Simulating particle collision process based on Monte Carlo method

Abstract

Particle collision is non-trivial in many processes occurring in nuclear power system. A new particle collision algorithm has been carried out based on Monte Carlo approach under Lagrangian methodology. According to different collision kernel, the traveling time that a particle experiences between two neighborhood collision events is obtained in a more physical way than that in the current standard algorithm of O'Rourke. Besides, the outcomes of particle collision are acquired by proper collision models in choosing collision pairs, which are picked up by calculating the colliding times between two particles in each pair. To evaluate the performance of this new algorithm, first, a simulation for the total number changing with time of Brownian aerosols is compared with analytical solution. And the modeling result and the analytical formulation are in excellent agreement. Second, two mutual-impingement sprays are simulated by the new collision algorithm against that of O'Rourke. Then the modeling results are compared with experimental data, and it is found that the shapes of the mutual-impingement sprays obtained by the new algorithm are much better than that got by O'Rourke algorithm. Moreover, in order to investigate the working mechanism of the secondary moisture separator of AP1000, this new collision algorithm is applied to model the distribution of droplets moving in it. These modeling cases above show that the new collision algorithm is useful for numerical analysis, some kinds of particle-laden flows within particle collision process, such as sprays and droplet-steam flows, etc.

A new differentially weighted operator splitting Monte Carlo method for aerosol dynamics

“…Table 3 shows that the more complex case is, the more computational time is needed, and for the same case, the more simulation particles used, the more computational time is needed. It is because the computational time is approximately proportional to the number of simulation particles [16]. Generally speaking, the maximum relative error is within 1% for most of the cases, which proves very high accuracy of this new DWOSMC method.…”

Study on the Breakdown Mechanism of Water Film on Corrugated Plate Wall Under the Horizontal Shear of Airflow: A Short Communication

“…The corrugated plate dryer (CPD) is an important steam-water separation (SWS) equipment in the steam generator in the secondary loop of nuclear power plants (NPPs; Zhang et al, 2015;Huang et al, 2019;Wang and Tian, 2019a,b,c;Wang et al, 2019;Chen et al, 2020a,b;Fang et al, 2020a,b;Wang et al, 2020a,b,c). Therefore, it is very important to understand the process and mechanism of liquid film rupture (LFR) on the wall surface of the CPD.…”

“…The separation mechanism of the LFR is also closely related to the position of the LFR and the movement behavior after the rupture. Zhang et al (2015) studied the fluctuation of the LF on the wall surface of the CPD. Wang and Tian studied the rupture characteristics of the LF on the surface of the CPD (Wang et al, 2019;Wang and Tian, 2019a,b,c;Wang et al, 2020c).…”

Analysis of the Flow Characteristics of the Liquid Film on the Wall Surface of the Corrugated Plate Dryer Based on PSD Method: A Short Communication

“…In addition, the experimental study of the coronal spray produced when droplets hit the liquid film on the wall of the corrugated plate. Zhang et al (2015) studied the separation effect of the corrugated plate (Zhuang and Liu, 2020). The phenomenon of liquid film recirculation on the wall of the corrugated plate was observed when the flow velocity of the traverse air flow was large.…”