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首页> 外文期刊>International Journal of Heat and Mass Transfer >Energy conservative dissipative particle dynamics simulation of mixed convection in eccentric annulus
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Energy conservative dissipative particle dynamics simulation of mixed convection in eccentric annulus

机译：偏心环形混合对流的能量保守耗散粒子动力学模拟。

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摘要

Dissipative particle dynamics with energy conservation (eDPD) is a potentially effective mesoscopic approach in simulating complex convection heat transfer phenomena. The eDPD is applied to model mixed convection heat transfer in eccentric annulus. We propose a numerical strategy for dealing with irregular geometries in DPD system and by which the application of DPD (or any other particle simulation method) can be extended to mimic hydrodynamics in arbitrarily complex geometries like ones with moving surface or free surface which cannot be defined by mathematical functions. The eDPD results for con-vective heat transfer are compared to the finite volume solutions and the experimental data, and a good agreement is achieved. The results by eDPD are also compared well with those by lattice Boltzmann method (LBM). From the comparisons we find that the forced, natural and mixed convection flow and heat transfer in complex geometries are correctly predicted using eDPD model. Finally, the effect of eccentricity on heat transfer at various locations is examined at Ra=2 ×10~4 and Re = 200, and the streamlines and temperature distributions as well as Nusselt number are obtained. The results show that the average Nusselt number increases when the inner cylinder moves downward regardless of the radial position.
机译：具有能量守恒的耗散粒子动力学（eDPD）是模拟复杂对流传热现象的潜在有效介观方法。 eDPD用于模拟偏心环空中的混合对流传热。我们提出了一种用于处理DPD系统中不规则几何形状的数值策略，通过该策略可以扩展DPD（或任何其他粒子模拟方法）的应用，以模拟任意复杂几何形状（如具有无法定义的运动表面或自由表面的几何形状）中的流体动力学。通过数学函数。将对流传热的eDPD结果与有限体积解和实验数据进行了比较，并取得了良好的一致性。 eDPD的结果也与格子Boltzmann方法（LBM）的结果进行了很好的比较。通过比较，我们发现使用eDPD模型可以正确预测复杂几何形状中的强迫，自然和混合对流以及传热。最后，在Ra = 2×10〜4和Re = 200的情况下，研究了偏心率对各个位置传热的影响，并获得了流线，温度分布以及Nusselt数。结果表明，无论径向位置如何，当内筒向下移动时，平均努塞尔数都会增加。

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  • 作者

    Zhi-Hong Cao; Kang Luo; Hong-Liang Yi; He-Ping Tan;

  • 作者单位

    School of Energy Science and Engineering, Harbin Institute of Technology, 92 West Dazhi Street, Harbin 150001, PR China;

    School of Energy Science and Engineering, Harbin Institute of Technology, 92 West Dazhi Street, Harbin 150001, PR China;

    School of Energy Science and Engineering, Harbin Institute of Technology, 92 West Dazhi Street, Harbin 150001, PR China;

    School of Energy Science and Engineering, Harbin Institute of Technology, 92 West Dazhi Street, Harbin 150001, PR China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Mixed convection; Complex geometry; Dissipative particle dynamics; Eccentric annulus;

    机译：混合对流;复杂的几何;耗散粒子动力学;偏心环;

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