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|  | | 为了更好的帮助您理解掌握查询词或其译词在地道英语中的实际用法,我们为您准备了出自英文原文的大量英语例句,供您参考。 | |
Due to viscous heating spontaneous ignition of a supersonic flow of premixed combustible gases can occur in boundary layers.
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Calculations are carried out of the dynamic forces and viscous heating when a layer of Newtonian liquid at the bottom of a rigid container is extruded through a matrix in the form of a circular opening or a narrow slit.
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One barrier to the attainment of a crystalline ordered state for a well-cooled beam in a storage ring will be the viscous heating by the shear induced in the bending fields of the ring.
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At low values of Brinkman number (Br~0.1), the cooling effect dominates over viscous heating in the entrance region.
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Comparisons with the solution in the absence of viscous heating are performed.
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| | critical detonation stability for two-dimensional perturbations is discus-ed by meansof thermodynamic theory of dissipative structures and perturbs tion method.Except viscosity,transport properties (such as heat conduction,diffusion,radiation etc.) are neglected.The stability criteria of detonation combustion zones is given for viscid fluids and inviscid fluids respectively.We use Arrhenius reaction rate law and consider exothermic chemical reactions.The rate increases when the temperature raises.In the cas... | | 本文应用耗散结构热力学理论和微扰的方法,研究临界爆轰波对二维扰动的稳定性问题。在忽略粘性、热传导、浓度扩散、外力和交叉效应的情况下,作出了扰动在爆轰波结构内传播的稳定性判据。对Arrhenius反应率,当化学反应活化能E大于某一临界值E_c之后,对反应率随温度增加而增加的放热反应,临界爆轰波对二维扰动是不稳定的,扰动的振幅在反应燃烧区内随时间的增加而增长,直至扰动最后离开爆轰波结构进入波后产物区。当考虑了粘性的影响之后,扰动振幅的增长和衰减依赖于扰动本身的频率,在反应放热量超过某临界值后,频率愈小亦即扰动波长愈长的扰动振幅,随时间增长愈快,以致最长波长的扰动增长掩盖了其它波长的扰动,或者只有最长波长的扰动振幅维持不变,其它波长的扰动振幅都逐渐衰减,最后形成有规则的螺旋爆轰波。所得结果当忽略化学反应以及粘性对扰动传播相速度的微小影响之后,结论与N.Monson和J.A.Fay等所作的声波理论结果相一致,比较成功地解释了螺旋爆轰的一些实验现象。 | | 文摘来源 | | An unsaturated tertiary ammonium/acrylamide copolymer as acid gelling agent, VY 101, is synthesized and VY 101 gelled hydrochloric acidizing fluids are formulated and evaluted in laboratory extensively. In 15 28% hydrochloric acids, VY 101 is highly compatible with a series of commonly used commercial acid additives, including corrosion inhibitors, ferroferric ions and clay slabilizers, and backflow aids. The gelled acids prepared are heat and shear resistant, have satisfactory rheologic characteristic... | | 根据深度酸化的需要,研制出了VY101阳离子型高分子稠化剂,并提出了以VY101为稠化剂的稠化酸液配方。本文考察了VY101稠化剂及稠化酸液的综合性能,结果表明,VY101在盐酸中溶解性好,具有很好的增粘性、热稳定性和抗剪切性,有一定的防止粘土膨胀的作用,与常用的酸液添加剂配伍性好;由VY101配成的稠化酸与岩石的反应速度慢,泵送阻力小,是一种性能良好的深度酸化工作液。 | | 文摘来源 | | The studies on the heat transfer characteristics and mechanism of solidliquid phase change are one of the frontiers of heat and mass transfer areas. There are specific feature and complicated nature in the problem of the contact melting of phase change materials (PCM). This paper gives a comprehensive review on the research advances in the study of contact melting of PCM during the last eighteen years. With respect to the contact melting, there are diverse contact region geometrics. The shapes of the melti... | | 研究固液相变过程的传热特性与机理,是当前传热传质学的重要课题之一,而相变材料的接触熔化问题有其自身的特殊性和复杂性.文中回顾了近18年来有关加热体与固体相变材料表面间接触熔化的研究,对这一领域的研究发展状况作一述评,并简要介绍作者最近取得的一些成果.内容包括各种形式的接触熔化,可归纳为:在接触形状上可以有凹、凸与平的面,而接触的周长可以是矩形、圆形、椭圆形、抛物线形与弧形曲线;相对运动的类型有固体相变材料在加热容器内熔化,加热体通过熔化固体介质的运动,滑动接触与滚、转动接触;引起接触熔化的原因有温差、压力差、摩擦与粘性热. | | 文摘来源 | |   | | << 更多相关文摘 |
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