Journal
ENERGY CONVERSION AND MANAGEMENT
Volume 105, Issue -, Pages 206-215Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.enconman.2015.07.064
Keywords
Gradient porous materials (GPM); Heat transfer enhancement; Fluid flow; Velocity profiles; Numerical simulation
Categories
Funding
- National Natural Science Foundation of China [51373153]
- National Basic Research Program of China [2015CB057301]
- Zhejiang Leading Team of ST Innovation [2011R50005]
- China Scholarship Council [201406320096]
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A novel design of a GPM-filled pipe structure was proposed to improve the heat transfer and reduce pressure drop of fluid flowing through the pipes filled with gradient porous materials. The pore-size gradient and porosity gradient were studied for both partially and fully filled configurations. The effects of GPMs on the fluid flow and heat transfer in the pipes were investigated and compared with the those under the conditions of non-porous materials and homogeneous porous materials (HPMs) serving as controls. Some typical GPM configurations were studied with Rp = 0.6 and Rp = 1.0, showing an enhanced heat transfer and a relatively low friction factor can be reached in comparison with the controls. An attempt was made to illustrate the mechanism of heat transfer enhancement with the field synergy theory. Velocity-based average pore-size was introduced to explain the reduction in friction factors in GPM configurations. A tradeoff analysis between pressure drop and heat transfer enhancement was made based on performance evaluation criteria (PEC). (C) 2015 Elsevier Ltd. All rights reserved.
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