| 郭亚丽,秦道洋,沈胜强,徐鹤函.纳米流体强化换热特性的LBM模拟[J].,2013,53(1): |
| 纳米流体强化换热特性的LBM模拟 |
| Simulation of nanofluid heat transfer enhancement characteristics with lattice Boltzmann method |
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| DOI：10.7511/dllgxb201301007 |
| 中文关键词: 纳米流体 强化换热 体积分数 浮升力参数 |
| 英文关键词: nanofluid heat transfer enhancement volume fraction buoyancy parameter |
| 基金项目:国家自然科学基金资助项目(50906005). |
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| 摘要点击次数: 1159 |
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| 中文摘要: |
| 采用LBM模拟了封闭方腔内不同体积分数、不同浮升力参数下纳米流体自然对流时速度场与温度场的分布,得出了纳米流体换热强度随各参数的变化情况．结果表明,当 Ra 较小时换热表现为导热占主导,随着 Ra 增大,换热表现为对流占主导,两者的换热都会随着纳米颗粒体积分数的增加而增强,且纳米颗粒体积分数在壁面附近对温度分布的影响比在中心区域的明显；在不同 Ra 下,纳米粒子体积分数增加所引起的 X和Y 方向速度峰值增大的幅度不同, Ra 较大时,随纳米粒子体积分数的增加, X和Y 方向的速度峰值大幅增加． |
| 英文摘要: |
| The streamlines and isotherms in a closed cavity are simulated for nanofluid natural convection with lattice Boltzmann method at different nanoparticles volume fractions and different buoyancy parameters. The heat transfer intensity of nanofluid changing with the parameters is obtained. The experimental results show that conduction dominates the heat transfer process when Rayleigh number is smaller, while at larger Rayleigh number convection dominates the process. In either condition the heat transfer will be enhanced with the rise of nanoparticles volume fraction. And near the wall the nanoparticles volume fraction has more obvious effect on the isotherms than in the core region. At different Rayleigh numbers, nanoparticles volume fraction has different effects on the velocity peak values in X and Y directions. When Rayleigh number is larger, the velocity peak values in X and Y directions will increase markedly with rise of nanoparticles volume fraction. |
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