均匀磁场下双层磁流体泡沫结构转变的研究
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- 英文论文题名：Research on Structural Transformation of Bilayer Ferro-foams under Homogeneous Magnetic Field
- 论文作者：李福阳 ; 王松宝 ; 董华乔 ; 郭加宏 ; 雷作胜
- 英文论文作者：LI fuyang ; WANG songbao ; DONG huaqiao ; GUO jiahong ; LEI zuosheng ; State Key Laboratory of Advanced Special Steel & Shanghai Key Laboratory of Advanced Ferrometallurgy &School of Materials Science and Engineering ; Shanghai University ; Shanghai Institute of Applied Mathematics and Mechanics ; Shanghai University
- 年：2016
- 作者机构：省部共建高品质特殊钢冶金与制备国家重点实验室&上海市钢铁冶金新技术开发应用重点实验室&上海大学材料科学与工程学院;上海市应用数学和力学研究所;
- 论文关键词：蜂窝结构 ; Tóth结构 ; 结构转变 ; 磁相互作用势能
- 英文论文关键词：Honeycomb structure ; Toth structure ; Structural Transformation ; Magnetic Interactive Potential Energy
- 会议召开时间：2016-08-15
- 会议录名称：第三届全国电磁冶金与强磁场材料科学会议学术论文集
- 语种：中文
- 分类号：TB383.4
- 学会代码：ZGJS
- 会议名称：第三届全国电磁冶金与强磁场材料科学会议
- 会议地点：中国河南焦作
- 主办单位：中国金属学会电磁冶金与强磁场材料科学分会
- 学会名称：中国金属学会
- 页数：5
- 文件大小：1147k
- 原文格式：O
- 会议级别：全国
摘要
双层单分散泡沫材料,作为一种具有独特孔隙结构的多孔泡沫材料,在材料性能方面有着明显的优势,应用前景巨大。构成双层单分散泡沫结构的基本单元分为两种,一种是广泛存在于自然界的蜂窝结构单元,另一种是1964年发现的Tóth结构单元。有研究表明,通过改变泡沫液相分数,可以实现这两种结构之间的可逆转变。受此启发,本文以磁流体泡沫为研究对象,基于能量最小化原理,采用单对亥姆霍兹线圈提供的均匀磁场,对双层泡沫结构自组织调控行为进行了研究。结果表明,无磁场时双层磁流体泡沫Tóth结构单元和蜂窝结构单元的临界转变液相分数为28%。通过施加均匀磁场,实现了基于磁场能量改变触发的双层泡沫结构转变。并且通过比较可知双层磁流体泡沫结构转变的临界液相分数提前了8-9%。并对其结构转变机制进行了理论分析。本文提出的这种方法对工业化生产具有优质孔隙结构的双层蜂窝板材具有重要的参考意义。
As a porous foam material,bilayer monodisperse foam material has a unique pore structure.In terms of material properties,it has a distinct advantage and great application prospects.Monodisperse bilayer foams are composed of two foam units,which are honeycomb structure found in nature widely and Toth structure found in 1964.Previous researches have proved that these two structures can transform into each other by changing liquid fractions.Inspired by this,ferro-foam,as the sample of our expriment,is placed in homogeneous magnetic field,which is generated by Helmholtz double coils.And self-organizing structural transformation of bilayer ferro-foam is investigated in this paper.The result shows foam transformation critical value is found at 0.28 when put horizontally.When a homogeneous magnetic field is applied,bilayer foams at a specific liquid fraction can also perform this transformation.And foam transformation critical value is advanced 8-9%.Besides,we have given this phenomenon a possible explanation in the view of magnetic interactive potential energy.This method has an important reference for the industrial production of high-quality bilayer foam slab,which has a better cellular pore structure than that of current market.
As a porous foam material,bilayer monodisperse foam material has a unique pore structure.In terms of material properties,it has a distinct advantage and great application prospects.Monodisperse bilayer foams are composed of two foam units,which are honeycomb structure found in nature widely and Toth structure found in 1964.Previous researches have proved that these two structures can transform into each other by changing liquid fractions.Inspired by this,ferro-foam,as the sample of our expriment,is placed in homogeneous magnetic field,which is generated by Helmholtz double coils.And self-organizing structural transformation of bilayer ferro-foam is investigated in this paper.The result shows foam transformation critical value is found at 0.28 when put horizontally.When a homogeneous magnetic field is applied,bilayer foams at a specific liquid fraction can also perform this transformation.And foam transformation critical value is advanced 8-9%.Besides,we have given this phenomenon a possible explanation in the view of magnetic interactive potential energy.This method has an important reference for the industrial production of high-quality bilayer foam slab,which has a better cellular pore structure than that of current market.
引文
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[2]Peterson I.The honeycombconjecture[J].Science News,1999,156(4):60.
[3]华罗庚.谈谈与蜂房结构有关的数学问题[M].北京:科学出版社,2002.
[4]Toth LF.What the bees know and what they do not know[J].Bull Am Math Soc,1964,70(4):468-481.
[5]WeaireD,Phelan R.Optimal design of honeycombs[J].Nature,1994,367:123.
[6]Hohler R,Yip Cheung Sang X Lorenceau E et al.Osmotic pressure and structures of monodisperse ordered foam[J].Langmuir,2008,24(2):418-425.
[7]Hutzler S,Weaire D,Elias F et al.Juggling with bubbles in cylindrical ferrofluid foams[J].Philosophical Magazine Letters,2002,82(5):297-301.
[8]Pittet N,Rivier N and Weaire D.Cylindrical packing of foam cells[J].Forma,1995,10(1):65-73.
[9]Boyer F and Falcon E.Wave turbulence on the surface of a ferrofluid in a magnetic field[J].Physical review letters,2008,101(24):244502.
[10]程建生,吴洪莉,陈义成.两磁偶极子间的相瓦作用力的一种计算方法[J].华中师范大学研究生学报,2005,2:043.