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Lei Sun, Xihuan Sun, Yongye Li and Cheng Wang
The boundary layer is the main source of frictional resistance in gap flow, and the study of the flow structure characteristics of the gap flow boundary layer is of great significance for the study of gap flow theory. In this study, the PIV technique was...
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Charles R. Ortloff
High-speed fluid flows over roughened surfaces occur in many engineering applications; one important application involves high velocity water flows in pipelines with roughened interior walls where the wall roughness affects head loss estimates necessary ...
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Martin Gehrke and Thomas Rung
This technical paper outlines the predictive performance of a recently published dynamic cumulant lattice Boltzmann method (C-LBM) to model turbulent shear flows at all resolutions. Emphasis is given to a simple strategy that avoids a frequently observed...
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Dapeng Xiong, Yinxin Yang and Yanan Wang
An improved synthetic eddy method (SEM) is proposed in this paper for generating the boundary layer at the inlet of a computational domain via direct numerical simulation. The improved SEM modified the definition of the radius and the velocities of the e...
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Weiqi Tang, Qiu Wang, Bingchen Wei, Jiwei Li, Jinping Li, Jiahao Shang, Kun Zhang and Wei Zhao
A two-stage light gas gun driven by gaseous detonation was newly constructed, which can make up for the disadvantages of the insufficient driving capability of high-pressure gas and the constraints of gunpowder. The performance of the gas gun was investi...
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Tongsheng Wang, Tiezhi Sun, Cong Wang, Chang Xu and Yingjie Wei
Microbubble drag reduction has good application prospects. It operates by injecting a large number of bubbles with tiny diameters into a turbulent boundary layer. However, its mechanism is not yet fully understood. In this paper, the mechanisms of microb...
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Najiyah Safwa Khashi?ie, Norihan Md Arifin, Ezad Hafidz Hafidzuddin and Nadihah Wahi
The present study emphasizes the combined effects of double stratification and buoyancy forces on nanofluid flow past a shrinking/stretching surface. A permeable sheet is used to give way for possible wall fluid suction while the magnetic field is impose...
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Alireza Khalili Asboei, Yousef Vazifeshenas, Mazaher Rahimi-Esbo, Reza Mohammadyari, Vandana .
Pág. e37348
A comparative investigation of enhanced heat transfer and friction factor by insertion of twisted tapes consisting of alternate axes and regularly spaced tapes in a round tube under wall heat flux condition is presented in this paper. This effort e...
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Yat-Kiu Ho and Chun-Ho Liu
Street-level ventilation is often weakened by the surrounding high-rise buildings. A thorough understanding of the flows and turbulence over urban areas assists in improving urban air quality as well as effectuating environmental management. In this pape...
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Setyo Nugroho, Achmad Arifudin Hidayatulloh
Pág. 358 - 370
The use of elbow or curved pipe in the installation of piping has a loss of pressure (pressure drop) which could lead the power of pump that drive the fluid and decrease the energy efficiency of the system. The pressure drop is caused by the curved shape...
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