Journal of Fluids Engineering: Recent submissions

Now showing items 5041-5060 of 9024

    • Force and Power Estimation in Fish-Like Locomotion Using a Vortex-Lattice Method 

      H. Kagemoto; M. J. Wolfgang; Research Engineer; D. K. P. Yue; M. S. Triantafyllou (The American Society of Mechanical Engineers (ASME), 2000)
      The forces and power needed for propelling at constant speed an actively swimming flexible fish-like body are calculated. A vortex-lattice method based on a linearized theory is employed and ...

    • Darcy’s Experiments and the Deviation to Nonlinear Flow Regime 

      J. L. Lage; B. V. Antohe; Technology Development Staff Member (The American Society of Mechanical Engineers (ASME), 2000)
      Many important technological and natural processes involving flow through porous media are characterized by large filtration velocity. It is important to know when the transition from the linear ...

    • Modeling of Flow Transition Using an Intermittency Transport Equation 

      Y. B. Suzen; Postdoctoral Research Associate; P. G. Huang (The American Society of Mechanical Engineers (ASME), 2000)
      A new transport equation for intermittency factor is proposed to model transitional flows. The intermittent behavior of the transitional flows is incorporated into the computations by modifying ...

    • Experimental Simulation of Fish-Inspired Unsteady Vortex Dynamics on a Rigid Cylinder 

      Promode R. Bandyopadhyay; Mechanical Engineer; Martin J. Donnelly; Mechanical Engineer; John M. Castano; Mechanical Engineer; William H. Nedderman; Industrial Designer (The American Society of Mechanical Engineers (ASME), 2000)
      The unsteady hydrodynamics of the tail flapping and head oscillation of a fish, and their phased interaction, are considered in a laboratory simulation. Two experiments are described where the ...

    • Friction Factor in U-Type Undulated Pipe Flow 

      C. O. Popiel; Assoc. Mem. ASME; J. Wojtkowiak (The American Society of Mechanical Engineers (ASME), 2000)
      Measurements of pressure losses in a U-type undulated hydraulically smooth wall pipe, having constant radius curvature, are presented. The effect of the dimensionless curvature radius 2R/d on the ...

    • Pressure Measurements in Highly Viscous and Elastic Fluids 

      Bulent Yesilata; Alparslan Öztekin; Sudhakar Neti; Jacob Kazakia (The American Society of Mechanical Engineers (ASME), 2000)
      Pressure measurements in flows of highly viscous and elastic fluids are of practical importance in polymer processing and rheology systems. Special problems arise during such pressure measurements. ...

    • Limitations of Statistical Design of Experiments Approaches in Engineering Testing 

      Stelu Deaconu; Graduate Research Assistant; Hugh W. Coleman; Eminent Scholar in Propulsion and Professor (The American Society of Mechanical Engineers (ASME), 2000)
      A hypothetical experiment and Monte Carlo simulations were used to examine the effectiveness of statistical design of experiments methods in identifying from the experimental data the correct ...

    • A PIV Algorithm for Estimating Time-Averaged Velocity Fields 

      Carl D. Meinhart; Steve T. Wereley; Juan G. Santiago (The American Society of Mechanical Engineers (ASME), 2000)
      A PIV algorithm is presented for estimating time-averaged or phase-averaged velocity fields. The algorithm can be applied to situations where signal strength is not sufficient for standard cross ...

    • Numerical Study of the Thrust, Energy Consumption, and Propulsive Efficiency of a Three Joint Bending Propulsion Mechanism 

      Motomu Nakashima; Research Associate; Kyosuke Ono (The American Society of Mechanical Engineers (ASME), 2000)
      In our previous paper, we proposed a numerical method based on the discrete vortex method for a bending propulsion mechanism of fish or cetaceans in water, and we demonstrated its validity ...

    • Improvement of the Performance of a Supersonic Nozzle by Riblets 

      Kazumi Tsunoda; Lecturer; Tomohiko Suzuki; Toshiaki Asai (The American Society of Mechanical Engineers (ASME), 2000)
      This paper describes an experimental study of supersonic internal flow over a riblet surface mounted on a channel wall to reduce pressure loss and improve the performance of a supersonic nozzle. ...

    • Effect of Wake Disturbance Frequency on the Secondary Flow Vortex Structure in a Turbine Blade Cascade 

      Christopher G. Murawski; Research Engineer; Kambiz Vafai (The American Society of Mechanical Engineers (ASME), 2000)
      An experimental study of the effect of wake disturbance frequency on the secondary flow vortices in a two-dimensional linear cascade is presented. The flow Reynolds numbers, based on exit ...

    • Suppression of Performance Curve Instability of a Mixed Flow Pump by Use of J-groove 

      Sankar L. Saha; Junichi Kurokawa; Jun Matsui; Hiroshi Imamura; Research Associate (The American Society of Mechanical Engineers (ASME), 2000)
      In order to control and suppress performance curve instability characterized by the positive slope of head-capacity curve of a mixed flow pump, a very simple passive method utilizing shallow ...

    • Mechanics of the Flow in the Small and Middle Human Airways 

      Ashraf Farag; Jeffery Hammersley; Terry Ng; Dan Olson (The American Society of Mechanical Engineers (ASME), 2000)
      Steady divergent flow (inspiration directed) is measured using Laser Doppler Velocimetry in a large-scale model carefully mimicing the morphometry of small human airways. The anatomical features, ...

    • Effect of Relative Impeller-to-Volute Position on Hydraulic Efficiency and Static Radial Force Distribution in a Circular Volute Centrifugal Pump 

      Daniel O. Baun; Graduate Research Assistant and ROMAC Lab Engineer; Lutz Köstner; Project Engineer; Ronald D. Flack; Professor and Department Head (The American Society of Mechanical Engineers (ASME), 2000)
      The hydraulic performance and radial hydraulic force characteristics of a circular volute centrifugal pump are strongly affected by the impeller to volute relative position. For a typical design ...

    • Flow Characteristics of Transitional Boundary Layers on an Airfoil in Wakes 

      H. Lee; S.-H. Kang (The American Society of Mechanical Engineers (ASME), 2000)
      Transition characteristics of a boundary layer on a NACA0012 airfoil are investigated by measuring unsteady velocity using hot wire anemometry. The airfoil is installed in the incoming wake ...

    • Streamwise Curvature Effect on the Incompressible Turbulent Mean Velocity Over Curved Surfaces 

      N. Kim; Research Associate; D. L. Rhode (The American Society of Mechanical Engineers (ASME), 2000)
      A curvature law of the wall, which determines the mean velocity profile, is analytically derived for near-wall turbulent flows to include strong curved-channel wall curvature effects through a ...

    • Rough Wall Turbulent Boundary Layers in Shallow Open Channel Flow 

      M. F. Tachie; Research Assistant; R. Balachandar; D. J. Bergstrom (The American Society of Mechanical Engineers (ASME), 2000)
      An experimental study was undertaken to investigate the effects of roughness on the structure of turbulent boundary layers in open channels. The study was carried out using a laser Doppler ...

    • Use of k−ε−γ Model to Predict Intermittency in Turbulent Boundary-Layers 

      Anupam Dewan; Jaywant H. Arakeri (The American Society of Mechanical Engineers (ASME), 2000)
      The intermittency profile in the turbulent flat-plate zero pressure-gradient boundary-layer and a thick axisymmetric boundary-layer has been computed using the Reynolds-averaged k−ε−γ model, where ...

    • Pulsating Flow in a 90 Degree Bifurcation 

      D. Schinas; D. S. Mathioulakis (The American Society of Mechanical Engineers (ASME), 2000)
      The pulsating flow field in a 90 deg bifurcation was examined by performing LDV measurements in a model with square cross-sections and equal branch flow rates. The three-dimensional separation ...

    • A Simultaneous Variable Solution Procedure for Laminar and Turbulent Flows in Curved Channels and Bends 

      Jianrong Wang; Graduate Research Assistant; Siamack A. Shirazi (The American Society of Mechanical Engineers (ASME), 2000)
      Direct Numerical Simulation of turbulent flow requires accurate numerical techniques for solving the Navier-Stokes equations. Therefore, the Navier-Stokes equations in general orthogonal and nonorthogonal ...