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ABSTRACT
Porous materials are widely used in porous media filtration, membrane separation, catalyst substrates, solid fuel cells, insulation, and other fields. When the porous material used in the field of insulation, heat transfer characteristics become its most important performance parameters. The heat transfer characteristics of porous material is a complex issue affected not only by solid elements and porosity, it is also affected by composite structures. Therefore, how to optimize the heat transfer properties of porous materials is a problem to be urgently solved. In this paper, the numerical method is used to study the effects of pore size, pore shape, pore connectivity, porosity and so on. It is found that pore shape, pore connectivity and gas conductivity have great impacts on the heat transfer of porous materials. The effect of pore arrangement is very little. The design optimization of porosity is affected by porous material mechanical property.
Acknowledgements
This Project is supported by the National Natural Science Foundation of China, No. 51406072. It is also supported by the Natural Science Foundation of Gansu Province, China (Grant No. 1606RJZA211).
Nomenclature
| AB | = | left boundary of cell |
| AD | = | top boundary of cell |
| BC | = | bottom boundary of cell |
| cp | = | specific heat (kJkg−1K−1) |
| DC | = | right boundary of cell |
| h | = | convective heat transfer coefficient (Wm−2K−1) |
| K | = | thermal conductivity (Wm−1K−1) |
| Lx | = | length along the x axis (m) |
| Ly | = | height along the y axis (m) |
| n | = | normal direction |
| q | = | heat flux (Wm−2) |
| rx | = | random number along the x axis |
| T | = | temperature (K) |
| Vp | = | volumetric fraction of pore |
| x, y | = | coordinates (m) |
| x0 | = | coordinate of filler center (m) |
| y0 | = | coordinate of filler center (m) |
Greek symbols
| β0 | = | orientation angle (°) |
| ρ | = | density (kg/m3) |
Subscripts
| b | = | bottom |
| c | = | porous composite |
| f | = | ambient |
| g | = | gas |
| t | = | top |
| p | = | pore |
| m | = | polymer matrix |
Additional information
Notes on contributors
Xiaojian Wang
Xiao-Jian Wang is an associate professor at Lanzhou Jiaotong University (Lanzhou, China). He received his doctor's degree in chemical engineering from South China University of Technology, China, in 2013. He studied at Hunan University, China, where he obtained his Master degree in 2010. His research interests are in high conductive composite materials, modeling of the filled composite materials and fouling mechanism.
Haihan Liu
Hai-Han Liu is a postgraduate student in the School of Chemistry and Bioengineering at Lanzhou Jiaotong University (Lanzhou, China). He works on high conductive composite materials, modeling of the filled composite materials and fouling mechanism. He obtained his bachelor's degree in 2015 from the Dalian Ocean University (Dalian, China), where he learned about chemical engineering.
Liangcheng Wang
Liang-Chen Wang is a Professor at Lanzhou Jiaotong University (Lanzhou, China). He received his doctor's degree in Polymer Physical Chemistry from Northwest Normal University in China in 2008. He has worked as a technician, assistant engineer, engineer and project manager in PetroChina Lanzhou Branch for ten years and has rich experience in production and engineering design. He has worked with mass transfer, heat transfer and reaction engineering in chemical process since 1991. He has published more than 10 SCI papers in international journals and obtained 5 patents in water treatment.
Baoyong Liu
Bao-yong Liu is a lecturer at Lanzhou Jiaotong University (Lanzhou, China) and a doctoral candidate at the University of Chinese Academy of Sciences (Beijing, China). He received his master's degree in chemical engineering from China University of Petroleum (East China) in 2008. He obtained his bachelor's degree from Shandong University, China, in 2003. His research interests include carbon nanomaterials and related composite, tribology, and fluidization.
Liangbi Wang
Liang-Bi Wang is a Professor at Lanzhou Jiaotong University (Lanzhou, China). He received his doctor's degree in Engineering Thermophysics from Xi′an Jiaotong University in China in 1996. He conducted his program fellow in Japan′s National Institute of Technology from 2001–2002. He is now the director of Key Laboratory of Railway Vehicle Thermal Engineering of Education Ministry. He has worked with heat exchanger, heat and mass transfer, and advanced heat transfer technologies since 1996. He has published more than 100 SCI papers in international journals and obtained 20 patents in heat exchanger manufacturing.