buoyancy driven flows

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Buoyancy Driven Flows

Author : Eric Chassignet
ISBN : 9781107008878
Genre : Science
File Size : 33. 72 MB
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"This book summarizes present understanding of buoyancy-driven flows for advanced students and researchers in oceanography, geophysical fluid dynamics, atmospheric science, and Earth science"--Provided by publisher.

Modifications To The Simple Method For Buoyancy Driven Flows

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ISBN : OCLC:654174300
Genre :
File Size : 72. 40 MB
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Buoyancy Driven Flow In Fluid Saturated Porous Media Near A Bounding Surface

Author : Hitoshi Sakamoto and Francis A. Kulacki
ISBN : 9783319898872
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File Size : 65. 20 MB
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Buoyancy Driven Flow In Fluid Saturated Porous Media Near A Bounding Surface

Author : Hitoshi Sakamoto
ISBN : 3319898868
Genre : Science
File Size : 61. 68 MB
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This Brief reports on heat transfer from a solid boundary in a saturated porous medium. Experiments reveal overall heat transfer laws when the flow along the wall is driven by buoyancy produced by large temperature differences, and mathematical analysis using advanced volume-averaging techniques produce estimates of how heat is dispersed in the porous zone. Engineers, hydrologists and geophysicists will find the results valuable for validation of laboratory and field tests, as well as testing their models of dispersion of heat and mass in saturated media.

Transport And Transients In Buoyancy Driven Flows

Author : Diogo Tomás Bolster
ISBN : OCLC:162551019
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File Size : 50. 12 MB
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Natural and forced displacement ventilation offer promising strategies for cooling buildings in an energy efficient manner. However, there is the issue of whether or not they can provide adequate indoor air quality. Here, we investigate this in two studies - one for passive and the other for particulate contaminants. The complex internal stratification of buoyancy, typical of displacement systems, affects the transport of contaminants in a non trivial manner. While on average traditional and modern low energy ventilation systems are comparable regarding efficiency of contaminant removal, we show that the detailed vertical distribution of contaminants tells quite a different story regarding personal exposure. Further, most previous studies on natural displacement ventilation focus only on steady states, while most true buildings have continuously changing heat loads. Here, two projects on transients in natural displacement ventilation are presented. The first studies the influence of sudden changes in heat loads, while the second focuses on heat sources that vary in a periodic fashion. Many benefits of natural ventilation are observed, including that it is self controlling in a very favorable manner and that a well designed space is capable of handling even very large changes in heat load. This thesis presents a separate investigation of contaminants in coastal aquifers. Due to buoyancy effects, saltwater from the ocean often intrudes into aquifers, which gives rise to a nontrivial flow pattern that is very different from that typical of inland aquifers. Using a simple mathematical model, we investigate the influence of these flow patterns on the transport of conservative contaminants in a coastal aquifer. We find that depending on the specific characteristics of the aquifer that the saltwater intrusion can play a significant role on transport. It forces contaminant towards the upper seaward boundary, thus causing elevated contaminant discharge into the surf zone at beach areas.

A Study On Buoyancy Driven Flows Using Particle Image Velocimetry For Validating The Fire Dynamics Simulator

Author : Andreas Meunders
ISBN : 3958061737
Genre :
File Size : 74. 20 MB
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Buoyancy Driven Flows At The Building And City Scales

Author : 樊一帆
ISBN : OCLC:1015326003
Genre : Air flow
File Size : 43. 80 MB
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Propagation And Entrainment Of Buoyancy Driven Flows In A Narrow Horizontal Space And Implications For Buoyant Contaminant Transport Under Natural Ventilation

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ISBN : OCLC:1032118064
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File Size : 49. 57 MB
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Abstract: Contaminant transport induced by buoyancy-driven flows is crucial for proper ventilation design in buildings. Compared to conventional single-zone spaces, considerably less research has been conducted on the dynamics of buoyant contaminated flows in narrow horizontal spaces with large length-to-width ratios. Experiments were performed to explore the characteristics of natural convection produced by a brine source in a narrow horizontal tank immersed in fresh water. The source was located at the center of the tank ceiling; hence, the buoyancy-driven flow consisted of a plume region and a symmetrical horizontal current. A light attenuation technique was used to measure the density distribution and vertical profile of the horizontal velocity of the current. The current density was vertically stratified, but declined very slowly in the horizontal direction. The head of the horizontal current advanced toward the two ends of the tank at a constant velocity that depended only on the source buoyancy flux. The average thickness of the horizontal current was correlated to the tank height and the source Froude number. In our experiments, the interface between the tail of the horizontal current and the fresh water was very stable, and nearly no mass exchange through the interface was observed. However, mixing between the fresh water and brine occurred in both the plume region and the rearward side of the horizontal current head. Both the total entrainment and the proportion of the entrainment occurring in the head were determined. The latter increased with the source Froude number. Highlights: Experiments examined buoyancy driven flow in a narrow horizontal tank. A model for the flow velocity versus the source buoyancy flow was obtained. The current thickness and entrainment in a narrow horizontal space was obtained. Entrainment in the head of the horizontal current is a contributing factor. The results are references for ventilation and gaseous contaminants control.

Transient Buoyancy Driven Flows In Multi Storey Buildings

Author : Marina Economidou
ISBN : OCLC:930656007
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File Size : 23. 19 MB
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Simulation Of Laminar Buoyancy Driven Flows In An Enclosure

Author : EMEL SELAMET
ISBN : UOM:39015018969199
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File Size : 23. 59 MB
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rectangular cavity, three cells are found in the wide section.

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