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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 38 for “"air bubble"”.
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Air Bubble Screens
Made available in DSpace on 2014-12-13T19:31:49Z (GMT). No. of bitstreams: 1 7913634.pdf: 6810172 bytes, checksum: 1859443d7d47449148af77a14f7d720f (MD5) Previous issue date: 1978
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Phytoplankton induced changes of air bubble residence time in seawater
Air bubbles in the ocean, naturally induced by breaking waves or artificially entrained by ships, remain in the water for different periods of time. Knowledge of the factors accounting for the differences in air bubble residence time (BRT) is essential for understanding processes of air sea-gas …
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Image Analysis of Air-bubble Injection (Front and Side View) into a Turbulent Liquid Stream
"This study concerns an air bubble injection experiments in a vertical upward annular channel in which a 0.4 mm hole was created to inject the air bubbles into the turbulent stream. Water was used as a testing fluid, and the experiments were performed at atmospheric pressure and room temperature. A …
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STUDY OF AIR BUBBLE INJECTION INTO LAMINAR AND TURBULENT WATER FLOW THROUGH AN ANNULAR TEST SECTION
Injection of bubbles into a vertical upward flow of water in an annular flow channel was studied experimentally under laminar and turbulent conditions. In order to measure the size and shape of the bubbles, a flow visualization system was set up in a vertical test section with a high speed video …
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Experimental and simulation studies of two-phase flow in a stirred tank
… of this work was to develop numerical models of air bubble dispersion in a standard stirred vessel with two types of impeller: Rushton turbine and 45⁰ pitched-blade turbine."--Introduction, page 4.
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Hydrophobic Forces in Wetting Films
… using an appropriate surfactant, so that an air bubble can spontaneously adhere on the mineral surface. The bubble-particle adhesion is possible only when the thin film of water between the bubble and particle ruptures, just like when two colloidal particles or air bubbles adhere with each …
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Effects of Flow Rate and Droplet Size on Double Emulsion Morphology
… interactions and morphology of three fluids, an air bubble and oil droplet in water. The experimental results have been compared to a morphology diagram based on the spreading factors that depend on the interfacial tension between two fluids. The possible morphologies are complete engulfment, …
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AN EXPERIMENTAL AND NUMERICAL STUDY ON CAVITATION BUBBLE DYNAMICS AND ITS BIOMEDICAL APPLICATIONS
A thorough understanding of cavitation bubble dynamics is critical to mitigate cavitation damage or develop practical applications. An important field of study is the interaction of a single cavitation bubble with neighbouring structure(s). A cavitation bubble collapse near a finite elastic beam, …
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Surface Forces in Thin Liquid Films
… macroscopic surfaces and foam films between two air bubbles; and between two dissimilar phases, as in wetting films. Stability of the colloids, foams, and wetting films is determined by the surface forces in the TLFs. Depending on the nature of the surfaces involved, the stabilities can be …
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Understanding and developing capabilities for large area and continuous micro contact printing
… achieving precise alignment and registration, air bubble trapping and low production rate still remain unresolved. The goal of this thesis is to conceptualize and implement a low cost solution to these problems to be used by a nano-technology based company in Cambridge, Massachusetts. In this …
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Evaluation of Prototype Cell Delivery Catheters Using Agarose Gel and Cell Culture Experiments
… during insertion of catheters, release of air in the brain and consequent backtracking of dye are some disadvantages with this mode of treatment. We evaluated prototype cell delivery catheters (each with outer and inner catheter) developed to minimize these complications. The catheters (1.6 …
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Deep learning methods for real-time corneal and needle segmentation in volumetric OCT scans
… into the cornea to a precise depth and inject an air bubble to separate the stroma and endothelial layer. Optical coherence tomography (OCT) is used to help surgeons judge the needle insertion depth. However, the needle obscures the part of the cornea underneath it, making it difficult to estimate …
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Computations of bubble dynamics with heat transfer
… the heat transfer enhancement caused by air bubble motion is of practical interest in many industrial applications ranging from boiling solar collectors to nuclear reactors. A bubble sliding over a heated obstacle increases heat transfer by displacing liquid, particularly in the wake …
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A Study of the Motion of Air Bubbles Moving Unrestrained in Water
… to improve understanding of the motion of air bubbles in water, in order to make possible more precise mass transfer calculations.</p><p>An accurate, low cost photographic technique was developed for studying the trajectory of air bubbles rising unrestrained in water.</p><p>The effect of …
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Simulation and mathematical notation of alarms unit for computer assisted resuscitation algorithm
… into patients. Various criteria may vary from an air bubble in the line to varying high and low blood pressure. Using the alarms finite state machine already provided simulation of the alarms unit was done. The alarms finite state machine was constructed by using the requirements [2] provided by …
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Hydrodynamic, acoustic, and electrical characteristics of underwater spark discharges initiated by different mechanisms
… different initiation mechanisms: free discharge, air-bubble-stimulated discharge and wire-guided discharge. Study on the electrical and acoustic parameters of the discharge process has conducted. A capacitive voltage impulse system was developed to energise three different electrode …
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Protein deposition at polymer surfaces:the bulk and surface structure-property effects of hydrogels
… calorimetry (D.S.C.). Hamilton and captive air bubble-contact angle techniques were employed to characterise the hydrogel-water interface and from which by a mathematical derivation, the interfacial free energy (ðsw) and the surface free energy components (ð psv, ðdsv, ðsv) were obtained. …
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A bubble-particle interaction model for flotation combining hydrodynamic and surface forces
… order to predict the flotation rate constant, a bubble-particle interaction model has been developed using a dynamic force balance to determine the trajectory of a particle as it approaches a rising air bubble. The trajectory has been used to determine the probability of bubble-particle …
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Why do mosquitoes use two modes of drinking? An analytical test of a blockage clearing hypothesis
Mosquitoes drink using a pair of in-line muscular pumps in the head that draw liquid food through a long drinking channel termed as proboscis. Experimental investigations of mosquito drinking using synchrotron x-ray indicate two modes of drinking, a predominantly occurring continuous mode in which …
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