| 钟家伦， 李培超.非均匀温度边界下多孔介质太阳能吸热管内非达西强迫对流传热数值研究[J].轻工机械,2018,36(4):30-34 |
| 非均匀温度边界下多孔介质太阳能吸热管内非达西强迫对流传热数值研究 |
| Numerical Simulation of Non Darcy Forced Convection Heat Transfer in Porous Solar Receiver Pipe under Non Uniform Temperature Boundary |
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| DOI：10.3969/j.issn.1005 2895.2018.04.006 |
| 中文关键词: 多孔介质太阳能吸热管 非均匀温度边界 非达西 强迫对流传热 |
| 英文关键词:porous solar receiver pipe non uniform temperature boundary non darcy forced convection heat transfer |
| 基金项目:中石油 中科院重大战略合作项目(2015A 4812) |
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| 中文摘要: |
| 针对太阳能集热器的多孔介质吸热管部件工作时，存在受热不均匀而引起剧烈的温度循环变化和交变热应力所导致吸热管出现疲劳破坏的问题
，开展了三维数值模拟。动量方程采用Brinkman模型，能量方程采用非局部热平衡下的双方程模型。在入口温度非均匀而壁面恒温(工况1)和入口恒温而壁面温度
非均匀(工况2)2种常见工况下，考察多孔介质太阳能吸热管内非达西强迫对流传热过程，并采用无量纲形式对问题进行简化。研究结果表明：无量纲速度参数对
吸热管内对流传热过程影响显著，Bi增大，流体和固体骨架温差减小。通过改变入口和壁面受热条件以及合理的控制参数范围可以有效地降低多孔介
质太阳能吸热管内的最大温差，从而改善吸热管的工作效率，延长使用寿命。 |
| 英文摘要: |
| 3D numerical simulation was carried out for the fatigue failure in a working porous solar receiver pipe because of temperature cyclic change and
alternating thermal stress caused by non uniform heating. The momentum equation was formulated based on the Brinkman model, and the energy equations were established following the
two equation model under non local thermal equilibrium. The non darcy forced convection heat transfer in a porous solar receiver pipe under non uniform entrance temperature but
uniform wall temperature (Case1) and uniform entrance temperature but non uniform wall temperature (Case2) boundary condition was investigated. The numerical results show that the
parameters of dimensionless velocity field have distinct effect on the convection heat transfer process, the temperature difference between fluid and solid phases decreases with Bi
number increases. [JP2]Changing the heating conditions of entrance and wall and controlling the range of parameters reasonably can decrease the maximal temperature difference in
porous solar receiver pipe effectively, which can improve the working efficiency of porous solar receiver pipe and extend its service life. |
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