Magneto-convection flow of Nano-encapsulated phase change material (NEPCM) confined within a trapezoidal porous enclosure

Q1 Chemical Engineering
Aissa Abderrahmane , Houssem Laidoudi , Abdeldjalil Belazreg , Obai Younis
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Abstract

This research attempts to study the thermal activity of suspension consisting of water and NEPCM elements inside a cavity with a trapezoidal cross-section. In addition, the cavity center contains a cold circular object rotating at a constant speed. The cavity is thermally characterized by the following: the upper and lower walls are thermally insulated (adiabatic), while the two lateral walls have a high temperature. The purpose of this study is to find out how the suspension interferes with the transfer of heat from hot walls to the cold body through the intervention of some initial conditions, which are: The effects of rotating cylinder speed (Re = 1 -500), medium permeability (Da = 10–5 – 10–2) and the magnetic field strength (Ha= 0 -100). The study used a digital simulation by solving the differential equations related to fluid mechanics and heat transfer using the Galerkin finite element (GFEM) method.to understand the influences of studied parameters (Re, Da and Ha numbers), the contours of isotherms, heat capacity and pathlines are presented in terms of these parameters. The findings indicated that as the rotation speed of the obstacle increased, the forced convection became dominant, and the thermal transmission rate improved. The improvement of the thermal transfer rate was also observed for higher Da numbers. Increasing the strength of the magnetic field hiders the fluid motion and reduces the thermal activity. At the highest studied Re, increasing Da from 10 to 5 to 10–2 augmented the Nusselt number by 10 times, while augmenting Ha from 0 to 100 reduced the Nu by 46 %.

封闭在梯形多孔外壳内的纳米封装相变材料(NEPCM)的磁对流
本研究试图研究由水和 NEPCM 元件组成的悬浮液在梯形横截面空腔内的热活动。此外,空腔中心还包含一个以恒定速度旋转的冷圆形物体。空腔的热特征如下:上下壁隔热(绝热),而两个侧壁温度较高。本研究的目的是通过一些初始条件的干预,了解悬浮液如何干扰热壁向冷体的热量传递,这些初始条件包括气缸旋转速度(Re = 1 -500)、介质磁导率(Da = 10-5 - 10-2)和磁场强度(Ha= 0 -100)的影响。为了解所研究参数(Re、Da 和 Ha 数)的影响,研究采用了数字模拟方法,利用 Galerkin 有限元 (GFEM) 方法求解了与流体力学和传热相关的微分方程。研究结果表明,随着障碍物旋转速度的增加,强制对流成为主导,热传导率得到改善。Da 数越高,热传导率越高。增加磁场强度会阻碍流体运动,降低热活性。在研究的最高 Re 值下,Da 从 10 至 5 增加到 10-2 时,努塞尔特数增加了 10 倍,而 Ha 从 0 增加到 100 时,努塞尔特数减少了 46%。
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来源期刊
International Journal of Thermofluids
International Journal of Thermofluids Engineering-Mechanical Engineering
CiteScore
10.10
自引率
0.00%
发文量
111
审稿时长
66 days
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