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Laminar-to-Turbulence Transition Revealed Through a Reynolds Number Equivalence Article

Xiao Dong Chen

Engineering 2019, Volume 5, Issue 3, Pages 576-579 doi: 10.1016/j.eng.2018.09.013

Abstract:

Flow transition from laminar to turbulent mode (and vice versa)—that is, the initiation of turbulenceEven for pipe flow, predicting the onset of turbulence requires sophisticated instrumentation and/ordirect numerical simulation, based on observing the instantaneous flow structure formation and evolutionlayer thickness (y⁺ = 1, where y⁺ is the dimensionless distance from and velocity (nonlinearity) can qualify the source of turbulence (i.e., generate turbulent

Keywords： Local Reynolds number equivalence Flow transition from laminar to turbulent mode Universal law of thewall Pipe flow Plate flow Modeling

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Experimental study of humid air reverse diffusion combustion in a turbulent flow field

GE Bing, ZANG Shusheng, GU Xin

Frontiers in Energy 2007, Volume 1, Issue 4, Pages 428-434 doi: 10.1007/s11708-007-0062-6

Abstract: Experiments were performed to investigate the differences between the propane/air turbulent diffusionreactive flows past bluff-body and the propane/humid air turbulent diffusion reactive flows in the same

Keywords： propane/humid propane/air turbulent bluff-body turbulent diffusion

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URANS simulation of the turbulent flow in tight lattice bundle

Yiqi YU, Yanhua YANG

Frontiers in Energy 2011, Volume 5, Issue 4, Pages 404-411 doi: 10.1007/s11708-011-0165-7

Abstract: The flow structure in tight lattice is still of great interest to nuclear industry.An accurate prediction of flow parameter in subchannels of tight lattice is likable.In this paper, the turbulent flow with different Reynolds number (5000–215000) and different pitch-to-diameterThe effects of the Reynolds number and the bundle geometry ( / ) on wall shear stress, turbulent kineticenergy, turbulent mixing and large scale coherent structure in tight lattice are analyzed in details

Keywords： tight rod bundle flow structure unsteady Reynolds averaged Navier Stokes (URANS)

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Large eddy simulation of turbulent buffet forces in flow induced vibration

XI Zhide, CHENG Bingde, LI Pengzhou

Frontiers in Energy 2008, Volume 2, Issue 4, Pages 524-527 doi: 10.1007/s11708-008-0099-x

Abstract: The results show that the Power Spectrum Density (PSD) of LES from the calculation and the test are in

Keywords： Spectrum Density Smagorinsky sub-grid vibration calculation Qinshan Nuclear

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Numerical simulation of three-dimensional turbulent flow in multistage axial compressor blade row

JIANG Jian, LIU Bo, WANG Yangang, NAN Xiangyi

Frontiers in Energy 2008, Volume 2, Issue 3, Pages 320-325 doi: 10.1007/s11708-008-0041-2

Abstract: Numerical simulation of three-dimensional turbulent flow in a multistage axial compressor blade row isA high resolution, third-order ENN scheme is adopted to catch the shockwave and simulate the turbulentflow correctly,

Keywords： simulation compressor multistage third-order three-dimensional turbulent

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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

Frontiers in Energy 2010, Volume 4, Issue 4, Pages 496-506 doi: 10.1007/s11708-010-0020-2

Abstract: of the energy conservation equation in terms of heat flux to explain the thermal boundary effects on laminarFor a laminar convection through a square duct, it explains that on the wall surface, the velocity iscontribute to convection; for UWHF, the largest term of the gradient of velocity components (the main flowThe thermal boundary effects on the laminar convection inside the flow are also detailed.

Keywords： convective transport heat transfer mass transfer laminar flow thermal boundary effects

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A New Explicit Equation for Calculating the Friction Factor for the Turbulent Flow in Pipes

Wang Yong,Yuan Qi

Strategic Study of CAE 2006, Volume 8, Issue 6, Pages 83-88

Abstract:

The friction factor for the turbulent flow in pipes is the binary nonlinear function of Reynolds numberequation with the above method, a new explicit equation for calculating the friction factor for the turbulentflow in pipes was obtained.

Keywords： turbulent flow friction factor implicit Colebrook equation genetic algorithms intelligent fitting method

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Martin Blunt：Flow in Porous Media in the Energy Transition（2022-10-12）

18 Oct 2022

Keywords：碳中和

Experimental study for the stratified to slug flow regime transition mechanism of gas-oil two-phase flow

LIU Yiping, YANG Weilin, WANG Jing

Frontiers in Energy 2008, Volume 2, Issue 2, Pages 152-157 doi: 10.1007/s11708-008-0012-7

Abstract: Theoretical relations that predict the transition from a stratified pattern to a slug pattern, includingcontains less empiricism than the commonly used Taitel-Dukler model, and the ideal model for stratified flowfor the gas-liquid flow in horizontal pipes are presented.regime transition.The effect of pipe diameter on the transition was also studied.

Keywords： two-phase Superficial reasonable prediction one-dimensional gas-liquid

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Analysis of flow over backward facing step with transition

Dwarikanath RATHA,Arindam SARKAR

Frontiers of Structural and Civil Engineering 2015, Volume 9, Issue 1, Pages 71-81 doi: 10.1007/s11709-014-0270-x

Abstract: The flow of air over a backward facing step has been investigated numerically using FLUENT.reattachment length for all the three cases are analyzed for wide range of Reynolds number ranging from100 to 7000 which covers the laminar, transition and turbulent flow of air.reattachment length at the bottom wall downstream of the step is minimum for the step with round edged transitionand maximum for the step with a vertical drop transition.

Keywords： Reattachment length backward facing step transition flow separation k-? model

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Burnett simulations of gas flow and heat transfer in microchannels

Fubing BAO, Jianzhong LIN

Frontiers of Mechanical Engineering 2009, Volume 4, Issue 3, Pages 252-263 doi: 10.1007/s11465-009-0037-6

Abstract: In micro- and nanoscale gas flows, the flow falls into the transition flow regime.There are not enough molecule collisions and the gas deviates from the equilibrium.The Navier-Stokes equations fail to describe the gas flow in this regime.augmented Burnett equations with high-order slip boundary conditions are then used to model the gas flowand heat transfer in Couette and Poiseuille flows in the transition regime.

Keywords： micro- and nanoscale gas flow slip-transition flow regime Burnett equations numerical simulation

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A review on ductile mode cutting of brittle materials

Elijah Kwabena ANTWI, Kui LIU, Hao WANG

Frontiers of Mechanical Engineering 2018, Volume 13, Issue 2, Pages 251-263 doi: 10.1007/s11465-018-0504-z

Abstract: Ductile mode cutting is a very promising way to achieve high quality and crack-free surfaces of brittleThus the study of ductile mode cutting of brittle materials has been attracting more and more effortsThis paper provides an overview of ductile mode cutting of brittle materials including ductile naturecharacteristics, molecular dynamic simulation, critical undeformed chip thickness, brittle-ductile transition, subsurface damage, as well as a detailed discussion of ductile mode cutting enhancement.

Keywords： ductile mode cutting brittle materials critical undeformed chip thickness brittle-ductile transition

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Aerobic granular sludge formation based on substrate availability: Effects of flow pattern and fermentation

Quan Yuan, Hui Gong, Hao Xi, Kaijun Wang

Frontiers of Environmental Science & Engineering 2020, Volume 14, Issue 3, doi: 10.1007/s11783-020-1226-0

Abstract: The influences of flow patterns (mixed-flow and plug-flow) and fermentation pretreatment on aerobic granularR1 achieved faster granulation with a fast influent fill step followed by a modified anaerobic mixed-flowThe anaerobic plug-flow feeding mode (with influent fed slowly from the bottom) in R2 provided deeperAn acidogenic up-flow sludge bed reactor was introduced as a pretreatment to improve the AGS performance

Keywords： Anaerobic plug-flow feeding mode Anaerobic mixed-flow mode Fermentation pretreatment Substrate gradient

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Factors affecting photocatalytic performance through the evolution of the properties due to the phase transitionfrom NaBiO·2HO to BiO

Frontiers in Energy 2022, Volume 16, Issue 3, Pages 471-482 doi: 10.1007/s11708-021-0778-4

Abstract: The phase transition process of a photocatalytic system from NaBiO₃·2H₂O to BiOThe investigation of the gradient phase transition process presents a clear guidance to construct a desired

Keywords： composite construction distribution BiO_2–_x evolution of defects

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Experimental and kinetic study on laminar flame speeds of ammonia/syngas/air at a high temperature and

Frontiers in Energy 2022, Volume 16, Issue 2, Pages 263-276 doi: 10.1007/s11708-021-0791-7

Abstract: The laminar flame speeds of ammonia mixed with syngas at a high pressure, temperature, and differentNO is mainly formed from reaction, HNO+ H= NO+ H₂.

Keywords： ammonia mixed with syngas laminar flame speed kinetic model sensitivity analysis pathway analysis