Abstract

A numerical study on mixed convection is carried out through a partially filled brass wire mesh in a vertical channel. A heater embedded with aluminum plates is placed at the center of the vertical channel. The aluminum heater assembly is wrapped with brass wire mesh to facilitate more heat transfer. The vertical channel that consists of aluminum heater assembly with the brass wire mesh is considered as the numerical model. Local thermal non-equilibrium and Darcy extended Forchheimer models are used to accomplish the numerical simulations for thermal and flow characteristics of the considered domain. The aim of the study is to find out the optimum filling of the brass wire mesh in the channel which gives a higher heat transfer rate with low pumping power of the fluid. In the present analysis, three different filling conditions of wire mesh are considered: (i) fully filled channel, (ii) 70% filled channel, and (iii) 40% filled channel. From the results, it is inferred that the vertical channel partially filled with 70% of wire mesh porous medium predicts 89% of heat transfer of the completely filled channel with 41% reduced pressure loss. As a result, the proposed parametric study is good enough to prove that the partly filled wire mesh can be used in the thermal applications where augmentation of heat transfer is required with less pressure drop.

摘要

通过垂直通道中部分填充的黄铜丝网对混合对流进行了数值研究。嵌入铝板的加热器放置在垂直通道的中心。铝加热器组件用黄铜丝网包裹，以促进更多的热传递。由带有黄铜丝网的铝加热器组件组成的垂直通道被视为数值模型。局部热非平衡和达西扩展 Forchheimer 模型用于完成所考虑域的热和流动特性的数值模拟。研究的目的是找出通道中黄铜丝网的最佳填充方式，以提供更高的传热率和低的流体泵送功率。在目前的分析中，考虑了丝网的三种不同填充条件：(i) 完全填充的通道，(ii) 70% 填充的通道，和 (iii) 40% 填充的通道。从结果推断，部分填充 70% 丝网多孔介质的垂直通道预测完全填充通道的传热率为 89%，压力损失降低 41%。因此，建议的参数研究足以证明部分填充的金属丝网可用于需要增强传热且压降较小的热应用。