Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 44 for “"air-entrainment"”.
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Theory of air entrainment
Thesis (B.S.)--Michigan State College of Agriculture and Applied Science, 1949
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Air entrainment in vertical dropshafts
… an investigation into the phenomenon of air entrainment in vertical dropshafts conveying water from a high level to a lower level. The study initially commenced with hydraulic tests on scale models of a vortex-entry dropshaft arrangement. This subsequently expanded into a more detailed …
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Hydration and air entrainment of fly ash concrete
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2024-12-01
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An experimental study of air entrainment by breaking waves
… charge the surface layer of the ocean with small air bubbles which play an important role in air-sea gas transfer and in underwater acoustics near the ocean surface. This work reports on a series of laboratory and field experiments on the measurement on air entrainment by breaking waves. The first …
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An experimental study of air entrainment by breaking waves
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1993.
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Super Absorbent Polymers (SAPs) as physical air entrainment in cement mortars
… for using SAPs as a mechanism for physical air entrainment. Mixtures were produced using various quantities of either dry or pre-saturated SAP to replace conventional air entrainment agents (AEAs) along with a conventionally air-entrained control. One additional mixture used lightweight fine …
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The behaviour of Siphon Spillways, with particular reference to air entrainment and model scale effects
This work is a broad study of the mechanisms of air entrainment and air regulation in self-priming, air-controlled siphon spillways. The early chapters of the work provide the reader with the history and general design principles of siphon spillways as well as a comprehensive review of the research …
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Theoretical and numerical study of air entrainment and bubble size distribution in strong free-surface turbulent flow at large Froude and Weber number
Strong turbulence near an air-water interface, characterized by large Froude (Fr) and Weber number (We), leads to significant interactions and exchanges between gas and liquid, resulting in measurable air entrainment. Air entrainment influences a number of physical processes in the nature, …
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Deterministic and stochastic modeling of the water entry and descent of three-dimensional cylindrical bodies
… object impacting the water surface from air and subsequently dropping through the water toward the sea bottom. This deterministic model, MINE6D, accounts for six-degree-of-freedom motions of the body. MINE6D allows for physics-based modeling of hydrodynamic effects due to water impact, …
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Transient model of preheating a submerged entry nozzle
… model of the flame, combustion reactions, and air entrainment has been combined with a transient model of heat transfer in the refractory walls to simulate the SEN preheating process. The model predictions match with experimental measurements of preheating with a natural-gas torch, including …
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Optimization of Concrete Mixtures for Use in Structural Elements
… the structural components and does not contain air entrainment while Class S (AE) is mainly used for bridge decks and contains air entrainment. AHTD requires the same minimum cementitious material content for both classes of concrete. The purpose of this research is to determine if the …
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Simulation and Validation of Two-Component Flow in a Void Recirculation System
… core in case of an accident. Occasionally, air is entrained into the suction piping of ECCS causing voids that decrease pumping efficiency, and consequently damage the pumps. In an attempt to minimize the amount of voids entering the suction side of the pump in ECCS, a Void Recirculation …
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Freeze-Thaw Resistance and Microstructural Characteristics of Concretes Containing Pozzolans
… a study undertaken to determine the effect of air entrainment on workability and air content of fresh concrete incorporating silica fume (SF), metakaolin (MK), fly ash (FA) and blends of FA and MK and to assess the effects of such pozzolans on freeze-thaw durability, air void system and …
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Scour under air entrained jets below dams and flip buckets
… It was. surmised by the writer that plunge pool air entrainment could also be a relevant parameter and apparatus was built to examine this assumption. Two dimensional testing without air indicated scour to be independent of head drop (H) and directly proportional to flow (q), such that x=1.0 and …
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Navier-Stokes simulations of steep breaking water waves with a coupled air-water interface
… of mass, momentum, heat and energy across the air-sea interface. In the context of the near field flow about a surface ship, the breaking bow wave is a key element to the bubbly signature and an appreciable portion of the wave drag of the ship. Yet, despite its direct effect on many aspects of …
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A numerical model study about the impacts of dry air on tropical cyclone formation
The impacts of dry air on tropical cyclone formation are examined in the numerical model simulations of ex-Gaston (2010) and pre-Fay (2008). The former can be regarded as a non-developing system as it failed to redevelop after being downgraded into a remnant low, and the latter developed into a …
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Simulating organization of convective cloud fields and interactions with the surface
… of the lower-free troposphere that reduces dry air entrainment into burgeoning deeper clouds, and thermal mesoscale circulations that can generate moisture convergence and locally forced ascent. To what extent microscale realistic surface heterogeneity and an interactive surface response matter …
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Development of a quasi-dimensional diesel engine simulation for energy and availability analysis
… multi-zone combustion model is based on the air and fuel mixing process with a temperature and concentration dependent fuel burning rate. In order to study the combustion process, several submodels, such as the fuel evaporation and air entrainment, are developed based on critical phenomena. …
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Water Treatment: Fundamentals and Practical Implications of Bubble Formation
… during conventional treatment, including impaired particle settling, filter air binding, and measurement as false turbidity in filter effluent. Coagulation processes can cause supersaturation and bubble formation by converting bicarbonate alkalinity to carbon dioxide by acidification. A model …
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