| 圆环腔内纳米流体自然对流的数值研究 |
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| 引用本文： | 王文龙,徐旭,王宇飞,范利武,俞自涛.圆环腔内纳米流体自然对流的数值研究[J].中国计量学院学报,2013,24(1):19-24. |
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| 作者姓名： | 王文龙 徐旭 王宇飞 范利武 俞自涛 |
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| 作者单位： | 1. 中国计量学院计量测试工程学院,浙江杭州,310018
2. 浙江大学能源工程学系,浙江杭州,310027 |
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| 基金项目： | 国家自然科学基金资助项目，中国博士后科学基金资助项目 |
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| 摘 要： | 采用Fluent软件对圆环封闭腔内的Ag-水纳米流体自然对流传热进行数值模拟,着重分析在不同瑞利数下Ag纳米颗粒的添加量和圆环内外壁半径比对圆环传热性能的影响.研究结果表明,随着瑞利数的增加,圆环间的换热强度不断加剧,换热由热传导逐渐向对流转变.添加纳米颗粒降低了换热性能,且随着颗粒浓度的增加换热效果不断恶化;同时,圆环半径比对换热有很大的影响,对一定的瑞利数而言随着半径比的减小,换热性能逐渐增强,且增大的趋势越来越显著.
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| 关 键 词： | 纳米流体 数值模拟 圆环 自然对流 |
Natural convection heat transfer in concentric annuli with nanofluids |
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| Wang Wenlong
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Xu Xu
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Wang Yufei
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Fan Liwu
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Yu Zitao.Natural convection heat transfer in concentric annuli with nanofluids[J].Journal of China Jiliang University,2013,24(1):19-24. |
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| Authors: | Wang Wenlong Xu Xu Wang Yufei Fan Liwu Yu Zitao |
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| Affiliation: | 1.College of Metrology and Measurement Engineering,China Jiliang University,Hangzhou 310018,China; 2.Institute of Thermal Science and Power Systems,Zhejiang University,Hangzhou 310027,China) |
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| Abstract: | Natural convection in horizontal annuli with Ag-water nanofluids was investigated by a numerical study.And particle volume fraction and the ratio of annuli were studied for the evaluation of heat transfer properties in the annulus.It was observed that heat transfer performance increased and heat transfer in natural convection changed from conduction to convection with an augmentation of Rayleigh number.The average Nusselt number was reduced with the increase of the nanoparcticles volume fraction.It became more significant at higher particle volume fraction.The average Nusselt number has decreased with the augmentation of the radius ratio,especially at low radius ratio. |
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| Keywords: | nanofluids numerical study annuli natural convection |
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