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 27 for “"Impinging jets"”.
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Study of Steady and Pulsating Impinging Jets
… on the fluid mechanics of steady and pulsed impinging jets is presented in this thesis. An experimental facility was custom-builtin order to generate axisymmetric and incompressible impinging jets (pulsed and steady). In order to ensure that the velocity profiles at the exit were fully …
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Flow and heat transfer characteristics of turbulent swirling impinging jets [thesis]
Numerous industrial applications rely on impinging jets to impart convective heat and mass transfer in processes ranging from the cooling of electronic devices and gas turbine blades to drying of paper and food products. Conventionally, non-swirling impinging jets have been employed, but some …
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Mixing performance of a novel, continuous confined impinging jets mixer using competitive reactions
… hydroxide was continuously fed to the first impinging jet, while an aqueous solution of hydrochloric acid and ethyl chloroacetate was fed to the second jet. The concentration of ethanol in the final solution was experimentally determined by gas chromatography (GC) to determine the mixing …
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Experimental and Numerical Investigation of Turbulent Heat Transfer due to Rectangular Impinging Jets
… efficient heat and mass transfer potential, impinging jets have received attention in various applications. Heat transfer and flow characteristics of rectangular turbulent impinging jets issued from a 24:1 aspect ratio and 24:1 contraction ratio nozzle were investigated experimentally and …
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Experimental investigation of the effect of sonication on the precipitation of grieseofluvin by impinging jets
… (API) in the nano/micro particle range. Impinging jets is one of the most promising techniques to do so. In this work, a submerged impinging jet system coupled with an ultrasonic probe (sonicator) was used to precipitate Griseofulvin, a common, poorly water-soluble antifungal drug. The …
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Active noise control in supersonic impinging jets using pulsed microjets : actuator design, reduced-order modeling
… the feedback loop inherent in high speed impinging jet flows, thereby significantly reduces the adverse effects. The amount of noise reduced by microjet actuation is known to be dependent on nozzle operating conditions. In this paper, two active control strategies using microjets are …
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Precipitation of micro/nanoparticles in enhanced high energy dissipation mixing systems
… micro/nanoparticles, In this work, a submerged impinging jet system placed inside the tank was used in combination with another energy dissipation device, i,e., a sonicator, to achieve this objective, The hydrodynamics of the typical reactor used in the pharmaceutical industry for this purpose, …
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Flow fields created by impinging liquid jets and applications in cleaning
… (as much as 70%) is used just for cleaning. Impinging liquid jets are frequently used for cleaning operations and currently, almost all industrial cleaning systems are based on empirical results. In an effort to develop efficient and sustainable cleaning systems, I have studied the flow field …
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A theoretical and experimental study of the impingement of two subsonic jets
… the determination of the characteristics of two impinging plane turbulent jets for the purpose of under1tanding the performance of proportional fluid amplifiers and momentum-exchange devices . The jet deflection angle was determined through the application of the free-streamline theory for two …
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Polymer-induced turbulence modifications in an impinging jet
… turbulence characteristics in a submersed liquid impinging-jet configuration. Turbulent impinging jets are commonly used in technological applications such as drying, scouring, cooling or heating due to an enhancement in transport characteristics in the impingement region under certain …
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Polymeric nanocapsules for pharmaceutical applications
… and of its water degradability. Confined impinging jets mixers have been used to produce nanocapsules and results are compared with the ones obtained with nanospheres. CIJMs allows to obtained nanocapsules with controlled size thank to the high mixing efficiency inside the mixing chamber. …
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Design and optimization of an ultra-compact thermal management system integrated with micro-fins for high power applications
… proposed JI-TMS consists of an array of nozzles, impinging fluid onto the heated target surface. The main contributing factor to poor performance of impinging jet thermal management systems is due to the pressure drop across the TMS. Further iterations of the design meet the stretch goal cooling …
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The Impact of Combustor Turbulence on Loss Mechanisms in the High Pressure Turbine
… In a combustor, the turbulence is created by impinging jets in cross flow. This may result in the turbulence being anisotropic in nature. The aim of this thesis is to investigate the effect of combustor turbulence on the loss mechanisms which occur in a turbine blade row. The thesis has a …
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CFD simulation of flow fields associated with high speed jet impingement on deflectors
… used to analyze the formation of under-expanded jets and to investigate the three-dimensional flow field associated with the impingement of free jets onto stationary deflectors. This investigation was performed to develop a verified modeling ability for such problems. Predictions were compared …
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High-power target development for accelerator-based neutron capture therapy
… comparisons between single submerged impinging jets of liquid gallium and water at low flowrates were supplemented with computational fluid dynamics. Experiments using an array of submerged jets were conducted to determine area-averaged Nusselt number correlations for water and gallium …
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Optimization of the thermal-hydraulic performance of the helium-cooled modular divertor with multiple jets
… The helium-cooled modular divertor with multiple jets (HEMJ), which uses 25 impinging jets of helium to cool plasma-facing tungsten tiles, is a leading candidate for DEMO. Experiments were performed on a single HEMJ module to characterize its thermal-hydraulic performance at coolant inlet …
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Effect of gap lenghts of sphere-sphere electrodes on air breakdown level under lightning impulse
Impinging jets are a best method of achieving particularly high heat transfer coefficient and are therefore employed in many engineering applications. In this study we seek to understand the mechanism of the distributed heat on the curve surface with the goal of identifying preferred methods to …
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Numerical study of jet impingement cooling on a smooth curve surface
Impinging jets are a best method of achieving particularly high heat transfer coefficient and are therefore employed in many engineering applications. In this study we seek to understand the mechanism of the distributed heat on the curve surface with the goal of identifying preferred methods to …
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Numerical simulation of heat transfers on a circular cylinder by an impinging jet with nanofluid
Impinging jets are a best method of achieving particularly high heat transfer over a surface circular cylinder, flat plate and concave surface are subjects of interest in many research studies over the past decades. In terms of cooling surfaces in many engineering applications had been devised to …
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Cleaning viscoplastic soil layers from flat surfaces using impinging water jets
Impinging liquid jets are widely used in industry to clean unwanted soil layers from the internal walls of storage tanks and mixing vessels. Viscoplastic layers are common in a wide range of industrial applications and are challenging to clean due to their yield stress behaviour. When a stationary …
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