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首页> 外文期刊>International journal of non-linear mechanics >An extended quasi two-phase mass flow model
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An extended quasi two-phase mass flow model

机译：扩展的准两相质量流模型

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Employing a physics-based full dimensional two-phase mass flow model (Pudasaini, 2012), we construct an extended quasi two-phase bulk mixture model for a debris flow as a mixture of non-Newtonian viscous fluid and solid particles down a channel. The newly derived model is a set of highly non-linear, coupled mass and momentum balance equations together with virtual mass force induced extended pressure Poisson equation. The model includes mechanically very important first order, and novel effects of drag, virtual mass force and mobility of the fluid at the interface with solid particles in the mixture flow. These aspects were not included in the previous simple bulk mixture models. We demonstrate that these new mechanical aspects of drag, virtual mass and mobility play dominant role in the mass flow dynamics; as seen in the extended inertial coefficients, mixture viscosities, mixture and phase velocities and pressure. This shows that we must retain these effects to obtain physically more accurate results for wider application potential. There are additional contributions to the mixture viscosity due to mobility and diffusion of mass fluxes. Diffusion process seem to be much more complex for the bulk mixture flow than for the two-phase flow. The new extended model leads to the exclusive emergence of diffusion and anti-diffusion fluxes and the associated diffusion- and anti-diffusion viscosities, and mass flux enhancement. The system could be diffusion only or, simultaneously could also include important anti-diffusion process. Comparison between the diffusion and anti-diffusion viscosities reveals fundamentally different mechanical processes in mixture mass flows. Typically, anti-diffusion process is pronounced for higher solid fraction. Furthermore, the main mechanics governed by the extended mixture viscosity, and dynamical variables (mixture pressure and velocities) are all controlled by the drag, virtual mass and mobility. The drag intensity in bulk mixture flow appears to be much more sensitive and non-linear than in the two-phase flow. The new model that retains several important physics of two-phase mass flow is expected to simulate mixture velocities and pressure much faster than the two-phase flow model, but physically more accurate than the previous simple mixture flow models. The two-phase dynamics can be reconstructed with the velocity and pressure drifts. Model solutions are extensively presented and discussed for extended inertial coefficients, drag intensities, mass flux enhancement, incipient and depositional processes, mixture viscosity, and diffusion and anti-diffusion processes. This shows the realistic application potential of the new extended model.
机译：利用基于物理学的全维两相质量流模型（Pudasaini，2012），我们为泥石流构建了扩展的准两相本体混合物模型，该混合物是非牛顿粘性流体和固体颗粒沿通道的混合物。新推导的模型是一组高度非线性的，耦合的质量和动量平衡方程，以及虚拟质量力引起的扩展压力泊松方程。该模型包括机械上非常重要的一阶，以及与混合物流中的固体颗粒交界处的流体的阻力，虚拟质量力和流动性的新颖影响。这些方面未包含在以前的简单的批量混合物模型中。我们证明了阻力，虚拟质量和运动性的这些新的机械方面在质量流动力学中起着主导作用。从扩展的惯性系数，混合物粘度，混合物和相速度和压力可以看出。这表明我们必须保留这些效应，以获得物理上更准确的结果，以具有更大的应用潜力。由于质量通量的迁移和扩散，对混合物粘度还有其他贡献。对于整体混合物流，扩散过程似乎要比两相流复杂得多。新的扩展模型导致出现了扩散和反扩散通量以及相关的扩散和反扩散粘度以及质量通量增强的独家现象。该系统可以仅是扩散的，或者同时也可以包括重要的反扩散过程。扩散和反扩散粘度之间的比较揭示了混合物质量流中根本不同的机械过程。通常，对于较高的固体分数，抗扩散过程非常明显。此外，主要的力学因素受扩展的混合物粘度控制，而动力学变量（混合物压力和速度）全部由阻力，虚拟质量和流动性控制。混合流中的阻力强度似乎比两相流中的更为敏感，并且呈非线性。保留了两相质量流几个重要物理特性的新模型有望比两相流模型更快地模拟混合物的速度和压力，但在物理上比以前的简单混合物流模型更精确。可以通过速度和压力漂移重建两相动力学。广泛介绍和讨论了模型解决方案，包括扩展的惯性系数，阻力强度，质量通量增强，初始和沉积过程，混合物粘度以及扩散和反扩散过程。这显示了新扩展模型的实际应用潜力。

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