modeling and simulating multiphysics and engineering problems. The primary conclusions, from the obtained results, show the forcefulness of water spray cooling regarding standard cooling. Afterward, we highlight the great influence of heat transfer coefficient on the location of transition region as well as the relationship between heat transfer coefficient, wall outer temperature, latent heat dissipation, and the solidification time.

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Authors and Affiliations

Hocine Mzad
Abdessalam Otmani

Hybrid nano improved phase change material for latent thermal energy storage system: Numerical study

Mohamed Lamine Benlekkam Driss Nehari
Archive of Mechanical Engineering | 2022 | vol. 69 | No 1 | 77-98 | DOI: 10.24425/ame.2022.140410
Keywords phase change material (PCM) latent heat storage melting and solidification thermal energy storage hybrid nano-particles LHTESS
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Abstract

The phase change materials (PCM) are widely used in several applications, especiallyi n the latent heat thermal energy storage system (LHTESS). Due to the very low thermal conductivity of PCMs. A small mass fraction of hybrid nanoparticles TiO 2–CuO (50%–50%) is dispersed in PCM with five mass concentrations of 0%, 0.25%, 0.5%, 0.75% and 1 mass % to improve its thermal conductivity. This article is focused on thermal performance of the hybrid nano-PCM (HNPCM) used for the LHTESS. A numerical model based on the enthalpy-porosity technique is developed to solve the Navier-Stocks and energy equations. The computations were conducted for the melting and solidification processes of the HNPCM in a shell and tube latent heat storage (LHS). The developed numerical model was validated successfully with experimental data from the literature. The results showed that the dispersed hybrid nanoparticles improved the effective thermal conductivity and density of the HNPCM. Accordingly, when the mass fraction of a HNPCM increases by 0.25%, 0.5%, 0.75% and 1 mass %, the average charging time improves by 12.04 %, 19.9 %, 23.55%, and 27.33 %, respectively. Besides, the stored energy is reduced by 0.83%, 1.67%, 2.83% and 3.88%, respectively. Moreover, the discharging time was shortened by 18.47%, 26.91%, 27.71%, and 30.52%, respectively.
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Authors and Affiliations

Mohamed Lamine Benlekkam
1 2
ORCID: ORCID
Driss Nehari
3
ORCID: ORCID
  1. Department of Science and Technology, University of Tissemsilt, Tissemsilt, Algeria
  2. Laboratory of Smart Structure, University of Ain Temouchent, Ain Temouchent, Algeria
  3. Laboratory of Hydrology and Applied Environment, University of Ain Temouchent, Algeria

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