Experimental investigation of the microscale rotor–stator cavity flow with rotating superhydrophobic surface

Wang, Chunze; Tang, Fei; Li, Qi; Wang, Xiaohao

doi:10.1007/s00348-018-2499-y

Cited by 5 publications

(5 citation statements)

References 36 publications

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“…The vortex structure forms when the surface is facing the rotor. Wang et al [89] proposed to explore the shear stress of the rotor at high speed by using PDMS and silica nanoparticles to prepare superhydrophobic rotor. The air layer on the SHS has been proved to reduce the shear stress on the surface.…”

Section: Reynolds Numbermentioning

confidence: 99%

“…Reproduced with permission. [89] Copyright 2019, Springer. c) Experimental setup for the stereoscopic particle image velocimetry measurement of the flow generated by a rotor in water tank (drawn not to scale).…”

Section: Reynolds Numbermentioning

confidence: 99%

mentioning

confidence: 99%

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Recent Developments of Superhydrophobic Surfaces (SHS) for Underwater Drag Reduction Opportunities and Challenges

Feng

Sun

Tian

2021

Adv Materials Inter

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Superhydrophobic surfaces (SHS) for underwater drag reduction draw more and more attention owing to its promising and wide applications such as underwater vehicles, pipeline oil transportation, and aquaculture. However, the drag reduction properties are inextricably linked to the stability of air layer on SHS. This review highlights recent advances regarding SHS for underwater drag reduction in the past three years. First, the fundamental theories are briefly described. Next, the crucial influencing factors, which include dimension and arrangement of particles, layout, and shape of the microstructures, Reynolds number, and attack angle on underwater drag reducing performance of SHS are thoroughly listed. Furthermore, the superior or inferior of these manufacturing techniques is also individually illustrated. After that, the solutions of enhancing stability of the air layer are explicitly classified. Then, the practical applications and its potential value in ships and underwater vehicles, microchannels, as well as fabrics are briefly discussed. Finally, the remaining challenges and promising breakthroughs in the field of SHS for underwater drag reduction are clarified in depth.

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Section: Reynolds Numbermentioning

confidence: 99%

Section: Reynolds Numbermentioning

confidence: 99%

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Recent Developments of Superhydrophobic Surfaces (SHS) for Underwater Drag Reduction Opportunities and Challenges

Feng

Sun

Tian

2021

Adv Materials Inter

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“…(Gan and MacGregor 1995). The experimental research and numerical simulation analysis of the velocity field of rotating turbine blades were carried out (Lapworth and Chew 1992;Karabay et al 2001;Randriamampianina et al 2004;Zhao 2014;Wang et al 2018). A comparative study on the wind resistance estimation of centrifuge was carried out by Yin et al (2012), and velocity ratio of air to arm was mentioned.…”

Section: Introductionmentioning

confidence: 99%

An experimental study on aerodynamic characteristics of hypergravity centrifugal facility

Liu,

Zheng,

Xie

et al. 2024

Preprint

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Centrifugal modelling is widely recognized as a valuable approach in various fields, including slope and high dam engineering, geotechnical earthquake engineering, deep-sea engineering, and advanced material preparation research. Zhejiang University is building the Centrifugal Hypergravity Interdisciplinary Experiment Facility (CHIEF), poised to become the largest and fastest hypergravity centrifuge worldwide. A comprehensive analysis of the internal airflow characteristics is imperative for the effective design of the centrifuge, including velocity distribution and resultant aerodynamic forces induced by high-speed air rotation inside the centrifuge chamber. Such an analysis is pivotal to the design of critical aspects such as motor selection, vibration control, and chamber design. This work reveals the air velocity distribution and the velocity ratio between air and the centrifuge arm in a scaled-down hypergravity facility. Various working pressures (30–101 kPa) and arm velocity (200-1000g) are investigated. Air velocity is obtained, and the velocity ratio is 0.62–0.64. Moreover, the theoretical estimation of the wind resistance power is higher than the experimental results obtained. Additionally, the pressure difference between both sides of the heat exchanger and the top plate is analysed for safety consideration. The largest pressure difference is 5.83 kPa across the top plate, and in order to prevent resonance, the frequency doubling of the rotating arm should be paid attention in accordance to the spectrum analysis. This study serves as a valuable reference for investigating airflow characteristics in rotating machines and the designing large hypergravity facilities.

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“…Wang et al [7] performed particle image velocimetry measurements in a water-filled microscale rotor-stator cavity made of glass with smooth compared to hydrophobic discs at low Reynolds numbers. They found a reduction of torque of more than 50 % when using hydrophobic rotors, which was attributed to a thin air layer between disc and liquid in the case of hydrophobic rotor surfaces and to a reduction of turbulence intensity.…”

Section: Introductionmentioning

confidence: 99%

Impact of Leakage Inlet Swirl Angle in a Rotor–Stator Cavity on Flow Pattern, Radial Pressure Distribution and Frictional Torque in a Wide Circumferential Reynolds Number Range

Schröder

Dohmen

Brillert

et al. 2020

IJTPP

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In the side-chambers of radial turbomachinery, which are rotor–stator cavities, complex flow patterns develop that contribute substantially to axial thrust on the shaft and frictional torque on the rotor. Moreover, leakage flow through the side-chambers may occur in both centripetal and centrifugal directions which significantly influences rotor–stator cavity flow and has to be carefully taken into account in the design process: precise correlations quantifying the effects of rotor–stator cavity flow are needed to design reliable, highly efficient turbomachines. This paper presents an experimental investigation of centripetal leakage flow with and without pre-swirl in rotor–stator cavities through combining the experimental results of two test rigs: a hydraulic test rig covering the Reynolds number range of 4 × 10 5 ≤ R e ≤ 3 × 10 6 and a test rig for gaseous rotor–stator cavity flow operating at 2 × 10 7 ≤ R e ≤ 2 × 10 8 . This covers the operating ranges of hydraulic and thermal turbomachinery. In rotor–stator cavities, the Reynolds number R e is defined as R e = Ω b 2 ν with angular rotor velocity Ω , rotor outer radius b and kinematic viscosity ν . The influence of circumferential Reynolds number, axial gap width and centripetal through-flow on the radial pressure distribution, axial thrust and frictional torque is presented, with the through-flow being characterised by its mass flow rate and swirl angle at the inlet. The results present a comprehensive insight into the flow in rotor–stator cavities with superposed centripetal through-flow and provide an extended database to aid the turbomachinery design process.

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Experimental investigation of the microscale rotor–stator cavity flow with rotating superhydrophobic surface

Cited by 5 publications

References 36 publications

Recent Developments of Superhydrophobic Surfaces (SHS) for Underwater Drag Reduction Opportunities and Challenges

Recent Developments of Superhydrophobic Surfaces (SHS) for Underwater Drag Reduction Opportunities and Challenges

An experimental study on aerodynamic characteristics of hypergravity centrifugal facility

Impact of Leakage Inlet Swirl Angle in a Rotor–Stator Cavity on Flow Pattern, Radial Pressure Distribution and Frictional Torque in a Wide Circumferential Reynolds Number Range

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