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Analysis for Heat Transfer Enhancement in the Core Flow of A Tube Filled with Porous Media in Different Sections

Author: ZhengYong
Tutor: HuangXiaoMing；MingTingZhen
School: Huazhong University of Science and Technology
Course: Engineering Thermophysics
Keywords: Core flow Heat transfer enhancement Porous media Segments filled Packing density Unit length of the tube PEC
CLC: TK124
Type: Master's thesis
Year: 2009
Downloads: 66
Quote: 0
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Abstract


In energy, electronics, chemical, petroleum, pharmaceutical and other industries, the heat exchangers are indispensable equipment. Heat transfer capacity of the heat transfer equipment, as well as the heat transfer efficiency directly affects the production efficiency of various industries and industrial development. In modern society, on the one hand, the science and technology rapid development, rapid technological products, continuously improve the standard of living and quality of life of human beings, the increasingly strong demand for energy and dependence; On the other hand, the severe shortage of global energy supply, the two formed strong contradiction. Severe energy shortages and lack of constraints the sustainability of the development and progress of human society, not the security of supply of energy, human society would be tremendous resistance develops to a certain stage, a sharp decrease in the pace of development, the final face is stagnant. Therefore, for this goal to improve the heat exchanger and heat transfer efficiency of the heat transfer equipment, heat transfer enhancement technology for long-term, extensive, in-depth study is necessary. In a variety of enhanced heat transfer technology, based on the core flow to enhance the heat transfer philosophy of the tube into the twisted tape enhanced heat transfer technology and fully developed laminar tube flow core flow region partially filled with porous media enhanced heat transfer technology, and traditional heat transfer enhancement measures taken in the fluid boundary region of the two heat transfer enhancement technology is taken for the central area of ??the fluid flow and heat transfer enhancement measures. This article by segment filled with porous media flow fully developed section of the tube pipe inner layer test section of the core flow region and the establishment of a mathematical model of the flow and heat transfer fluid in the pipe, the flow in the tube with laminar fully developed section of core area The test section is filled segments with different packing density enhanced tubes in porous media porous fluid flow and heat transfer numerical simulation and analysis. The numerical results show that: filled the metal porous medium, large temperature gradient boundary flow in the fully developed region of laminar tube flow, the temperature of the core flow is more evenly distributed between the tube wall and the fluid in the tube heat exchanger has been significantly enhanced unit tube length is the same case Sectional filled porous media, the greater the filling density of the porous reinforced the stronger the heat transfer performance of the tube. Additionally, when the packing density of the porous medium is the same, segmented filled porous media, the basic unit of tube length is smaller is better.

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CLC: > Industrial Technology > Energy and Power Engineering > Thermal engineering, heat > Thermal Engineering Theory > Heat Transfer
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