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- 저자 : Yuan Zhulin (검색결과 2 건)
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Numerical study on heterogeneous behavior of fine particle growth
FAN Fengxian,YANG Linjun,Yuan Zhulin,Yan Jinpei,Jo Young Min 한국입자에어로졸학회 2009 Particle and Aerosol Research Vol.5 No.4
PM2.5 is one of critical air pollutants due to its high absorbability of heavy metallic fumes, PAH and bacillary micro organisms. Such a fine particulate matter is often formed through various nucleation processes including condensation. This study attempts to find the nucleation behaviors of PM2.5 arisen from coal power stations using a classical heterogeneous Fletcher’s theory. The numerical simulation by C-language could approximate the nucleation process of PM2.5 from water vapor, of which approach revealed the required energy for embryo formation and embryo size and nucleation rate. As a result of the calculation, it was found that wetting agents could affect the particle nucleation in vapor condensation. In particular, critical contact angle relates closely with the vapor saturation. Particle condensation could be reduced by lowering the angles. The wetting agents aid to decrease the contact angle and surface tensions, thereby may contribute to save the formation energy. Key words : Particle nucleation, Fletcher’s theory, Particle wettability, Numerical simulation
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Modeling and simulation of drying characteristics on flexible filamentous particles in rotary dryers
Conghui Gu,Chao Zhang,Xin Zhang,Naihong Ding,Bin Li,Zhulin Yuan 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.1
Experiments were conducted to demonstrate the effects of the drum wall temperature on the heat and mass transfer in rotary dryers. The drying characteristics of flexible filamentous particles in rotary dryers were further explored. In addition, the inlet and outlet temperatures and moisture contents of granular particles were measured. As a result, the good agreement between the simulations and experiments verified the rationale and feasibility of the numerical method. Therefore, the approach was adopted to evaluate the temperature and moisture content of wet granular particles in a rotary dryer in different conditions, for instance, drum wall temperature and rotational speed. The results revealed that the higher drum wall temperature led to hotter particles with lower outlet moisture content. Conversely, the higher rotational speed resulted in cooler particles with higher outlet moisture content due to the decrease of residence time in the rotary dryer.
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