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通过一个等价雷诺数揭示层流到湍流的转捩区域 Article
陈晓东
《工程(英文)》 2019年 第5卷 第3期 页码 576-579 doi: 10.1016/j.eng.2018.09.013
Flow transition from laminar to turbulent mode (and vice versa)—that is, the initiation of turbulence—is one of the most important research subjects in the history of engineering. Even for pipe flow, predicting the onset of turbulence requires sophisticated instrumentation and/or direct numerical simulation, based on observing the instantaneous flow structure formation and evolution. In this work, a local Reynolds number equivalence γ (ratio of local inertia effect to viscous effect) is seen to conform to the Universal Law of the Wall, where γ = 1 represents a quantitative balance between the abovementioned two effects. This coincides with the wall layer thickness (y+ = 1, where y+ is the dimensionless distance from the wall surface defined in the Universal Law of the Wall). It is found that the characteristic of how the local derivative of γ against the local velocity changes with increasing velocity determines the onset of turbulence. For pipe flow, γ ≈ 25, and for plate flow, γ ≈ 151.5. These findings suggest that a certain combination of γ and velocity (nonlinearity) can qualify the source of turbulence (i.e., generate turbulent energy). Similarly, a re-evaluation of the previous findings reveals that only the geometrically narrow domain can act locally as the source of turbulence, with the rest of the flow field largely being left for transporting and dissipating. This understanding will have an impact on the future large-scale modeling of turbulence.
A way to explain the thermal boundary effects on laminar convection through a square duct
Liangbi WANG, Xiaoping GAI, Kun HUANG, Yongheng ZHANG, Xiang YANG, Xiang WU
《能源前沿(英文)》 2010年 第4卷 第4期 页码 496-506 doi: 10.1007/s11708-010-0020-2
关键词: convective transport heat transfer mass transfer laminar flow thermal boundary effects
《能源前沿(英文)》 2022年 第16卷 第2期 页码 263-276 doi: 10.1007/s11708-021-0791-7
关键词: ammonia mixed with syngas laminar flame speed kinetic model sensitivity analysis pathway analysis
Wenchi GONG, Jun SHEN, Wei DAI, Zeng DENG, Xueqiang DONG, Maoqiong GONG
《能源前沿(英文)》 2020年 第14卷 第1期 页码 127-138 doi: 10.1007/s11708-020-0661-8
关键词: laminar flow hydraulic entrance length super hydrophobic surface slip length hydraulic diameter
Theoretical study of vibrating effect on heat transfer in laminar flow
Baoxing LI, Maocheng TIAN, Xueli LENG, Zheng ZHANG, Bo JIANG
《能源前沿(英文)》 2010年 第4卷 第4期 页码 542-545 doi: 10.1007/s11708-010-0026-9
Numerical study on laminar flame speed of natural gas-carbon monoxide-air mixtures
Chen DONG, Qulan ZHOU, Qinxin ZHAO, Tongmo XU, Shi’en HUI
《化学科学与工程前沿(英文)》 2010年 第4卷 第4期 页码 411-416 doi: 10.1007/s11705-010-0514-9
关键词: laminar flame speed numerical study nonmonotonic increasing trend
Experimental study on the laminar flame speed of hydrogen/natural gas/air mixtures
Chen DONG, Qulan ZHOU, Xiaoguang ZHANG, Qinxin ZHAO, Tongmo XU, Shi’en HUI
《化学科学与工程前沿(英文)》 2010年 第4卷 第4期 页码 417-422 doi: 10.1007/s11705-010-0515-8
Numerical simulation of laminar premixed combustion in a porous burner
ZHAO Pinghui, CHEN Yiliang, LIU Minghou, DING Min, ZHANG Genxuan
《能源前沿(英文)》 2007年 第1卷 第2期 页码 233-238 doi: 10.1007/s11708-007-0032-8
关键词: interphase mixture dominant Premixed combustion premixed combustion
M. ARULPRAKASAJOTHI,K. ELANGOVAN,K. HEMA CHANDRA REDDY,S. SURESH
《能源前沿(英文)》 2016年 第10卷 第2期 页码 136-142 doi: 10.1007/s11708-015-0389-z
Numerical study of internal flow field and flow passage improvement of an inlet particle separator
Florian PAOLI, Tong WANG
《能源前沿(英文)》 2011年 第5卷 第4期 页码 386-397 doi: 10.1007/s11708-011-0156-8
关键词: streamlines pressure losses flow passage improvement inlet particle separator (IPS)
陆钟武
《中国工程科学》 2006年 第8卷 第1期 页码 18-25
流动,是物质(如铜、铝等)流动和流体流动二者所具有的基本特征,基于这个论点,简要地回顾了流体力学中研究流体流动的两种方法,即拉格朗日法和欧拉法;相应地提出了物质流分析的两种方法,即跟踪观察法和定点观察法。由于前者在文献中未见报道,因此对它进行了重点说明。强调了物质流的跟踪观察法既适用于稳态物质流(产品产量不变),也适用于非稳态物质流(产品产量增长或下降)。以钢铁产品生命周期的铁流图为例,说明了物质流的跟踪模型。在引入了物质流的非稳度后,提出了物质流各项指标的计算式,以及它们之间的相互关系。以瑞典铅酸电池系统为对象,计算了其中铅流的各项指标,并进行了必要的分析。
UPFC setting to avoid active power flow loop considering wind power uncertainty
Shenghu LI, Ting WANG
《能源前沿(英文)》 2023年 第17卷 第1期 页码 165-175 doi: 10.1007/s11708-020-0686-z
关键词: active power loop flow (APLF) unified power flow controller (UPFC) wind power uncertainty interval power flow (IPF)
A novel flow electrode capacitive deionization device with spindle-shaped desalting chamber
《环境科学与工程前沿(英文)》 2023年 第18卷 第4期 doi: 10.1007/s11783-024-1800-y
● A spindle-shaped influent chamber was designed and equipped in FCDI system.
关键词: Spindle-shaped chamber Desalination performance Flow electrode capacitive deionization
Simulation of horizontal slug-flow pneumatic conveying with kinetic theory
GU Zhengmeng, GUO Liejin
《能源前沿(英文)》 2007年 第1卷 第3期 页码 336-340 doi: 10.1007/s11708-007-0050-6
关键词: velocity distribution detailed slug-flow gas-solid theory
标题 作者 时间 类型 操作
A way to explain the thermal boundary effects on laminar convection through a square duct
Liangbi WANG, Xiaoping GAI, Kun HUANG, Yongheng ZHANG, Xiang YANG, Xiang WU
期刊论文
Experimental and kinetic study on laminar flame speeds of ammonia/syngas/air at a high temperature and
期刊论文
Effects of slip length and hydraulic diameter on hydraulic entrance length of microchannels with superhydrophobic surfaces
Wenchi GONG, Jun SHEN, Wei DAI, Zeng DENG, Xueqiang DONG, Maoqiong GONG
期刊论文
Theoretical study of vibrating effect on heat transfer in laminar flow
Baoxing LI, Maocheng TIAN, Xueli LENG, Zheng ZHANG, Bo JIANG
期刊论文
Numerical study on laminar flame speed of natural gas-carbon monoxide-air mixtures
Chen DONG, Qulan ZHOU, Qinxin ZHAO, Tongmo XU, Shi’en HUI
期刊论文
Experimental study on the laminar flame speed of hydrogen/natural gas/air mixtures
Chen DONG, Qulan ZHOU, Xiaoguang ZHANG, Qinxin ZHAO, Tongmo XU, Shi’en HUI
期刊论文
Numerical simulation of laminar premixed combustion in a porous burner
ZHAO Pinghui, CHEN Yiliang, LIU Minghou, DING Min, ZHANG Genxuan
期刊论文
Experimental investigation on heat transfer effect of conical strip inserts in a circular tube under laminarflow
M. ARULPRAKASAJOTHI,K. ELANGOVAN,K. HEMA CHANDRA REDDY,S. SURESH
期刊论文
Numerical study of internal flow field and flow passage improvement of an inlet particle separator
Florian PAOLI, Tong WANG
期刊论文
UPFC setting to avoid active power flow loop considering wind power uncertainty
Shenghu LI, Ting WANG
期刊论文