颗粒-槽道湍流两相流广泛存在于自然和工程应用中,研究其流动和传热特性至关重要.研究竖直槽道湍流中辐射加热颗粒的粒径分散性对颗粒分布形态的影响和对流动的调制作用.流体相采用直接数值模拟,颗粒相采用拉格朗日粒子追踪模型,考虑颗粒与流体之间的动量交换和热交换.研究结果表明,多尺度湍流结构对流场中不同粒径颗粒产生了不同的离心效果,使多粒径颗粒聚集在不同位置,导致多粒径颗粒相比单粒径颗粒在流场中的分布更均匀.另一方面,颗粒的空间位置分布影响相间能量交换,使得相比于单粒径热颗粒-湍流两相流,多粒径热颗粒能够促进相间的动能和热交换,提高流体的动能和温度,同时避免流场出现温度极值.
Particle-laden turbulent channel flow is prevalently manifested in natural and engineering applications, so the investigation of its flow and heat transfer characteristics holds significant importance. In this paper, the effect of the particle size dispersity of radiatively heated particles on particle distribution morphology and its modulation effect on the flow in vertical turbulent channel flow were investigated. Direct numerical simulation was used for fluid phase, and Lagrange-point tracking model was used for particle phase. The momentum and heat exchange between particles and fluid were considered. The research results reveal that the multi-scale turbulent structure exerts distinct centrifugal effects on particles with different particle sizes in the flow field, leading to the accumulation of polydisperse particles at disparate positions and resulting in a more homogeneous distribution of polydisperse particles in the flow field compared to that of monodisperse particles. Moreover, the spatial position distribution of the particles influences the interphase energy exchange, such that compared to the heated monodisperse particle-laden turbulent channel flow, the heated polydisperse particles accelerate the interphase momentum and heat exchange, enhance the momentum and temperature of the fluid, and concurrently avoid the temperature extremum in the flow field.
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