Download or read book Investigation of Transient Gas Dynamics from Laser energized Nanoparticles written by Farzan Memarian and published by . This book was released on 2013 with total page 97 pages. Available in PDF, EPUB and Kindle. Book excerpt: Soot is formed whenever the combustion of hydrocarbon fuels is incomplete. Since soot particles are very small, they can be inhaled and cause severe health problems, such as pulmonary diseases. They can also cause environmental pollution, and have a significant effect on global warming and melting of polar ice sheets. The environmental and health impact of soot depends strongly on soot particle size and morphology, so there is a pressing need for measuring techniques that characterize aerosolized soot. Laser-Induced incandescence (LII) has proved to be a reliable technique for making spatial and temporal measurements of soot primary particle sizes and soot volume fractions. Nevertheless, there are some unresolved issues in LII, which may cause large errors in soot primary particle size inferred from LII data. One of these issues is anomalous cooling, which is the unexpectedly high initial rate of soot particle cooling observed in experiments, which can not be predicted by LII models. Among the speculations about the possible causes of this phenomenon is the transient gas dynamics effects which have been ignored in LII models. Another phenomena that has been speculated to affect LII predictions in high fluence LII, is how the gas dynamics of sublimed carbon clusters impact the local gas dynamics surrounding the particle during the cooling phase. The focus of this thesis is to investigate transient effects on heat conduction in low fluence LII, and the gas dynamics of sublimed species in high fluence LII using Direct Simulation Monte Carlo (DSMC) method. DSMC is a statistical/numerical method which works based on the physics of Boltzmann equation. In this method a large number of real molecules are represented by the so called simulated molecules and the state of these molecules is tracked during the simulation as they undergo collisions with each other and with the boundaries. The results show that transient effects contribute to anomalous cooling but are not the only cause of this phenomenon. The time scale over which transient effects are significant is also found to be very close to that of anomalous cooling which implies the real cause of anomalous cooling has some similarities to transient effects. Also regarding gas dynamics of sublimation, two effects in particular have been investigated using DSMC, namely, back flux of sublimed species and formation of shock waves. DSMC results confirm the back flux of sublimed species but no shock wave was observed for the boundary conditions considered in this study.
Download or read book An Experimentaland Numerical Investigation of Fast Transient Gas Dynamics written by Gregg Abate and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Investigation of Transient Flow and Heating Problems Characteristic of High Energy Laser Gas Circulation Systems written by Cornelius C. Shih and published by . This book was released on 1977 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt: As a parallel effort to the program initiated to design and fabricate a small scale closed cycle circulator for repetitively pulsed electric discharge lasers at 200 K temperature and high pressures, this investigation was initiated to obtain the fundamental knowledge of fluid and thermal characteristics of the recirculating gas flow in the closed cycle circulator during the pulsed laser operation.
Download or read book Investigation of Transient Flow and Heating Problems Characteristics of High Energy Laser Gas Circulation Systems written by Cornelius C. Shih and published by . This book was released on 1979 with total page 301 pages. Available in PDF, EPUB and Kindle. Book excerpt: Complementing the Army effort on the Closed Cycle Circulator for repetitively pulsed electric discharge lasers, a project was conducted to develop computer programs modeling the recirculating gas flows in pulsed laser operation including steady and unsteady cases; to perform theoretical analysis of the unstable resonator with tilted spherical mirrors; to conduct an experimental investigation of transient fluid and thermal characteristics of the recirculating flow associated with the pulsed laser operation using a subscale circulator; and to experimentally determine the effects of mufflers, screen packs, and honeycombs on acoustic and thermal waves propagated in the recirculating flow. (Author).
Download or read book Investigation of Laser Applications in Gas Dynamic Studies written by Lawrence W. Hicks and published by . This book was released on 1964 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Theoretical Problems in the Spectroscopy and Gas Dynamics of Lasers written by N. G. Basov and published by Springer. This book was released on 2014-02-23 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Investigation of Gas dynamic Flow Problems in Chemical Laser Systems written by A. L. Addy and published by . This book was released on 1974 with total page 219 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book CUDGEL written by A. Thyagaraja and published by . This book was released on 1989 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Closed cycle Gas Dynamic Laser Design Investigation written by W. E. Young and published by . This book was released on 198? with total page 157 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Investigation of Optical Gain in Gas Dynamic Laser Media written by S. Russell and published by . This book was released on 1973 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental program was conducted using a small-scale, arc-augmented gas-dynamic laser with the objective of obtaining comprehensive data for evaluating theoretical predictions of optical gain for such devices over a wide range of potential operating conditions. Included among the program results were attainment of stagnation temperatures higher than those possible in ordinary combustion-driven gas-dynamic lasers, experimental evaluation of the homogeneity of the flow in this device and theoretical determination of the plenum gas composition from the experimentally measured stagnation temperature and pressure. A number of experimental difficulties were encountered during this program which limited the scope of the gain measurements obtained and thereby partially compromised the overall program objective. (Modified author abstract).
Download or read book Closed Cycle Gas Dynamic Laser Design Investigation written by W. E. Young and published by . This book was released on 1977 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Investigation of Gas Dynamic Phenomena Associated with High Power Lasers written by E. Stokes Fishburne and published by . This book was released on 1974 with total page 77 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental and theoretical investigation has been made of the Rocketdyne 75-inch full scale vertical vaned diffuser. Boundary layer blowing, employing several types of injectors and two points of injection, increased the diffuser performance approximately 50% over performance without blowing. Experimental evidence confirmed the theoretical predictions that boundary layer injection near the exit of the supersonic portion of the diffuser, as opposed to injection at the entrance, would provide the best performance. A major problem was the rather poor quality of the flow produced by the temporary air supply and Mach 5 nozzle. The aerodynamic windows in the endwalls of the laser cavity did not significantly affect the diffuser performance. Diagrams are included. (Modified author abstract).
Download or read book Femtochemistry and Femtobiology written by Abderrazzak Douhal and published by World Scientific. This book was released on 2002 with total page 854 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains important contributions from top international scientists on the-state-of-the-art of femtochemistry and femtobiology at the beginning of the new millennium. It consists of reviews and papers on ultrafast dynamics in molecular science.The coverage of topics highlights several important features of molecular science from the viewpoint of structure (space domain) and dynamics (time domain). First of all, the book presents the latest developments, such as experimental techniques for understanding ultrafast processes in gas, condensed and complex systems, including biological molecules, surfaces and nanostructures. At the same time it stresses the different ways to control the rates and pathways of reactive events in chemistry and biology. Particular emphasis is given to biological processes as an area where femtodynamics is becoming very useful for resolving the structural dynamics from techniques such as electron diffraction, and X-ray and IR spectroscopy. Finally, the latest developments in quantum control (in both theory and experiment) and the experimental pulse-shaping techniques are described.
Download or read book Triboelectric Nanogenerators written by Zhong Lin Wang and published by Springer. This book was released on 2016-08-17 with total page 537 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book introduces an innovative and high-efficiency technology for mechanical energy harvesting. The book covers the history and development of triboelectric nanogenerators, basic structures, working principles, performance characterization, and potential applications. It is divided into three parts: Part A illustrates the fundamental working modes of triboelectric nanogenerators with their prototype structures and theoretical analysis; Part B and Part C introduce two categories of applications, namely self-powered systems and self-powered active sensors. The book will be an ideal guide to scientists and engineers beginning to study triboelectric nanogenerators or wishing to deepen their knowledge of the field. Readers will be able to place the technical details about this technology in context, and acquire the necessary skills to reproduce the experimental setups for fabrication and measurement.
Download or read book Nanotechnology Enabled Sensors written by Kourosh Kalantar-zadeh and published by Springer Science & Business Media. This book was released on 2007-09-19 with total page 502 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanotechnology provides tools for creating functional materials, devices, and systems by controlling materials at the atomic and molecular scales and making use of novel properties and phenomena. Nanotechnology-enabled sensors find applications in several fields such as health and safety, medicine, process control and diagnostics. This book provides the reader with information on how nanotechnology enabled sensors are currently being used and how they will be used in the future in such diverse fields as communications, building and facilities, medicine, safety, and security, including both homeland defense and military operations.
Download or read book Nanofluidics written by Efstathios E. (Stathis) Michaelides and published by Springer. This book was released on 2014-05-19 with total page 351 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume offers a comprehensive examination of the subject of heat and mass transfer with nanofluids as well as a critical review of the past and recent research projects in this area. Emphasis is placed on the fundamentals of the transport processes using particle-fluid suspensions, such as nanofluids. The nanofluid research is examined and presented in a holistic way using a great deal of our experience with the subjects of continuum mechanics, statistical thermodynamics, and non-equilibrium thermodynamics of transport processes. Using a thorough database, the experimental, analytical, and numerical advances of recent research in nanofluids are critically examined and connected to past research with medium and fine particles as well as to functional engineering systems. Promising applications and technological issues of heat/mass transfer system design with nanofluids are also discussed. This book also: Provides a deep scientific analysis of nanofluids using classical thermodynamics and statistical thermodynamics to explain and interpret experimental observations Presents the theory and experimental results for both thermodynamic and transport properties Examines all transport properties and transport processes as well as their relationships through the pertinent macroscopic coefficients Combines recent knowledge pertaining to nanofluids with the previous fifty years of research on particulate flows, including research on transient flow and heat transfer of particulate suspensions Conducts an holistic examination of the material from more than 500 archival publications
Download or read book Atomic Layer Deposition for Semiconductors written by Cheol Seong Hwang and published by Springer Science & Business Media. This book was released on 2013-10-18 with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt: Offering thorough coverage of atomic layer deposition (ALD), this book moves from basic chemistry of ALD and modeling of processes to examine ALD in memory, logic devices and machines. Reviews history, operating principles and ALD processes for each device.
