Download or read book A Low velocity Airflow Calibration and Research Facility written by L. P. Purtell and published by . This book was released on 1979 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Low velocity Airflow Calibration and Research Facility written by L. P. Purtell and published by . This book was released on 1979 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Low Velocity Airflow Calibration and Research Facility Classic Reprint written by L. P. Purtell and published by Forgotten Books. This book was released on 2017-11-19 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from A Low-Velocity Airflow Calibration and Research Facility There are two essential factors to be considered in the proper development of the forementioned capabilities. One is the quality of the air stream, and the other is the method to be used as the primary stan dard for the measurement of velocity. A suitable facility must avoid blocking effects, have good speed control, and pro vide an air stream with spatial uniformity and steadiness of flow. The approach in this regard was to apply existing design practices that have been established for relatively high velocity flows in wind tunnels to the development of an airflow facility with very low velocities. In general, instruments used to measure air flow velocity use some definite and reproducible effect related to the motion, such as a pressure differential or thrust, convective cooling, sound transmission, transmit time of a tracer particle, and more recently light scattering. The Pitot-static tube which utilizes a difference in pressure produced by the motion of the fluid when con structed according to appropriate dimensions has served as a satisfactory primary standard over a wide range of air speeds, but its use fulness is limited to the higher velocities. The uncertainty in reading small pressure differences increases the uncertainty of speed measurements with decreasing speeds, and the Pitot-static tube cannot meet the desired accuracy requirements at the very lowvelocities. It was felt that of the various 2. Low facility forementioned possibilities, the light scattering method was the most promising for General Description achieving a velocity standard of sufficient accuracy for a calibration capability at low velocities. The advent of the continuous wave laser provided the coherence, mono chromaticity, and intensity of radiation to make this method feasible. It is a method which provides certain advantages in that it is nonintrusive, has a linear response with velocity which can be derived from first principles, and has good spatial resolution. The laser velocimeter is a complex light scattering system dependent on appropriately processing the light scattered from particles moving with the fluid. However, the pro grammatic content and associated instrumenta tion envisaged for the facility made it desirable that it be made to Operate without artificial seeding, and that it respond with sufficient sensitivity to ambient scatterers. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Download or read book NBS Technical Note written by and published by . This book was released on 1979-03 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NIST Handbook written by and published by . This book was released on 1989 with total page 398 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Monthly Catalogue United States Public Documents written by and published by . This book was released on 1979 with total page 1396 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Publications of the National Bureau of Standards Catalog written by United States. National Bureau of Standards and published by . This book was released on 1980 with total page 668 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Publications of the National Institute of Standards and Technology Catalog written by National Institute of Standards and Technology (U.S.) and published by . This book was released on 1980 with total page 648 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Publications of the National Bureau of Standards 1979 Catalog written by United States. National Bureau of Standards and published by . This book was released on 1980 with total page 650 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Monthly Catalog of United States Government Publications written by United States. Superintendent of Documents and published by . This book was released on 1979 with total page 1250 pages. Available in PDF, EPUB and Kindle. Book excerpt: February issue includes Appendix entitled Directory of United States Government periodicals and subscription publications; September issue includes List of depository libraries; June and December issues include semiannual index
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1988 with total page 594 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Download or read book Selected Library Acquisitions written by United States. Department of Transportation and published by . This book was released on with total page 754 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Thermal Measurements in Electronics Cooling written by Kaveh Azar and published by CRC Press. This book was released on 2020-08-26 with total page 496 pages. Available in PDF, EPUB and Kindle. Book excerpt: Filled with careful explanations, step-by-step instructions, and useful examples, this handbook focuses on real-world considerations and applications of thermal measurement methods in electronics cooling. Fifteen experts in thermal engineering combine their expertise to create a complete guide to this complex topic. This practical reference covers all aspects of thermal characterization in electronics cooling and thermal management. The first part of the book introduces the concept of electronics cooling and its associated thermal phenomenon and explains why experimental investigation is required. Subsequent chapters explain methods of measuring different parameters and introduce relevant examples. Sources for locating needed equipment, tables, checklists, and to-do lists are included. Sample calculations and methodologies for error analysis ensure that you can put this valuable information to use in your work.
Download or read book Recent Commerce Department Publications written by and published by . This book was released on 1979-04 with total page 16 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 1968 with total page 668 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Publications written by United States. National Bureau of Standards and published by . This book was released on 1980 with total page 668 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NIST Special Publication written by and published by . This book was released on 2000 with total page 1044 pages. Available in PDF, EPUB and Kindle. Book excerpt:
