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Keywords: drag reduction
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Proceedings Papers

Proc. ASME. FEDSM2022, Volume 1: Fluid Applications and Systems (FASTC); Fluid Measurement and Instrumentation (FMITC); Fluid Mechanics (FMTC), V001T03A015, August 3–5, 2022
Publisher: American Society of Mechanical Engineers
Paper No: FEDSM2022-87396
... Abstract There is a need for fuel-efficient vehicles to reduce greenhouse emission and minimize the range problem of electric vehicles. Aerodynamic drag reduction provides one of the cheapest but effective alternatives. Therefore, the development and analysis of new passive strategies that can...
Proceedings Papers

Proc. ASME. FEDSM2021, Volume 3: Fluid Mechanics; Micro and Nano Fluid Dynamics; Multiphase Flow, V003T05A009, August 10–12, 2021
Publisher: American Society of Mechanical Engineers
Paper No: FEDSM2021-61461
... as a passive drag reduction method for flow over a cylinder that features both attached and separated flow. The impact of the microfiber coating on drag is experimentally investigated at a Reynolds number of 6.1 × 10 4 based on the cylinder diameter. Microfiber coatings of various lengths between 1.1% and 8.0...
Proceedings Papers

Proc. ASME. FEDSM2021, Volume 3: Fluid Mechanics; Micro and Nano Fluid Dynamics; Multiphase Flow, V003T07A010, August 10–12, 2021
Publisher: American Society of Mechanical Engineers
Paper No: FEDSM2021-65760
... is addressed in this research. Furthermore, the textures disrupt the thermal boundary layer, which can boost thermal transport through recirculation mixing. However, the stagnant fluid trapped within the grooves has weak convective heat transfer. So far, the results have been promising and a drag reduction...
Proceedings Papers

Proc. ASME. AJKFluids2019, Volume 5: Multiphase Flow, V005T05A001, July 28–August 1, 2019
Publisher: American Society of Mechanical Engineers
Paper No: AJKFluids2019-4647
... shown formation of microbubble clusters intermittently, which has Coulomb potential due to negative electric charge on bubble interfaces. microbubble turbulent boundary layer drag reduction multiphase flow flow visualization VISUALIZATION OF MICROBUBBLE DISTRIBUTION INSIDE TURBULENT...
Proceedings Papers

Proc. ASME. AJKFluids2019, Volume 2: Computational Fluid Dynamics, V002T02A036, July 28–August 1, 2019
Publisher: American Society of Mechanical Engineers
Paper No: AJKFluids2019-4619
... drag reduction air cavity system numerical modeling Abstract Practical implementation of ship drag reduction techniques can lead to substantial fuel savings and lessening environmental impacts of maritime transportation. One of such technologies is based on injecting air underneath ship...
Proceedings Papers

Proc. ASME. AJKFluids2019, Volume 1: Fluid Mechanics, V001T01A011, July 28–August 1, 2019
Publisher: American Society of Mechanical Engineers
Paper No: AJKFluids2019-5681
...PREDICTION OF DRAG REDUCTION EFFECT OF PULSATING CONTROL IN TURBULENT PIPE FLOW BY MACHINE LEARNING Wataru Kobayashi*, Takaaki Shimura, Akihiko Mitsuishi, Kaoru Iwamoto and Akira Murata Department of Mechanical Systems Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho...
Proceedings Papers

Proc. ASME. AJKFluids2019, Volume 1: Fluid Mechanics, V001T01A012, July 28–August 1, 2019
Publisher: American Society of Mechanical Engineers
Paper No: AJKFluids2019-5691
...LDV MEASUREMENT OF TURBULENT PIPE FLOW WITH TRAVELING WAVY ELASTIC WALL FOR DRAG REDUCTION Seiya Nakazawa1, Takaaki Shimura, Akihiko Mitsuishi, Kaoru Iwamoto, Akira Murata Department of Mechanical Systems Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo...
Proceedings Papers

Proc. ASME. AJKFluids2019, Volume 1: Fluid Mechanics, V001T01A005, July 28–August 1, 2019
Publisher: American Society of Mechanical Engineers
Paper No: AJKFluids2019-5121
... the rear end for drag reduction. Experiments are conducted with the model (L840mm × H300mm × W300mm) in a Gottingen type wind tunnel with a ground plate. Reynolds number is fixed at 1,200,000, corresponding to a freestream velocity of approxi- mately 20 m/s. Aerodynamic force, surface pressure near...
Proceedings Papers

Proc. ASME. FEDSM2012, Volume 1: Symposia, Parts A and B, 945-950, July 8–12, 2012
Publisher: American Society of Mechanical Engineers
Paper No: FEDSM2012-72437
... An experimental study of a new three-dimensional (3-D) riblet has been carried out. The lateral spacing of our 3-D riblet surface is sinusoidally varied in the streamwise direction (see Fig. 3). In the comparison of the optimal two-dimensional (2-D) blade riblet which shows 9.9% drag reduction...
Proceedings Papers

Proc. ASME. FEDSM2010, ASME 2010 3rd Joint US-European Fluids Engineering Summer Meeting: Volume 1, Symposia – Parts A, B, and C, 2595-2604, August 1–5, 2010
Publisher: American Society of Mechanical Engineers
Paper No: FEDSM-ICNMM2010-30321
... coefficient can be decreased by 2%, the aerodynamic cooling drag coefficient by more than 50% and the lift coefficient by 5%. Finally, new designs of aerodynamic drag reduction, based on the combined effects of the different investigated parameters, are proposed. Aerodynamic Drag reduction Simplified...
Proceedings Papers

Proc. ASME. FEDSM2007, Volume 1: Symposia, Parts A and B, 247-255, July 30–August 2, 2007
Publisher: American Society of Mechanical Engineers
Paper No: FEDSM2007-37042
... 26 03 2009 In this study, the influence of a drag-reducing surfactant on the turbulent boundary layer under different solution concentrations and temperatures was extensively investigated using a two-component laser-Doppler velocimetry system. It is found that the drag reduction ratio...
Proceedings Papers

Proc. ASME. FEDSM2007, Volume 1: Symposia, Parts A and B, 257-264, July 30–August 2, 2007
Publisher: American Society of Mechanical Engineers
Paper No: FEDSM2007-37056
... 26 03 2009 Turbulent drag reduction realized by hydrogen microbubbles was investigated experimentally. A method of generating microbubbles of 10–60μm diameter by water electrolysis was established. Experiments were performed using a water circulating tunnel. Microbubbles generated...
Proceedings Papers

Proc. ASME. FEDSM2007, Volume 1: Symposia, Parts A and B, 265-274, July 30–August 2, 2007
Publisher: American Society of Mechanical Engineers
Paper No: FEDSM2007-37079
... 26 03 2009 This paper is a progress report of a research project toward practical use of air bubble injection as a drag reduction device for ships. Air bubbles injected into the turbulent boundary layer in water flow are well known to have significant skin friction reduction effect...
Proceedings Papers

Proc. ASME. FEDSM2007, Volume 1: Symposia, Parts A and B, 291-298, July 30–August 2, 2007
Publisher: American Society of Mechanical Engineers
Paper No: FEDSM2007-37242
... Heat Transfer Drag Reduction Coherent Fine Scale Eddy Surfactant Experiments for heat transfer and friction drag of turbulent water flow with surfactant have been conducted to investigate the relations between heat transfer and drag reduction and coherent fine scale eddies in near-wall...
Proceedings Papers

Proc. ASME. FEDSM2007, Volume 1: Symposia, Parts A and B, 307-312, July 30–August 2, 2007
Publisher: American Society of Mechanical Engineers
Paper No: FEDSM2007-37291
... pressure and velocity is high only for the streamwise component of the velocity vector for single phase flow (no microbubbles in the flow). A practical application of these measurements is obtaining data and information to better describe the mechanism responsible for the microbubble drag reduction...
Proceedings Papers

Proc. ASME. FEDSM2007, Volume 1: Symposia, Parts A and B, 1103-1110, July 30–August 2, 2007
Publisher: American Society of Mechanical Engineers
Paper No: FEDSM2007-37117
... Turbulent flow Compliant surface Drag reduction This paper describes a study on interaction between compliant coatings and turbulent boundary layer flows. The use of compliant coatings has been known as the drag reduction means of the skin-friction and was studied by many researchers...
Proceedings Papers

Proc. ASME. FEDSM2002, Volume 1: Fora, Parts A and B, 1131-1136, July 14–18, 2002
Publisher: American Society of Mechanical Engineers
Paper No: FEDSM2002-31342
... This paper discusses experimental results aimed at defining a base drag reduction device based on splitter plates. The unsteady 3D nature of the flow is studied by Schlieren photographies, particle image velocimetry and measurement of the total unsteady lift and drag loads. 04 03 2009...
Proceedings Papers

Proc. ASME. FEDSM2002, Volume 1: Fora, Parts A and B, 411-417, July 14–18, 2002
Publisher: American Society of Mechanical Engineers
Paper No: FEDSM2002-31013
... The investigation results of the supercavitation for high speed motion of prolate axisymmetric bodies in water are presented. The cavitation drag forming and drag reduction problems are considered on base studying of the peculiarities of the supercavitation flows for cavities with given pressure...
Proceedings Papers

Proc. ASME. FEDSM2002, Volume 1: Fora, Parts A and B, 1443-1448, July 14–18, 2002
Publisher: American Society of Mechanical Engineers
Paper No: FEDSM2002-31059
... opposition control is carried out with appropriate timing. 04 03 2009 turbulence boundary layers flow control drag reduction Proceedings of ASME FEDSM'02 2002 ASME Fluids Engineering Division Summer Meeting RB controlled with a relatively simple control scheme. For example, Choi et al...
Proceedings Papers

Proc. ASME. HT-FED2004, Volume 1, 103-110, July 11–15, 2004
Publisher: American Society of Mechanical Engineers
Paper No: HT-FED2004-56119
... Drag reduction Vortex structure Turbulent event Surfactant solution PIV The characteristics of vortex structures and turbulent events of drag-reducing surfactant (CTAC) solution flows in a two-dimensional channel have been studied using particle image velocimetry (PIV) to measure...