Nuances of Fluid Flow through a Vertical Channel in the Presence of Metal foam/Solid block –A Hydrodynamic Analysis using CFD（审稿）

文献阅读笔记

Abstract

物理模型：

• The physical model comprisesof aluminum plate-heater assembly（组件，这是个noun） placed in the vertical channel.
• High thermal conductivity metal foams are attached to the heater-plate assembly in order to reduce the temperature of the aluminum plates.

关注点：

• The study pays attention only to the characteristics of fluid flow at different positions of the vertical channel in the presence of metal foams.

方法：

• the Forchheirmer -Extended Darcy equation
• local non-thermal equilibrium model

成果：

• Consequently, as a novel approach, the analysis enables to arbitrate the tradeoff between the porous metal foam and the solid block for heat transfer augmentationfrom the plate assembly to the air.
  不得不说我觉得这种鬼结论相当废话。能够仲裁金属泡沫和固体块的折衷，那仲裁的结果是什么？

Introduction

金属泡沫研究：
Calmidi and Mahajan 2000

• experimentally and numerically studied the heat transfer through highly porous metallic foams made of aluminum filled in a horizontal channel and there seems to be excellent agreement between simulations and experiments.
• they proposed important correlations for interfacial terms.(这是个啥？)

Lu（不是卢天健）

• analytical study was proposed on partially filled metal foams to obtain temperature distributions.
• analytical study on partially filled metal foams in a parallelplate symmetrical and asymmetrical channel and statedthat the flow ratio is the implicit parameter for the analysis of partly filled metal foams in a channel.

Shakiba 2011

• experimentally investigated the pressure distribution through ceramic foams for both hot and cold flows. It is reported that as temperature increases the pressure drop decreases at a particular velocity.

温度分布模型：LTE和LTNE
Lin 2016

• both the thermal models produce same thermal results at higher air velocities

Gangapatnam 2017

• LTNE model outperformed(做得更好) the LTE model for the analysis of 20PPI metal foam filled in a channel.
  我还很好奇一篇数值的文章咋知道那个模型好。。打开文章一看尼玛竟然有一个很庞大的实验emmm估计是一系列实验发了一个模拟的文章而已吧。。醉了
  要不我也仿照这个借助徐老师的实验结果做个验证？

Dukhan 2012

• performed analytical and experimental investigationson Brinkman-Darcy flow in the cylindrical coordinate system. The result reports that the friction factor increases and decreases with the viscosity ratio and Darcy number respectively for a given Reynolds number and is inversely proportional to Reynolds number.

Kim 2001

• experimentally concluded that the metal foam with higher pore densities*(PPI)* enhance heat transfer with higher pressure drop filled in asymmetrically heated channel.
  为什么感觉到这里就开始疯狂列参考文献也不管啥关系了。。。

Kamath 2013

• noticed that the increase in heat transfer is only 4% by the use of copper metal foam as opposed to aluminium metal foams.

Liao 2016

• theoretically and experimentally studied the hydrodynamic characteristics through the porous material with respect to heating. They analytically developed pressure drop correlation which is function of porosity, permeability and viscosity as a function of temperature. It is reported that at specific flow rate the increase in temperature causes the increase in pressure drop.(这结论和上面相反的hahahha，不过这个理论解感觉很牛逼啊)

本文创新点：

• the behavior of fluid inside the upstream, porous and downstream region of the channel is still obscure(鲜为人知的) due to the torturous path of the porous media.

• distribution of velocity, pressure drop and excess temperature obtained for different volume filling rates are being discussed extensively.
  考虑的是不同填充率的影响

Problem Domain

volume filling rate: 40% 70%

Numerical Geometry with Boundary Conditions

2 dimensional computational model；

由于对称性，只模拟一半区域；

边界条件：

• 速度入口；
• 压力出口；
• 绝热壁面；
• 恒热流加热面；

工质
工质为空气；
温度为30℃；
不可压缩定常流动；

三种流动被模拟：层流，过渡流，湍流；

求解器：

• Fluent计算；
• Forchheirmer Extended Darcy flow model ；

比较有意思的是，涉及到一些金属泡沫几何和换热的参数。这些参数使用参考文献中公式计算，列如下：

PPI	fiber diameter	pore diameter	porosity	interfical surface area

结语
这篇文章的审稿，来源于我终于第一次投出了第一篇文章。我给老板说的当天他就让我审了这篇稿件，总感觉他是觉得终于可以把这种烂活扔给我了一样。哈哈哈哈也可能是我多想了。让然讽刺的是，那篇文章被拒掉两次，到现在还在我手里。

他给我这个稿子的时候，还说看看有没有能借鉴的。我真不知道该咋说，因为这TM是一篇做宏观模型的文章。如果你问我有没有欠缺还可以做的那还是有的，比如说：

• 只考虑了单相流体，我可以仿照新加坡的文章加入多相（其实就是两相）的影响；
• 只考虑了稳态，我可以看看响应性，比如仿照最近（2019.6）xuhuijin的那个正弦的边界条件；还可以单纯考虑时间上的行为；
• 类似的，可以仔细看一下空间上的行为，分析一下入口效应；
• 这个说白了是研究金属泡沫填充的影响，那么我们可以看看不同的填充方式有没有区别；
• 还有就是金属泡沫参数的影响。这个文章真正做的参数很有限，完全可以看一下ppi和比表面积的影响；

总之，真的要在这个基础上让我做也不是没办法展开。但是，我TM做了两年的pore scale怎么弄？完全不是一个路线的好么？还有脸问我有没有能借鉴的？呵呵。