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Author: Larry Stoddard Christensen
Publisher:
ISBN:
Category : Drops
Languages : en
Pages : 358
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Book Description
Author: Larry Stoddard Christensen
Publisher:
ISBN:
Category : Drops
Languages : en
Pages : 358
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Book Description
Author: Douglas Murray Whelpdale
Publisher:
ISBN:
Category : Fluid dynamics
Languages : en
Pages : 144
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Book Description
Author: Louis J. Battan
Publisher: Courier Corporation
ISBN: 9780486428857
Category : Science
Languages : en
Pages : 180
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Book Description
This text explores the formation of clouds, ice crystals, and hail. It also reviews techniques for cloud modifications, artificial stimulation of rainfall, and modification of hailstorms. 26 figures. 16 halftones.
Author: Davide Peduto
Publisher: Logos Verlag Berlin GmbH
ISBN: 3832540016
Category : Science
Languages : en
Pages : 206
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Book Description
Bearing Chambers in Aero-Engines are located near the rolling-element type of bearings which support the shafts and accomodate the resulting thrust loads. One of the main task of the bearing chambers is, beside an efficient scavenging of the lubricating oil, the cooling of the hot compartments. A very complex two-phase air-oil flow takes usually place in these bearing chambers consisting of oil droplet-laden air flows and shear-driven liquid wall films. The interaction of the droplets with the wall films is significantly influencing the wall heat transfer and the cooling performance of these systems. For this reason, a detailed characterization and modelling of the mass and momentum exchange between droplets and wall films for the unique impingement parameter range in bearing chambers is inevitable. This scientific report investigates the oil droplet impact dynamics for typical impingement regimes relevant to aero-engine bearing chambers. The application of a Direct Numerical Simulation (DNS) technique based on the Volume-of-Fluid (VOF) method and coupled with a gradient-based adaptive mesh refinement (AMR) technique allowed to characterize the drop impact dynamics during various single micro- and millimeter drop impacts onto thin and thick films. With the help of a special numerical treatment, a self-perturbing mechanism is installed that leads to the correct resolution of the crown disintegration process. The numerical methodology was thoroughly validated using the experimental results of millimeter sized drop impacts onto deep liquid pools. These results were developed with an enhanced back-illuminated high-speed imaging and Particle Tracking Velocimetry (PTV) technique. New insights into the cavity penetration, the crown's breakup dynamics and the secondary droplet characteristics following a single drop impact have been developed with the help of the isolated variation of different parameters of influence. Particularly the influence of the Froude number, the impingement angle, and the cavity-wall interaction delivered results to date not reported in scientific literature. Beside the advances in fundamental physics describing the drop impact dynamics with the help of the numerical and experimental results, a set of correlations could also be derived. From these correlations, a drop-film interaction model was formulated that is suitable for the parameter range found in bearing chambers.
Author: Roland J. Pilié
Publisher:
ISBN:
Category : Fog
Languages : en
Pages : 152
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Author: Cornell Aeronautical Laboratory
Publisher:
ISBN:
Category : Fog
Languages : en
Pages : 84
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Book Description
Author: John Robert Adam
Publisher:
ISBN:
Category :
Languages : en
Pages : 80
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Author: Martin Rein
Publisher: Springer
ISBN: 3709125944
Category : Technology & Engineering
Languages : en
Pages : 317
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Book Description
This book presents a comprehensive overview of fluid mechanical, thermal and physico-chemical aspects of drop-surface interactions. Basic physical mechanisms pertaining to free-surface flow phenomena characteristic of drop impact on solid and liquid surfaces are explained emphasizing the importance of scaling. Moreover, physico-chemical fundamentals relating to a forced spreading of complex solutions, analytical tools for calculating compressibility effects, and heat transfer and phase change phenomena occurring during solidification and evaporation processes, respectively, are introduced in detail. Finally, numerical approaches particularly suited for modeling drop-surface interactions are consisely surveyed with a particular emphasis on boundary integral methods and Navier-Stokes algorithms (volume of fluid, level set and front tracking algorithms). The book is closed by contributions to a workshop on Drop-Surface Interactions held at the International Centre of Mechanical Sciences.
Author:
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 622
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Author:
Publisher:
ISBN:
Category : Nuclear engineering
Languages : en
Pages : 616
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Book Description
