Experimental Study of Vertical and Oblique Particle Clouds in Water

Experimental Study of Vertical and Oblique Particle Clouds in Water
Author: Mohamad Moghadaripour
Publisher:
Total Pages:
Release: 2016
Genre:
ISBN:

Sand jets and particle clouds are common in many engineering areas such as marine bed capping, dredging, and artificial island construction. Because of the wide range of their application, a better understanding of particle cloud's behavior will lead to increase the efficiency of engineering systems and lead to an improvement in predicting the behavior of solid-liquid flows. There are many parameters that can control the behavior of particle clouds behavior such as nozzle diameter do, particle size D50, released mass m, impact velocity of sand particles (at the surface) ui and initial oblique angle of the particle cloud. Moreover, some characteristics of two-phase flows such as entrainment coefficient and drag coefficient can be very important for controlling the impact of the two-phase flow. In this research, laboratory experiments were conducted to find the impact of controlling parameters on the dynamics of vertical and oblique particle clouds in the water media. For considering the impact velocity of sand particles on the surface, the ui was varied by changing the release height H. Nozzle size and mass of particles were grouped to form a non-dimensional parameter as aspect ratio Lo/do, where Lo is a length of sand particles occupied in a pipe with a nozzle diameter of do. It was found that the modified initial energy and circulation are correlated with Lo/do. A direct correlation between the width and frontal velocity of particle clouds with Lo/do was found. These relationships were formulated power law equations and can be used for prediction of cloud size and its frontal velocity. A wide range of particle sizes (D50=0.1375 mm−0.718 mm) was used to study the effects of particle size on spreading of sand jets and particle clouds. Effects of Lo/do and particle size on the evolution of sand particles in water media was also investigated. It was found that particle clouds with small particle sizes (D50=0.1375 mm) formed a sphere shape whereas particle cloud with a large particle size (D50=0.595 mm) forms an arc shape.

Multiphase Flow Dynamics 3

Multiphase Flow Dynamics 3
Author: Nikolay Ivanov Kolev
Publisher: Springer Science & Business Media
Total Pages: 683
Release: 2011-09-25
Genre: Technology & Engineering
ISBN: 3642213723

Multi-phase flows are part of our natural environment such as tornadoes, typhoons, air and water pollution and volcanic activities as well as part of industrial technology such as power plants, combustion engines, propulsion systems, or chemical and biological industry. The industrial use of multi-phase systems requires analytical and numerical strategies for predicting their behavior. .In its fourth extended edition the successful monograph package “Multiphase Flow Daynmics” contains theory, methods and practical experience for describing complex transient multi-phase processes in arbitrary geometrical configurations, providing a systematic presentation of the theory and practice of numerical multi-phase fluid dynamics. In the present third volume methods for describing of the thermal interactions in multiphase dynamics are provided. In addition a large number of valuable experiments is collected and predicted using the methods introduced in this monograph. In this way the accuracy of the methods is revealed to the reader. This fourth edition includes various updates, extensions, improvements and corrections. "The literature in the field of multiphase flows is numerous. Therefore, it is very important to have a comprehensive and systematic overview including useful numerical methods. The volumes have the character of a handbook and accomplish this function excellently. The models are described in detail and a great number of comprehensive examples and some cases useful for testing numerical solutions are included. These two volumes are very useful for scientists and practicing engineers in the fields of technical thermodynamics, chemical engineering, fluid mechanics, and for mathematicians with interest in technical problems. Besides, they can give a good overview of the dynamically developing, complex field of knowledge to students. This monograph is highly recommended,” BERND PLATZER, ZAAM In the present third volume methods for describing of the thermal interactions in multiphase dynamics are provided. In addition a large number of valuable experiments is collected and predicted using the methods introduced in this monograph. In this way the accuracy of the methods is revealed to the reader. This fourth edition includes various updates, extensions, improvements and corrections. "The literature in the field of multiphase flows is numerous. Therefore, it is very important to have a comprehensive and systematic overview including useful numerical methods. The volumes have the character of a handbook and accomplish this function excellently. The models are described in detail and a great number of comprehensive examples and some cases useful for testing numerical solutions are included. These two volumes are very useful for scientists and practicing engineers in the fields of technical thermodynamics, chemical engineering, fluid mechanics, and for mathematicians with interest in technical problems. Besides, they can give a good overview of the dynamically developing, complex field of knowledge to students. This monograph is highly recommended,” BERND PLATZER, ZAAM

Cloud Dynamics

Cloud Dynamics
Author: Robert A. Houze Jr.
Publisher: Academic Press
Total Pages: 457
Release: 2014-07-08
Genre: Science
ISBN: 0080921469

As models of the Earth/atmosphere system and observations become ever more sophisticated, and concerns about climate change and societal impacts of extreme weather and its forecasting grow, understanding the role of clouds in the atmosphere is increasingly vital. Cloud Dynamics, Second Edition provides the essential information needed to understand how clouds affect climate and weather. This comprehensive book examines the underlying physics and dynamics of every specific type of cloud that occurs in the Earth's atmosphere, showing how clouds differ dynamically depending on whether they occur over oceans or mountains, or as parts of atmospheric storms, such as thunderstorms, tropical cyclones, or warm and cold fronts. Covering both the microphysical and macrophysical aspects of clouds, the book treats all of the physical scales involved in cloud processes, from the microscale of the individual drops and ice particles up to scales of storms in which the clouds occur. As observational technology advances with increasingly sophisticated remote sensing capabilities, detailed understanding of how the dynamics and physics of clouds affect the quantities being measured is of paramount importance. This book underpins the work necessary for proper interpretation of these observations, now and in the future. Provides the holistic understanding of clouds needed to pursue research on topics vital to life on Earth Provides in-depth understanding of all types of clouds over all regions of Earth, from the poles to the equator Includes detailed physical and dynamical insight into the entire spectrum of clouds populating Earth's atmosphere

Ice Microdynamics

Ice Microdynamics
Author: Pao K. Wang
Publisher: Elsevier
Total Pages: 287
Release: 2002-09-06
Genre: Science
ISBN: 0080508448

Atmospheric ice particles play crucial roles in cloud and storm dynamics, atmospheric chemistry, climatological processes, and other atmospheric processes. Ice Microdynamics introduces the elementary physics and dynamics of atmospheric ice particles in clouds; subsequent sections explain their formation from water vapor, why ice crystal shape and concentration in cirrus clouds influence the heating of air, and describe how ice crystals cleanse the atmosphere by scavenging aerosol particles. Pao Wang's lucid writing style will appeal to atmospheric scientists, climatologists, and meteorologists with an interest in understanding the role of ice particles in the atmosphere of our planet.