Case Studies in Thermal Engineering ( IF 6.8 ) Pub Date : 2021-11-27 , DOI: 10.1016/j.csite.2021.101675 Somayeh Davoodabadi Farahani , Mohammad Amiri , Behnam Kazemi Majd , Amir Mosavi
Due to the high number of porous media applications in industries, the demands for analyzing the porous medium's flow and heat transfer are rising every day. The present research intends to evaluate the impact of porous media, nanofluid, and magnetic field on heat transfer of a circular channel. Two typical porous arrangements are considered: central configuration and boundary configuration. It is of interest to know the impact of porosity, thickness, permeability, and thermal conductivity ratio in porous media. The working fluid, nanoparticles and porous medium are water, CuO and steel foam, respectively. The results reveal that the heat transfer rate in the central arrangement is more than the boundary arrangement. When the non-dimensional thickness of the porous media is 0.8 in the central arrangement, the heat transfer rate is at its peak. Simultaneously, the minimum happens when the non-dimensional thickness is set to 0.6 in the boundary arrangement. Applying nanofluid and increasing the volume fraction will improve the heat transfer rate. The average heat transfer coefficient is increased when the magnetic field is applied up to the intensity of 0.5 T. Additionally, the maximum heat transfer enhancement is achieved when the thickness is 0.6 in boundary arrangement in the case of applying the magnetic field, which is estimated to be 3–5% more. Modifying the shape of the porous media in the boundary arrangement decreases the heat transfer rate about 7–21%, depending on the shape compared to a homogeneous boundary porous.
中文翻译:
磁场对通道传热的影响:纳米流体流动和多孔层排列
由于多孔介质在工业中的大量应用,对多孔介质流动和传热分析的需求每天都在上升。本研究旨在评估多孔介质、纳米流体和磁场对圆形通道传热的影响。考虑了两种典型的多孔排列:中心配置和边界配置。了解多孔介质中孔隙率、厚度、渗透率和导热率的影响是很有趣的。工作流体、纳米颗粒和多孔介质分别是水、氧化铜和泡沫钢。结果表明,中心布置的传热率大于边界布置。当中心排列的多孔介质无量纲厚度为 0.8 时,传热速率达到峰值。同时,当边界排列中的无量纲厚度设置为 0.6 时,会出现最小值。应用纳米流体并增加体积分数将提高传热率。当施加磁场强度达到0.5 T时,平均传热系数增加。此外,在施加磁场的情况下,边界排列厚度为0.6时实现了最大的传热增强,估计增加 3-5%。改变边界排列中多孔介质的形状会降低约 7-21% 的传热率,这取决于与均匀边界多孔的形状相比。应用纳米流体并增加体积分数将提高传热率。当施加磁场强度达到0.5 T时,平均传热系数增加。此外,在施加磁场的情况下,边界排列厚度为0.6时实现了最大的传热增强,估计增加 3-5%。改变边界排列中多孔介质的形状会降低约 7-21% 的传热率,这取决于与均匀边界多孔的形状相比。应用纳米流体并增加体积分数将提高传热率。当施加磁场强度达到0.5 T时,平均传热系数增加。此外,在施加磁场的情况下,边界排列厚度为0.6时实现了最大的传热增强,估计增加 3-5%。改变边界排列中多孔介质的形状会降低约 7-21% 的传热率,这取决于与均匀边界多孔的形状相比。6 在施加磁场的情况下的边界排列,估计增加了 3-5%。改变边界排列中多孔介质的形状会降低约 7-21% 的传热率,这取决于与均匀边界多孔的形状相比。6 在施加磁场的情况下的边界排列,估计增加了 3-5%。改变边界排列中多孔介质的形状会降低约 7-21% 的传热率,这取决于与均匀边界多孔的形状相比。