Uniform Roughness Studies

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Uniform Roughness Studies

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Author : D. E. Klett
language : en
Publisher:
Release Date : 1992

Uniform Roughness Studies written by D. E. Klett and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with Atmospheric turbulence categories.

Conservation Research Report

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Author :
language : en
Publisher:
Release Date : 1965

Conservation Research Report written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1965 with Agricultural conservation categories.

Experimental Investigation On The Effects Of Surface Roughness On Microscale Liquid Flow

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Author : Tim Brackbill
language : en
Publisher:
Release Date : 2008

Experimental Investigation On The Effects Of Surface Roughness On Microscale Liquid Flow written by Tim Brackbill and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with Fluid dynamics categories.

"Microfluidics has become of interest recently with shrinking device sizes. Roughness structures left from machining processes on the inside of tubes and channels that were once not a concern may now create relative roughness that exceeds 5%. Confusion still exists in the literature as to the extent of the effects of roughness on laminar flow. This work aims to experimentally examine the effects of different roughness structures on internal flows in high aspect ratio rectangular microchannels. A total of four test sections were fabricated to test samples with different patterned rough surfaces, and to also vary the two opposite surfaces forming the long faces of the channel. These test sections allowed the same roughness samples to be tested at varying relative roughnesses and allowed a systematic study on their effects on pressure drop. The first test section looked at sawtooth effects on laminar flow. The second looked at uniform roughness on laminar flow. The third looked at sawtooth roughness in turbulent flow, and the fourth looked at varying pitch sawtooth roughness in laminar flow. Rough surfaces were formed in one of two ways. The first involved making structured repeating sawtooth ridges with a ball end mill on a CNC machine. The second was using sandpaper in a crosshatch pattern to make a more unpatterned roughened surface. In this study, the Reynolds number was varied from 30 to 15,000 with degassed, deionized water as the working fluid. The experimental uncertainty in the experimental data is at worst 7.58% for friction factor and 2.67% for Reynolds number. Roughness structures varied from a lapped smooth surface with 0.2 [micron] roughness height to sawtooth ridges of height 117 [microns]. Hydraulic diameters from 198 [microns] to 2,349 [microns] were tested. The highest relative roughness tested was 24.8%. As a result of the first and second experiments, it was shown that using constricted parameters, sawtooth and uniform roughness performance could be predicted in the laminar regime. In the third experiment, it was shown that certain sawtooth roughness samples cause the results to converge to a single line for friction factor. In the fourth experiment, the pitch of sawtooth elements was shown to be a key parameter in showing when each parameter is applicable. It was found that roughness has an effect even at relative roughness values less than 5%. Lapped smooth samples showed no departure from macroscale theory at all channel diameters tested, which implies that no departure from continuum mechanics occurred at the length scales tested. This fit with what was expected. Early transitions to turbulence were seen however, showing decreasing transition Reynolds number with increasing relative roughness. The lowest turbulent transition occurred at a Reynolds number of 210, with a relative roughness of 24.8%. Most all of the roughness structures studied were found to have experimental results that were well predicted with the use of constricted parameters. However, samples with roughness elements placed at higher pitches were seen to have experimental results approaching theory calculated with root parameters of the channel."--Abstract.

Research In Progress

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Author :
language : en
Publisher:
Release Date : 1973

Research In Progress written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1973 with Military research categories.

Nbs Technical Note

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Author :
language : en
Publisher:
Release Date : 1959

Nbs Technical Note written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1959 with Physical instruments categories.

Estimation Of Roughness Coefficients For Natural Stream Channels With Vegetated Banks

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Author : William F. Coon
language : en
Publisher:
Release Date : 1998

Estimation Of Roughness Coefficients For Natural Stream Channels With Vegetated Banks written by William F. Coon and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with Channels (Hydraulic engineering) categories.

Nbs Special Publication

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Author :
language : en
Publisher:
Release Date : 1966

Nbs Special Publication written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1966 with Weights and measures categories.

Studies In Radar Cross Sections Xl Surface Roughness And Impedance Boundary Conditions

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Author : R. E. HIATT, T. B. A. SENIOR, V. H. WESTON
language : en
Publisher:
Release Date : 1960

Studies In Radar Cross Sections Xl Surface Roughness And Impedance Boundary Conditions written by R. E. HIATT, T. B. A. SENIOR, V. H. WESTON and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1960 with categories.

Scientific And Technical Aerospace Reports

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Author :
language : en
Publisher:
Release Date : 1993

Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with Aeronautics categories.

Hydraulic Research In The United States 1970

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Author : United States. National Bureau of Standards
language : en
Publisher:
Release Date : 1971

Hydraulic Research In The United States 1970 written by United States. National Bureau of Standards and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1971 with Hydraulic engineering categories.