# A study of convective flow dynamics using the laser doppler velocimetry technique

by D. Roderick MacLeod

Publisher: s.n.] in [s.l

Written in English
Published: Pages: 180 Downloads: 295
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## Edition Notes

The Physical Object ID Numbers Statement by D. Roderick MacLeod Series Canadian theses = Thèses canadiennes Pagination xiii, 180 p. Number of Pages 180 Open Library OL20013716M ISBN 10 0315556641 OCLC/WorldCa 32090505

Convection is the heat transfer due to the bulk movement of molecules within fluids such as gases and liquids, including molten rock ().Convection includes sub-mechanisms of advection (directional bulk-flow transfer of heat), and diffusion (non-directional transfer of . In the present study, a computer simulation of a simple thermal-driven convective-diffusive flow was performed to clarify the fundamental relation between this Author: S. Komurasaki, K. Kuwahara. Flow and convective cooling in lava tubes S. E. H. S akimoto 1 NASA Goddard Space Flight Center, Geodynamics Branch, Greenbelt, Maryland M. T. Zuber 2 Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Cambridge Abstract. Define convective. convective synonyms, convective pronunciation, convective translation, English dictionary definition of convective. convection Air heated by a space heater rises and is replaced by cool air, creating a convection current that circulates hot air throughout a room. n. The first part of the book reviews the fundamental.

If we travel along the curve $\mathbf x(t)$ through the fluid, then what will be the rate of change of the flow velocity of each point in the fluid that we pass through as we move through the fluid? The answer is called the convective acceleration with respect to the curve $\mathbf x(t)$ and is obtained as follows using the chain rule. Fluid Mechanics: Fundamentals and Applications communicates directly with tomorrow's engineers in a simple yet precise manner. The text covers the basic principles and equations of fluid mechanics in the context of numerous and diverse real-world engineering examples. Mar 15,  · Sped up 30x from actual speed. A Study of Convective Initiation Failure on 22 Oct Jennifer M. Laflin Philip N. Schumacher This study: Five simulations using the WRF-ARW All other model physics and dynamics are set at the default values for the WRF-ARW.

Miniature laser Doppler anemometry system with visible laser diode and avalanche photodiode. Solid-state visualization of a highly three-dimensional flow using stereoscopic particle velocimetry. Application of laser speckle photography in study of convective heat transfer. Oct 01,  · This study presents a summary of the properties of deep convective updraft and downdraft cores over the central plains of the United States, accomplished using a novel and now-standard Atmospheric Radiation Measurement Program (ARM) scanning Cited by: Sajad Alimohammadi, Tim Persoons and Darina B. Murray, A numerical-experimental study of heat transfer enhancement using unconfined steady and pulsating turbulent air jet impingement, 15th Int. Heat Transfer Conference IHTC15, Kyoto, Japan, Sept. , Begell Hourse, IHTC Digital Library, Conference Paper, DOI URL URL. SHORT-TIME FLUCTUATIONS OF THE CONVECTIVE BOUNDARY LAYER HEIGHT AND ENTRAINMENT PROCESSES OBSERVED WITH DOPPLER LIDAR K. Träumner1, A. Wieser, C. Kottmeier and U. Corsmeier Institut für Meteorologie und Klimaforschung a threshold technique using the mean backscatterCited by: 1.

## A study of convective flow dynamics using the laser doppler velocimetry technique by D. Roderick MacLeod Download PDF EPUB FB2

Laser Doppler and Phase Doppler Measurement Techniques obtained using laser-Doppler velocimetry, of mean temperatures, recorded with fine-wire thermocouples, and of mean concentrations of O(2. This paper further describes and characterises the point-based joint measurement technique called thermographic laser Doppler velocimetry (thermographic LDV) technique for flow temperature and velocity measurements.

The flow metrology uses both Mie-scattered light and the optical properties of the phosphorescence. Request PDF | Laser Doppler and Pulsed Laser Velocimetry in Fluid Mechanics | Since the introduction of the laser in the late s, optical metrology has made a major impact in many branches of.

Doppler global velocimetry is a technique based on the selective absorption characteristics of molecular gases that is capable of direct measurement of the Doppler effect. DGV relies on the detection of the Doppler shift of laser light scattered off tracer particles within the local flow.

Its. Velocimetry techniques. Laser Doppler velocimetry (LDV) and particle image velocimetry (PIV) are two standard techniques to measure flow velocities. For both methods tracer particles must be added to the flow, typically in the form of liquid droplets or for reactive Cited by: Unfortunately, the hot-wire technique is intrusive, i.e.

its application may influence the flow field, whereas the laser Doppler velocimetry (LDV) technique is non-intrusive but requires the presence of small tracer particles in the flow in order to determine the flow soundsofgoodnews.com by: 2.

Jul 31,  · Velocity Profile Particle Image Velocimetry Magnetic Fluid Pipe Flow Laser Doppler Anemometry () Velocity measurements at high temperatures by ultrasound Doppler velocimetry using an acoustic wave guide. Exp Fluids – Ein-Mozaffari F, Chan P () Using computational fluid dynamics modeling to study the mixing of.

The Effect of Particle Dynamics on Turbulence Measurements with the Laser Doppler Velocimeter Robert H. Nichols University of Tennessee - Knoxville This Dissertation is brought to you for free and open access by the Graduate School at Trace: Tennessee Research and Creative Exchange.

It has been. 14th Int Symp on Applications of Laser Techniques to Fluid Mechanics Lisbon, Portugal, July, - 1 - Feasibility Study of Tomographic Particle Image Velocimetry for Large Scale Convective Air Flow Matthias Kühn1*, Klaus Ehrenfried1, Johannes Bosbach1, Claus Wagner1.

Mar 19,  · "An Experimental Study of Using Vortex Generators as Tip Leakage Flow Interrupters in an Axial Flow Turbine Stage," (with Chakkaravarthy and Khokhar)," presented and published at the Proceedings of the ASME Turbo Expo Turbine Technical Conference and Exposition GT, June, Oslo, Norway.

Pietri L., Djeridane T., Amielh M., Fulachier L. () Simultaneous Measurements of Temperature and Velocity Combining Cold Wire and Laser Doppler Velocimetry in a Slightly Heated Turbulent Jet.

In: Gavrilakis S., Machiels L., Monkewitz P.A. (eds) Advances in Turbulence VI. Fluid Mechanics and its Applications, vol Springer, DordrechtCited by: 1. Experimental Study of Natural Convective Flow over a pipe heat transfer, etc. In this research, fluid dynamics of natural convective flow over a horizontal rhombus cylinder, with uniform heat flux, is investigated by using two-dimensional Particle Image Velocimetry (PIV) Technique.

Experiments are carried out in a cubical tankAuthor: M. Karbasi pour, M. Nili-Ahmadabadi, G. Taherian, A. Minaean. Processing Doppler Lidar and Cloud Radar Observations.

In order to validate the Pinsky et al. () retrieval technique, the clear air retrievals from the W -band Processing Doppler Lidar and Cloud Radar Observations for Analysis of Convective Mass Flux. MECHANICAL ENGINEERING PROGRAM ACADEMICS. The Mechanical Engineering Program course curriculum is modern and rigorous.

The courses in the program provide a solid foundation in subjects such as mechanical behavior of engineering materials, continuum mechanics, thermodynamics, experimental and numerical combustion, computational fluid dynamics and control theory.

The dimensions of the first and second sets of pores are such that, at fluid flow rates and pressure drops practical for immobilized enzyme reactions, convective flow occurs in both pore sets, and the convective flow rate exceeds the rate of diffusion of the substrate and product to and from immobilized enzymes within the particles.

Mar 19,  · This paper presents recent advances in evanescent wave-based flow diagnostics using fluorescent tracers, including evanescent-wave particle velocimetry applied to flows driven by both pressure and voltage gradients and evanescent-wave fluorescence, which has been used to measure near-wall liquid temperature and pH fields, as well as the surface Cited by: 7.

MEASURING TECHNIQUE Laser Doppler velocimetry instrumentation A four beams two colours laser Doppler velocimeter (Dantec Fiber Flow), in backward scatter configuration, was employed for the present investigation.

The light sources are two diode-pumped solid state lasers with a. In order to improve numerical predictions of the complex endwall flow at low-speed conditions, benchmark quality experimental data are required.

This study documents the flowfield in the endwall region of a stator vane that has been scaled up by a factor of nine while matching an engine exit Reynolds number of Re ex = × 10 soundsofgoodnews.com by: Mar 01,  · The accuracy of time series analysis for laser-Doppler velocimetry, 10 th International Symposium on Application of Laser Technique to Fluid Mechanics.

Lisboa, Portugal, July Google Scholar. Costes J., Couderc J., Study by LDA of the turbulent flow induced by a Rusthon turbine in a stirred tank. Spectral analysis and scale of Author: Tomasz Kurasiński, Czesław Kuncewicz, Jacek Stelmach. In this study, we want to develop a radar tool to esti-mate w proﬁles in convective clouds using Z proﬁles from volumetric radar information.

The inputs needed to develop our radar tool include collocated radar re-ﬂectivities and in-cloud vertical velocity estimates. To achieve this, we combine two wet seasons (October.

For example, in fluid dynamics, the velocity field is the flow velocity, and the quantity of interest might be the temperature of the fluid. In which case, the material derivative then describes the temperature change of a certain fluid parcel with time, as it flows along its pathline (trajectory).

Maddilety, B. P., Saha, A. K., and Panigrahi, P. K., "Study of Orifice Inclination Effect on Synthetic Jet Characteristics using Laser Doppler Velocimetry and Laser Induced Fluorescence", Proceeding of the 5thInternational and 41st National on Fluid Mechanics and Fluid Power, DecemberIIT Kanpur,Kanpur, India ().

RADAR REFRACTIVITY APPLICATIONS FOR CONVECTIVE INITIATION FORECASTING AND OBSERVATIONS OF THE CONVECTIVE BOUNDARY LAYER The dynamics of an active pre-convective environment containing: a dryline, outﬂow boundary, HCRs, internal gravity waves, were thoroughly the study investigates two convective boundary layer cases.

American Institute of Aeronautics and Astronautics Sunrise Valley Drive, Suite Reston, VA STUDY. PLAY. plate tectonics theory. the upper most mantle, along with the overlying crust, behaves as a strong, rigid layer, known as the lithosphere. The lithosphere is divided into segments called plates, which move and continually change size and shape over a weaker region of the mantle known as the astenosphere.

the convective flow of. A detailed analysis of the in-cylinder near-wall flow was carried out on an optical steady flow test bench by using high-resolution particle image velocimetry (PIV) in order to characterize the in-cylinder boundary layer flow in this study.

The difference between the in-cylinder boundary layer and the canonical turbulent boundary layer was. Pressure from particle image velocimetry for convective ﬂows: A Taylor’s deriving pressure from particle image velocimetry (PIV) have proposed multiple approaches, each with its own weakness and strength.

pressure can indeed be obtained from PIV data in turbulent convective ﬂows using the Taylors hypothesis approach, where there Cited by: Lowe KT and Simpson RL “Doppler chirp signal processing for particle acceleration measurement with laser-Doppler velocimetry,” proc. 14 th Coherent Laser Radar Conf., Snowmass, CO, July.

Lowe KT and Simpson RL “Measurements of velocity-acceleration statistics in turbulent boundary layers,” 4 th Intl. Symp. on Turb. convective system (QLCS), are difficult to detect using conventional radars resulting in limited warning lead times of 10 min approximately. In this work, a case study of a cold season QLCS is analyzed.

It is shown the environment was subject to high synoptic force, extremely low convective available potential energy (CAPE), and. Jan 12,  · The effect of phase change on stability of convective flow in a layer of volatile liquid driven by a horizontal temperature gradient - Volume - Roman O.

Grigoriev, Tongran Qin A numerical study of buoyancy-Marangoni convection of volatile binary fluids in confined geometries. International Journal of Heat and Mass Transfer, Vol. Cited by: 8. "Convective Flow and Heat Transfer fromWavy Surfaces: Viscous Fluids, Porous Media, and Nanofluids" book addresses the wavy irregular surfaces in heat transfer devices.

Wavy geometries are used in many engineering systems as a means ofenhancing the transport soundsofgoodnews.com: \$TY - JOUR. T1 - The estimation of convective mass flux from radar reflectivities.

AU - Kumar, Vickal. AU - Protat, Alain. AU - Jakob, Christian. AU - Williams, Christopher RCited by: 5.An experimental study of convective condensation of Ra in an mm inner diameter smooth tube in inclined orientations is presented. This article, being the first of a two-part paper (the second part concentrates on the pressure drops and void fractions), presents flow patterns and heat transfer.