首页> 外文会议>ASME summer heat transfer conference;HT2009 >SIMULATION OF HEAT TRANSFER IN MOVING GRANULAR MATERIAL BY THE DISCRETE ELEMENT METHOD WITH SPECIAL EMPHASIS ON INNER PARTICLE HEAT TRANSFER
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SIMULATION OF HEAT TRANSFER IN MOVING GRANULAR MATERIAL BY THE DISCRETE ELEMENT METHOD WITH SPECIAL EMPHASIS ON INNER PARTICLE HEAT TRANSFER

机译:颗粒物内部传递的离散元离散元法模拟运动颗粒材料中的传热

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Physical processes involving static or dynamic granularassemblies are best modeled on the particle scale by DiscreteElement Methods (DEM) rather than continuum approaches.Due to the high computational effort of DEM simulations,present studies assume the inner particle temperature to bespatially uniform and neglect the inner particle heat transfer.For this reason the Radial Temperature Model was introducedIt assumes radial temperature distributions within theparticles and is based on an analytical solution of the heatconduction equation in a spherical particle.The scope of this paper is to present the furtherdevelopment of the Radial Temperature Model that allows tosimulate granular systems of particles of different sizes andmaterials, enabling the use of DEM in various applications.The contact heat transfer is modeled making additionalmaterial-specific data unnecessary. It is shown that a verygood accuracy for the contact heat transfer between differentspherical particles is achieved for binary contacts. DEMsimulations were performed using the Radial TemperatureModel and uniform particle temperatures, respectively. Theresults demonstrate that the Radial Temperature Model thathas been developed and incorporated in the Discrete ElementMethod allows for an improved calculation of the transientthermal behavior of granular assemblies even for largenumbers of particles.
机译:涉及静态或动态粒度的物理过程 最好通过Discrete在粒子尺度上对装配进行建模 元素方法(DEM)而不是连续方法。 由于DEM仿真的计算量很大, 目前的研究假设内部颗粒温度为 在空间上均匀并且忽略了内部粒子的传热。 因此,引入了径向温度模型 假设径向温度分布在 颗粒,并基于热量的解析解 球形粒子中的传导方程。 本文的范围是进一步介绍 径向温度模型的开发,允许 模拟不同大小的粒子的颗粒系统,并 材料,可在各种应用中使用DEM。 对接触传热进行了建模,从而增加了 不需要特定于材料的数据。它显示了一个非常 对于不同之间的接触传热具有良好的精度 球形颗粒实现了二元接触。 DEM 使用径向温度进行模拟 分别模拟颗粒温度和均匀颗粒温度。这 结果表明,径向温度模型 已开发并纳入离散元素 方法可以改进瞬态的计算 粒状组件的热行为,即使对于大型 粒子数。

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