石蜡的热膨胀驱动特性
Thermal Expansion Actuated Characteristics of Paraffin
摘 要
为掌握石蜡的热膨胀驱动特性,采用水浴加热石蜡热膨胀特性试验装置研究了石蜡的体膨胀率与温度和压力的关系,压力对热膨胀特性的影响和不同成分石蜡熔点的变化情况.结果表明:当压力在0.36 MPa以下、温度从25 ℃升高到61 ℃时,石蜡的体膨胀率逐渐增大到13.2%,而且在熔点温度附近石蜡下的体膨胀率与温度几乎呈线性规律变化;在采用的弹簧压力下,压力对石蜡的热膨胀特性影响不大;可以根据系统对温度的要求来选择不同熔点的石蜡作为驱动器的热膨胀材料.
体膨胀
压力
熔点
paraffin
volume expansion
pressure
melting point
Abstract
Thermal expansion actuated characteristics of paraffin were tested on apparatus heated by water bath and the relationship of volume expansion vs.temperature and pressure,the influence of pressure on thermal expansion characteristics,and the melting point of binary paraffin mixture were studied.The results indicate that the volume expansion coefficient of paraffin increases and reach 13.2% with the temperature changing from 25 ℃ to 61 ℃ and the pressure below 0.36 MPa,and the characteristic curve is almost linear during the solid-to-liquid phase transformation.The influence of pressure on thermal expansion characteristics of paraffin is very little under the used pressure of spring.The paraffin with different melting points can be selected as the expansive material of paraffin actuator according to the demand of control system.
中图分类号 TQ31
所属栏目 材料性能及其应用
基金项目 江西省自然科学基金资助项目(0650086);江西省教育厅科技计划项目(GJJ08217)
收稿日期 2007/3/15
修改稿日期 2007/6/27
网络出版日期
作者单位点击查看
备注陈兵芽(1974-),男,江西新余人,博士研究生.
引用该论文: CHEN Bing-ya,LIU Ying,SUN Chang-cun. Thermal Expansion Actuated Characteristics of Paraffin[J]. Materials for mechancial engineering, 2008, 32(7): 60～63
陈兵芽,刘莹,孙长存. 石蜡的热膨胀驱动特性[J]. 机械工程材料, 2008, 32(7): 60～63
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参考文献
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【8】Oner Arici.The vehicle engine cooling system simulation:part 1-model development[D].USA:Michigan Technological University,1999.
【9】Dowen D.Design and implementation of a paraffin based micropositioning actuator[J].SPIE,1997,3132:127-134.
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【11】Carlen E T,Mastrangelo C H.Electrothermally actuated paraffin microactuators[J].Microelectromechanical Systems,2002,11(3):165-174.
【12】Dorset D L,Snyder R G.H-D isotope and chain-length dependence of phase separation in quenched n-alkane binary combinations in the crystalline state[J].Macromolecules,1995,28(24):8412-8418.
【13】Nakafuku C,Sugiuchi T.Effect of pressure on the phase diagram of binary mixtures of n-alkanes[J].Polymer,1993,34(23):45-49.
【14】Jin J,Wunderlich B.Heat capacities of paraffins and polyethylene[J].Phys Chem,1991,95(22):9000-9007.
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【16】陈兵芽,刘 莹.石蜡热膨胀性能试验装置的研究[J].传感器与微系统,2007,26(12):60-62.
【17】李树勋.内燃机车柴油机冷却系统蜡式自动恒温阀试验研究[J].流体机械,2006,34(9):4-7.
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【2】Freund M.Paraffin products:properties,technologies,applications[M].Amsterdam:Elsevier,1982.
【3】Bell D J,Lu T J.MEMS actuators and sensors:observations on their performance and selection for purpose[J].Micromech Microeng,2005,15(7):153-164.
【4】Bodén R,Lehto M.A polymeric paraffin actuated high-pressure micropump[J].Sens Actuators A,Phys,2006,A127(1):88-93.
【5】Lee J S,Lucyszyn S.A micromachined refreshable Braille cell[J].Microelectromech Syst,2005,14(4):673-682.Klintberg L,Karlsson M.Fabrication of a paraffin actuator using hot embossing of polycarbonate[J].Sens Actuators A,Phys,2003,A103(3):307-316.
【6】Klintberg L,Svedberg M.A thermally activated-paraffin based actuator for gas-flow control in a satellite electrical propulsion system[J].Sens Actuators A,Phys,2003,A105(3):237-246.
【7】Carlen E T,Mastrangelo C H.Electrothermally actuated paraffin microactuators[J].Microelectromech Syst,2002,11(3):165-174.
【8】Oner Arici.The vehicle engine cooling system simulation:part 1-model development[D].USA:Michigan Technological University,1999.
【9】Dowen D.Design and implementation of a paraffin based micropositioning actuator[J].SPIE,1997,3132:127-134.
【10】Kabei N.A thermal-expansion-type microactuator with paraffin as the expansive material (basic performance of a prototype linear actuator)[J].JSME International Journal Series C,1997,40(4):736-742.
【11】Carlen E T,Mastrangelo C H.Electrothermally actuated paraffin microactuators[J].Microelectromechanical Systems,2002,11(3):165-174.
【12】Dorset D L,Snyder R G.H-D isotope and chain-length dependence of phase separation in quenched n-alkane binary combinations in the crystalline state[J].Macromolecules,1995,28(24):8412-8418.
【13】Nakafuku C,Sugiuchi T.Effect of pressure on the phase diagram of binary mixtures of n-alkanes[J].Polymer,1993,34(23):45-49.
【14】Jin J,Wunderlich B.Heat capacities of paraffins and polyethylene[J].Phys Chem,1991,95(22):9000-9007.
【15】Dirand M,Bouroukba M.Normal alkanes,multialkane synthetic model mixtures,and real petroleum waxes:Crystallographic structures,thermodynamic properties,and crystallization[J].Chem Eng Data,2002,47(2):115-143.
【16】陈兵芽,刘 莹.石蜡热膨胀性能试验装置的研究[J].传感器与微系统,2007,26(12):60-62.
【17】李树勋.内燃机车柴油机冷却系统蜡式自动恒温阀试验研究[J].流体机械,2006,34(9):4-7.
【18】耿跃春.铁磁热籽诱导加热治疗肝癌的实验研究[J].中华理疗杂志,1997,20(1):204-206.
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