纳米添加剂对麻疯树甲酯和乙醇混合物蒸发特性的影响  

Effect of Nanoadditives on Evaporation Characteristics of Jatropha Methyl Ester and Ethanol Mixture

作　　者：高建伟 王筱蓉[1] 高吉 孙文强 GAO Jian-wei;WANG Xiao-rong;GAO Ji;SUN Wen-qiang(College of Mechanical Engineering,Jiangsu University of Science and Technology,Zhenjiang 212100,Jiangsu,China)

机构地区：[1]江苏科技大学机械工程学院,江苏镇江212100

出　　处：《新能源进展》2023年第3期289-294,共6页Advances in New and Renewable Energy

基　　金：江苏省研究生创新基金项目(SJCX22_1930)。

摘　　要：采用悬浮液滴技术研究在873 K和973 K的环境温度下,麻疯树甲酯-乙醇混合物(J70E30)添加不同质量浓度的Fe3O4纳米粒子(0.25%、1%、2%)燃料液滴的蒸发特性。结果表明,在873K和973 K两个温度下,含有不同浓度的纳米流体燃料液滴蒸发过程均可以分为瞬态加热阶段、波动蒸发阶段和平衡蒸发阶段,三种Fe3O4纳米粒子浓度液滴的归一化平方直径在平衡蒸发阶段符合d2定律。在873 K温度下,由于纳米粒子较强的布朗运动导致传热效率提高,促进了燃料液滴蒸发速率,其蒸发速率随着纳米粒子浓度增加不断提高;在973K温度下,纳米流体燃料液滴的蒸发速率则是先减小后增大,但在973K温度下纳米流体燃料液滴蒸发速率要大于其在873K时的蒸发速率。The evaporation characteristics of fuel droplets of jatropha methyl ester-ethanol mixture(J70E30)with different mass concentrations of Fe3O4 nanoparticles(0.25%,1%,2%)at ambient temperatures of 873 K and 973 K were studied by using suspension droplet technique.The results showed that at 873 K and 973 K,the evaporation process of nanofluid fuel droplets with different concentrations could be divided into the transient heating stage,fluctuating evaporation stage and equilibrium evaporation stage,and the normalized square diameter of the three droplets conformed to the d2 law at the equilibrium evaporation stage.At 873 K temperature,the strong Brownian motion of nanoparticles led to higher heat transfer efficiency,which promoted the evaporation rate of fuel droplets,and the evaporation rate increased continuously with the increase of nanoparticle concentration.At 973 K temperature,the evaporation rate of nanofluid fuel droplets decreased initially and then increased,but the evaporation rate of nanofluid fuel droplets at 973 K temperature was higher than that at 873 K.

关 键 词：麻疯树甲酯 蒸发特性 纳米流体 d2定律 

分 类 号：TK464[动力工程及工程热物理—动力机械及工程]