| 循环流态化自动清洗式换热器的传热强化 |
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| 引用本文： | 俞天兰,刘桂英,李桂芳,任卫红. 循环流态化自动清洗式换热器的传热强化[J]. 热科学与技术, 2006, 5(3): 227-230 |
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| 作者姓名： | 俞天兰 刘桂英 李桂芳 任卫红 |
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| 作者单位： | 湖南工业大学,清洗研究所,湖南,株洲,412008;湖南工业大学,清洗研究所,湖南,株洲,412008;长沙理工大学,机械工程学院,湖南,长沙,410076;长沙华海节能装备公司,湖南,长沙,410000 |
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| 基金项目： | 国家九五重点推广计划项目(96050403A)，湖南省教育厅资助项目(03C596) |
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| 摘 要： | 液-固流态化传热强化的机理尚未完全清楚,已有文献对流态化粒子的粒度与传热系数的影响关系有较大分歧。从传热强化角度对水-沙流态化自动清洗的运行参数进行优化试验研究,得到的结果是:沙子粒度不是愈细愈好,而是D p 2mm(8目)左右为好;粒子体积分数以2.4%比较好;流速在0.2~0.28 m/s(R e为6 000~9 000)较好。虽然粒子体积分数低,但是在优化条件下的流态化传热强化幅度几乎可以达到一倍左右,并且阻力又很低。
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| 关 键 词： | 流态化 传热强化 粒子体积分数 粒子粒度 流速最佳化 |
| 文章编号： | 1671-8097(2006)03-0227-04 |
| 收稿时间： | 2005-09-08 |
| 修稿时间： | 2006-07-01 |
Heat transfer enhancement of self-cleaning heat exchangers of fludization |
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| YU Tian-lan,LIU Gui-ying,LI Gui-fang,REN Wei-hong. Heat transfer enhancement of self-cleaning heat exchangers of fludization[J]. Journal of Thermal Science and Technology, 2006, 5(3): 227-230 |
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| Authors: | YU Tian-lan LIU Gui-ying LI Gui-fang REN Wei-hong |
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| Affiliation: | 1. Mech. Clean Inst. , Hunan Polytechnic Univ. , 412008, China; 2. School of Mech. Eng., Changsha Sci. and Tech. Univ., 410076, China; 3. Huahai Saving Energy Equip. Ltd. Co. , Changsha 410000, China |
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| Abstract: | The mechanism of heat transfer enhancement of liquid-solid fluidization is not clear yet.There are many different views on the relationship between the particles size and heat transfer coefficient in the present documents.From the point view of heat transfer enhancement,the optimum experimental study of operation parameters was studied.Results indicate that heat transfer coefficient is not always increased when the particle size is decreased.The size of Dp 8mm is the best.The optimal volume density of particles is 2.4%.The optimal range of flowing velocity is form 0.2 m/s to 0.28 m/s(Re=6 000~9 000).The heat transfer enhancement is as great as nearly 100% and the total resistance is low under the above conditions. |
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| Keywords: | fluidization heat transfer enhancement volume density particles size velocity optimization |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
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