Download or read book Pressure Fluctuation Measurements in Dilute Polymer Solutions written by D. N. Contractor and published by . This book was released on 1967 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: Measurements of the fluctuating total head in the wake of a flat plate are described with ejection of a dilute polymer solution near the leading edge of the plate. A turbulence probe, consisting of a total-head tube with piezoelectric crystal gage, was specially designed, fabricated and calibrated for this purpose. Turbulence intensities and spectral density distributions were calculated from the measurements, which were made across the wake at a fixed distance downstream of the trailing edge of the plate. The results indicated that the non-dimensionalized profiles of local mean velocity and turbulence intensities in the wake with polymer ejection, are similar to those without any ejection. The shapes of the local spectral density distributions of the turbulent energy over the range of frequencies tested (25-500 cps), are also similar with and without polymer ejection. The total turbulent energy in the wake decreases when polymer solution is ejected and the reduction in total turbulent energy varies with polymer concentration similarly to the reduction in drag on the flat plate. (Author).

Download or read book Effect of Dilute Solutions of Drag Reducing Additives on Wall Pressure Fluctuations written by R. R. Walters and published by . This book was released on 1970 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experiments were conducted in a pipe flow facility to determine the effect of drag-reducing polymer additives on turbulent wall pressure fluctuations. The wide-band and power spectral measurements of wall pressure fluctuations for water were in good agreement with measurements presented in the literature. The power spectra of the wall pressure fluctuations for water taken at three different velocities were found to coincide when nondimensionalized with centerline velocity and pipe diameter. Wall pressure fluctuation data were obtained for two different polymer additives at four different concentrations (100 and 1000 wppm Polyhall (P-295) and 85, 100, and 200 wppm Polyox (WSR-301)). The ratio of the wide-band root-mean-square wall pressure to the dynamic pressure remained approximately the same for the Polyhall solutions as for water while the ratio for Polyox solutions was slightly less than water for most velocities. Spectral data showed reductions in the magnitude of the wall pressure fluctuations up to 20 dB for frequencies greater than 2000 Hz for both polymer solutions as compared to water. For the higher frequencies (2-10 kHz) the reductions varied in magnitude from 7 to 16 dB/octave for different additive concentrations. Degradation of the polymer solutions was systematically shown to decrease the effectiveness of reducing the magnitude of the high frequency wall pressure fluctuations. (Author).

Download or read book Velocity Measurements in Dilute Polymer Solutions written by Carl Alan Friehe and published by . This book was released on 1968 with total page 412 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book NBS Special Publication written by and published by . This book was released on 1971 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Technical Abstract Bulletin written by and published by . This book was released on with total page 828 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1974 with total page 592 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Flow Properties of Dilute Solutions of Polymers Part Ii Equipment for Determining Flow Behavior written by J. Thompsen and published by . This book was released on 1966 with total page 29 pages. Available in PDF, EPUB and Kindle. Book excerpt: Equipment designed to study the effect of polymer additives on fluid flow is described. The objective of the equipment is the following: (1) Visual observation of the boundary layer using stereoscopic techniques. (2) Measurement, by means of a hydrophone, of the change in pressure fluctuations due to the additives. (3) Determination of the accuracy of pitot tube measurements in visoelastic fluids and (4) Determination of the material constants used in the constitutive equation studied. (Author).

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1988 with total page 1020 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Hydraulic Research in the United States and Canada written by United States. National Bureau of Standards and published by . This book was released on 1978 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Report written by United States. National Bureau of Standards and published by . This book was released on 1968 with total page 696 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Hydraulic Research in the United States and Canada 1974 written by Pauline H. Gurewitz and published by . This book was released on 1976 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Government wide Index to Federal Research Development Reports written by and published by . This book was released on 1967 with total page 1352 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Current Hydraulic Laboratory Research in the United States written by and published by . This book was released on 1970 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Hydraulic Research in the United States 1970 written by United States. National Bureau of Standards and published by . This book was released on 1971 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Naval Research Reviews written by and published by . This book was released on 1968 with total page 468 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Mechanics of Underwater Noise written by Donald Ross and published by Elsevier. This book was released on 2013-10-22 with total page 390 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mechanics of Underwater Noise elucidates the basic mechanisms by which noise is generated, transmitted by structures and radiated into the sea. Organized into 10 chapters, this book begins with a description of noise, decibels and levels, significance of spectra, and passive sonar equation. Subsequent chapters discuss sound waves in liquids; acoustic radiation fundamentals; wind-generated ocean ambient noise; vibration isolation and structural damping; and radiation by plate flexural vibrations. Other chapters address cavitation, propeller cavitation noise, radiation by fluctuating-force (dipole) sources, and mechanical noise sources. This book will be helpful as a self-education text and as a reference for workers in the field.

Download or read book Advances in Fluid Mechanics Measurements written by MOHAMED GAD-EL-HAK and published by Springer Science & Business Media. This book was released on 2013-03-08 with total page 611 pages. Available in PDF, EPUB and Kindle. Book excerpt: One cannot overemphasize the importance of studying fluids in motion or at rest for a variety of scientific and engineering endeavors. Fluid mechanics as an art reaches back into antiquity, but its rational formulation is a relatively recent undertaking. Much of the physics of a particular flow situation can be understood by conducting appropriate experiments. Flow visualization techniques offer a useful tool to establish an overall picture of a flow field and to delineate broadly its salient features before embarking on more detailed quantitative measurements. Among the single-point measurements that are particularly difficult are those in separated flows, non-Newtonian fluids, rotating flows, and nuclear aerosols. Pressure, shear stress, vorticity, and heat transfer coefficient are also difficult quantities to measure, particularly for time-dependent flows. These and other special situations are among the topics covered in this volume. Each article emphasizes the development of a particular measuring technique. The topics covered were chosen because of their importance to the field, recent appeal, and potential for future development. The articles are comprehensive and coverage is pedagogical with a bias towards recent developments.