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Keywords: rough surfaces
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Journal Articles
Journal:
Journal of Fluids Engineering
Publisher: ASME
Article Type: Research Papers
J. Fluids Eng. April 2010, 132(4): 041203.
Published Online: April 20, 2010
...Karen A. Flack; Michael P. Schultz A review of predictive methods used to determine the frictional drag on a rough surface is presented. These methods utilize a wide range of roughness scales, including roughness height, pitch, density, and shape parameters. Most of these scales were developed...
Journal Articles
Journal:
Journal of Fluids Engineering
Publisher: ASME
Article Type: Research Papers
J. Fluids Eng. June 2009, 131(6): 061205.
Published Online: May 15, 2009
... (of angles 2 deg and 3 deg) installed on the bottom wall of a plane channel. The experiments were conducted over a smooth surface and over transitionally rough and fully rough surfaces produced from sand grains and gravel of nominal mean diameters 1.55 mm and 4.22 mm, respectively. The dimensionless...
Journal Articles
Journal:
Journal of Fluids Engineering
Publisher: ASME
Article Type: Research Papers
J. Fluids Eng. June 2009, 131(6): 061203.
Published Online: May 13, 2009
... for the friction
factor is mostly based on the logarithmic or power law formulations of velocity
profiles in boundary layers. friction factor turbulent flows boundary layers mathematical modeling boundary layer turbulence channel flow friction pipe flow rough...
Journal Articles
Journal:
Journal of Fluids Engineering
Publisher: ASME
Article Type: Technical Papers
J. Fluids Eng. August 2007, 129(8): 1083–1100.
Published Online: March 4, 2007
... Reynolds number. The velocity distribution, just above the roughness level, turns out to be a universal relationship for all kinds of roughness (transitional, fully smooth, and fully rough surfaces), but depends implicitly on roughness scale. The open turbulent boundary layer equations, without any closure...
Journal Articles
Journal:
Journal of Fluids Engineering
Publisher: ASME
Article Type: Technical Papers
J. Fluids Eng. March 2007, 129(3): 325–332.
Published Online: August 29, 2006
...A. S. Ziarani; A. A. Mohamad A molecular dynamics simulation of flow over two side-by-side cylinders with atomically rough surfaces is presented. The model is two-dimensional with 3 × 10 5 liquid argon atoms. The surface roughness is constructed by external protrusion of atoms on the surface...
Journal Articles
Journal:
Journal of Fluids Engineering
Publisher: ASME
Article Type: Technical Papers
J. Fluids Eng. March 2004, 126(2): 257–265.
Published Online: May 3, 2004
..., are employed with different rough surfaces. The nonuniform, irregular, 3-D roughness is characterized using the equivalent sand grain roughness size. Mach numbers along the airfoil range from 0.4 to 0.7. Chord Reynolds numbers based on inlet and exit flow conditions are 0.54 × 10 6 and 1.02 × 10 6...
Journal Articles
Journal:
Journal of Fluids Engineering
Publisher: ASME
Article Type: Technical Papers
J. Fluids Eng. September 2003, 125(5): 871–879.
Published Online: October 7, 2003
... W ∂ Y 2 + ∂ 2 W ∂ Z 2 (3) ∂ U ∂ X + ∂ V ∂ Y + ∂ W ∂ Z = 0 . The above-described liquid flow through a slit microchannel with rough surfaces is governed by Eqs. ( 2 ) and ( 3 ). It should be noted...
Journal Articles
G. Gre´goire, Ph.D. Student, M. Favre-Marinet, Professor, F. Julien Saint Amand, Research Scientist,
Journal:
Journal of Fluids Engineering
Publisher: ASME
Article Type: Technical Papers
J. Fluids Eng. July 2003, 125(4): 636–642.
Published Online: August 27, 2003
... 12 February 2003 27 08 2003 boundary layer turbulence rough surfaces surface topography friction flow simulation computational fluid dynamics interface phenomena Although numerical modeling of turbulent flows is continuously progressing, some questions remain open and need...
Journal Articles
Journal:
Journal of Fluids Engineering
Publisher: ASME
Article Type: Technical Papers
J. Fluids Eng. July 2003, 125(4): 652–659.
Published Online: August 27, 2003
... March 2002 18 March 2003 27 08 2003 rough surfaces two-phase flow cavitation pipe flow pressure measurement flow visualisation The purpose of this work is to describe the two-phase flow structure of sheet cavitation. Cavitation is a sequence of vaporisation...
Journal Articles
Journal:
Journal of Fluids Engineering
Publisher: ASME
Article Type: Technical Papers
J. Fluids Eng. July 2003, 125(4): 670–679.
Published Online: August 27, 2003
... rough surfaces pumps pipe flow laminar to turbulent transitions turbulence As with the flow in a pipe or over a flat plate, energy losses in turbomachinery depend on Reynolds number Re and relative surface roughness ε / d . The efficiency η of a centrifugal pump is thus affected...
Journal Articles
Journal:
Journal of Fluids Engineering
Publisher: ASME
Article Type: Technical Papers
J. Fluids Eng. January 2003, 125(1): 2–9.
Published Online: January 22, 2003
... turbulence rough surfaces flow simulation drag Turbulent flow over rough surfaces is hardly a new research topic. Nikuradse 1 experimented on sandgrain roughness in 1933. Subsequently, numerous experimental studies have been conducted to understand flow phenomena associated with different types...
Journal Articles
Donald J. Bergstrom, Professor,, Nathan A. Kotey, Project Engineer,, Mark F. Tachie, Assistant Professor,
Journal:
Journal of Fluids Engineering
Publisher: ASME
Article Type: Technical Papers
J. Fluids Eng. September 2002, 124(3): 664–670.
Published Online: August 19, 2002
... Division May 23, 2000; revised manuscript received January 30, 2002. Associate Editor: D. R. Williams. 23 May 2000 30 January 2002 19 08 2002 boundary layer turbulence rough surfaces velocity measurement drag Turbulent boundary layers continue to be the subject of both...
Journal Articles
Journal:
Journal of Fluids Engineering
Publisher: ASME
Article Type: Additional Technical Papers
J. Fluids Eng. June 2002, 124(2): 492–499.
Published Online: May 28, 2002
... , “ Turbulent Boundary Layers on Rough Surfaces ,” Exp. Fluids , 4 , pp. 33 – 47 . Perry , A. E. , and Li , J. D. , 1990 , “ Experimental Support for the Attached-Eddy Hypothesis in Zero-Pressure Gradient Turbulent Boundary Layers ,” J. Fluid Mech. , 218 , pp. 405 – 438 . Colebrook...
Journal Articles
Journal:
Journal of Fluids Engineering
Publisher: ASME
Article Type: Technical Papers
J. Fluids Eng. March 2002, 124(1): 127–135.
Published Online: October 15, 2001
... for smooth-wall. Vertical and longitudinal turbulent flux of the shear stress on both smooth and rough surfaces is compared to those predicted by a turbulence model. The present results confirm that any turbulence model must take into account the effects of the surface roughness. Contributed...
Journal Articles
Journal:
Journal of Fluids Engineering
Publisher: ASME
Article Type: Technical Papers
J. Fluids Eng. March 2002, 124(1): 108–117.
Published Online: August 8, 2001
... transitions laser Doppler anemometry boundary layers fluctuations rough surfaces Laminar-to-turbulent flow transition is a phenomenon which continues to be of interest to fluid mechanics scholars. In many technical applications, laminary boundary layers are induced, by roughnesses, to undergo...
Journal Articles
Journal:
Journal of Fluids Engineering
Publisher: ASME
Article Type: Technical Papers
J. Fluids Eng. March 2001, 123(1): 16–21.
Published Online: November 17, 2000
...P. A. Durbin; G. Medic; J.-M. Seo; J. K. Eaton; S. Song A formulation is developed to apply the two-layer k − ε model to rough surfaces. The approach involves modifying the l ν formula and the boundary condition on k . A hydrodynamic roughness length is introduced and related to the geometrical...
Topics:
Surface roughness
Journal Articles
M. F. Tachie, Research Assistant,, D. J. Bergstrom, Professor,, R. Balachandar, Associate Professor,
Journal:
Journal of Fluids Engineering
Publisher: ASME
Article Type: Technical Papers
J. Fluids Eng. September 2000, 122(3): 533–541.
Published Online: February 14, 2000
... anemometer in shallow flows for three different types of rough surface, as well as a hydraulically smooth surface. The flow Reynolds number based on the boundary layer momentum thickness ranged from 1400 to 4000. The boundary layer thickness was comparable with the depth of flow and the turbulence intensity...
Journal Articles
Journal:
Journal of Fluids Engineering
Publisher: ASME
Article Type: Technical Papers
J. Fluids Eng. June 2000, 122(2): 357–363.
Published Online: February 8, 2000
... with a postdoctoral fellowship for the author. Thanks go to B. Kovach at the Center for Corrosion and Biofouling Control at Florida Institute of Technology for measuring the surface profiles of the sandgrain rough surfaces. I also gratefully acknowledge Prof. P. Bradshaw, Prof. K. Flack, and Prof. C. Subramanian...