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- 저자 : Yanfang Yu (검색결과 6 건)
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Numerical analysis of thermal dynamics and mixing performance in the blade-type static mixers
Yanfang Yu,Yaxin Chen,Huibo Meng,Yunjuan Yao,Dongzhou Liu,Jianhua Wu 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.7
The turbulent thermal dynamics and mixing performance of kenics static mixer (KSM), lightnin static mixer (LSM) and Q-type static mixer (QSM) were numerically simulated with uniform heat flux within the range of Reynolds numbers (Re) between 6000 and 30000. The numerical predictions of Nusselt number (Nu) and friction coefficient (f) in KSM were well consistent with the experimental data. The dean vortices, thermal resistance, entropy generation and field synergy were fully analyzed to obtain the enhancement mechanism of heat transfer performance. The synergy performance between temperature gradient and flow field firstly decreased and then increased and are superior to that of KSM with increasing Re. With the same Re, the entropy generation rates of LSM are 0.93-0.94 times that of QSM. LSM is a better alternative consideration for convection mixing and heat transfer enhancement. Two new relationships between Nu and f under different dimensionless uniform heat flux are obtained.
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Key Technologies of Supercapacitor Energy Storage System of IP Transmitter
Zhihui Zeng,Xiaowei Wang,Yanfang Wei,Zhiguo Hu,Yangxiao Yu,Zhigang Zhang 전력전자학회 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.1
A practical application of a supercapacitor energy storage system in a polarization instrument is proposed on the basis of theenergy storage requirements of an induced polarization (IP) transmitter for geophysical exploration. We focused on the energystorage system of a supercapacitor, the topology of the power converter, and the system control strategy as key technologies, andwe performed theoretical research and experimental tests on the system and developed an experimental platform. Theexperiments validated the theoretical research on the key technologies of the supercapacitor energy storage system anddemonstrated the effectiveness of the innovation. Results showed that the storage system is efficient and satisfies the energystorage needs of the IP transmitter.
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Huibo Meng,Xiuhui Jiang,Yanfang Yu,Zongyong Wang,Jianhua Wu 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.5
The laminar flow and chaotic mixing characteristics of a high-viscosity fluid in static mixers with staggered perforated helical segments were numerically investigated in the range of Re=0.1-150. The numerical results of pressure drop of Kenics static mixer have a good agreement with the reported data from the literature. The effects of aspect ratio Ar and Reynolds number on the mixing performance of Modified Kenics Static Mixers (MKSM) were evaluated by Darcy friction coefficient, shear rate, stretching rate, and Lyapunov exponent, respectively. The product of f×Re for MKSM linearly increased with the increase of Re, but it was constant under Re<10. The values of shear rate in the first perforated hole of mixing elements gradually became much larger by 1.10%-11.78% than those in the second perforated hole with the increasing Re. With the increase of dimensionless axial mixing length, the stretching rate increased linearly and the sensitivity for initial condition gradually weakened. A larger Ar is beneficial for micro-mixing in creeping flow. The average Lyapunov exponent linearly increases with the increase of Re. The profiles of Lyapunov exponent at different dimensionless perforated diameter (d/W) and perforated spacing (s/W) indicate that the chaotic mixing in MKSM is much more sensitive to d/W than s/W. A dimensionless parameter η taking into account the mixing degree and pressure drop was employed to evaluate the mixing efficiency. The optimization of perforated helical segments with the highest mixing efficiency at Re=100 was d/W=0.55 and s/W=1.2.
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Huibo Meng,Yuning Hao,Yanfang Yu,Zhonggen Li,Shuning Song,Jianhua Wu 한국화학공학회 2020 Korean Journal of Chemical Engineering Vol.37 No.11
Under the conditions of liquid phase inlet Re ranging from 9,836 to 56,206 and gas fraction α from 4.76% to 66.67%, gas-liquid two-phase bubbly flow was investigated in a static mixer with three twisted leaves (TKSM) with a diameter of 100mm and an aspect ratio of 1.5. A high-speed camera Revealer-2F04M with a resolution of 1,920×1,080 pixels was used to capture the evolution of bubble groups at the different axial windows of mixer elements. The results show that the flow pattern in the TKSM is still in bubbly flow at the flow rate of continuous phase QL no more than 1.0 m3/h and gas fraction α higher up to 54.55%-66.67%. The Sauter mean diameter d32 of bubble groups gradually decreased with the increase of the mixing elements number. With the given liquid flow rate QL1.0m3/h, the Sauter mean diameter d32 firstly decreased and then increased with the increase of gas flow rate. The local minimum of d32 was obtained at QG=0.72m3/h and 84.5% of the dB/D0 is in the range of 0.02-0.05. The relationship among Sauter mean diameter, the inner diameter and the non-dimensional residence time satisfies the correlation We0.35·d32/D0=0.026 0.17.
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Huibo Meng,Yunjuan Yao,Yanfang Yu,Bowen Shi,Pengcheng Ding 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.1
Supercritical CO2 has excellent flow and heat transfer characteristics, but studies are lacking on the heat transfer characteristics of static mixers using it as a working medium. To obtain the heat transfer enhancement mechanism of supercritical CO2 within static mixers with three helical blades (TKSM), the flow and heat transfer characteristics of supercritical CO2 in horizontal and vertically upward of TKSM were determined by three-dimensional steady-state numerical simulation at Re=7,900−22,385, respectively. With other parameters fixed, lower heat flux, inlet temperature, operating pressure, or higher mass flow corresponds to higher heat transfer coefficients (h). The orthogonal test revealed that mass flow has the greatest effect on heat transfer. Besides, the results showed that the comprehensive performance evaluation criteria (PEC) of TKSM were 1.18–1.64 times and 1.25–1.47 times of Kenics static mixer (KSM) in two different states. Considering the local deterioration of the horizontal flow, the vertically upward flow was recommended with uniform temperature distributions. Compared with the horizontal flow, the heat transfer capacity of TKSM in the upward flow increases by 92.64%–119.63%, whereas the buoyancy effect decreases by 99.83%–99.97%.
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Key Technologies of Supercapacitor Energy Storage System of IP Transmitter
Zeng, Zhihui,Wang, Xiaowei,Wei, Yanfang,Hu, Zhiguo,Yu, Yangxiao,Zhang, Zhigang The Korean Institute of Power Electronics 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.1
A practical application of a supercapacitor energy storage system in a polarization instrument is proposed on the basis of the energy storage requirements of an induced polarization (IP) transmitter for geophysical exploration. We focused on the energy storage system of a supercapacitor, the topology of the power converter, and the system control strategy as key technologies, and we performed theoretical research and experimental tests on the system and developed an experimental platform. The experiments validated the theoretical research on the key technologies of the supercapacitor energy storage system and demonstrated the effectiveness of the innovation. Results showed that the storage system is efficient and satisfies the energy storage needs of the IP transmitter.
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