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Showing 1 to 20 of 38 for “"expansion ratio"”.
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Improvement of Fluidization Ability for Group A Powders by Fine Powder Additives
… The minimum fluidization velocity (Umf), bed expansion ratio (BER), and dense phase expansion ratio (DER) are tested to evaluate the quality of fluidization. Coal-15 can slightly improve the fluidization quality. High content of GB-6 can make the mixture obtain some characteristics of Group …
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Mechanical design, control and optimization of a hybrid solar microgrid for rural electrification and heat supply in sub-Saharan Africa
… improvements (the mechanical design of a high expansion ratio expander) to the more global evaluation of their impact once included into a complex micro-grid system. Special attention has also been paid to the links between thermal and electrical demands. The main contributions of this thesis …
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Numerical Investigation using RANS Equations of Two-dimensional Turbulent Jets and Bubbly Mixing layers
… geometry of the channel which is given by the expansion ratio (channel width to jet thickness) and offset ratio (eccentricity of the jet entrance). Steady solutions to the RANS equations for a two-dimensional turbulent jet injected in the middle of a channel have been obtained. When no …
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Multiscale continuum thermodynamics based modeling of transport mechanisms and starch expansion during extrusion
Expansion is a very critical process that affects the final structural, mechanical and textural characteristics of the extruded products. An understanding of the expansion phenomenon is necessary in order to control and/or improve the functionality of starch products. The hybrid mixture theory …
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Geometry optimization of dry ice blasting nozzle for the noise reduction using experimental validation
… namely divergent length, convergent diameter, expansion ratio, gas inlet diameter, length ratio, and particle inlet angle. The optimum nozzle geometry is fabricated and validated throughout the experimental study on the effect of the impact force and sound pressure level for different …
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Extrusion processing of selected fish feed blends containing distillers dried grains with solubles (DDGS)
… half of the operating costs for aquaculture operations. This study investigated using distillers dried grains with solubles (DDGS) as a sustainable, less expensive alternative protein source for fish feeds. Two extrusion studies using a single-screw extruder and two studies using a twin-screw …
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Systemanalytische Untersuchung einer Brennkammer in faserkeramischer Bauweise von Raketenantrieben
… parameters are among others: chambers mixture ratio, chamber pressure, expansion ratio and coolant mass flow. This report describes the assumptions on which the model is based and lists the equations and methods used to represent the relevant relations of physics.
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Understanding the Effect of Extrusion Processing Parameters on Physical, Nutritional and Rheological Properties of Soy White Flakes Based Aquafeed in a Single Screw Extruder
<p>The rapid expansion of aquaculture has increased the demand for aquafeed. As fishmeal is expensive, alternative plant based protein sources such as soybean has shown to be a good alternative for aquafeed production. The present study was done to investigate the effect of soy white flakes (SWF) …
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Design, development and experimental validation of a lab-scale system for rapid rotational molding of functionally graded integral-skin cellular polyethylene composites
… blowing agent (PBA) into RRFM processing operations in order to enable seamless processing of functionally graded polyethylene foamed composites. The quality of the produced specimen were assessed in terms of: foam density, volume expansion ratio, cell density, and cell size. The …
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Single bubble sonoluminescence
… at constant driving pressure. Furthermore the expansion ratio ( R max / R min ) increases as the ambient pressure is decreased, resulting in a change in the SL radiation. The intensity of SL emission increases about seven times for only a fifteen percent decrease of ambient pressure at constant …
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Experimental investigation of helium injection at a low downstream angle into supersonic flow
… the free stream to determine their mixing, penetration and total pressure loss when injected into a supersonic air cross flow. From this information, the performance of these jets as fuel injectors in a supersonic combustion ramjet (scramjet) combustion chamber was estimated. Both injection angle …
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Cross-Linked PDMS Expansion Due to Submersion in Liquid and Supercritical CO2
… Celsius). Commonly, the composite exhibits expansion ratio from 2.5% to 20%, exhibiting more sensitivity to the percentage content of the metal particles, albeit below those reported in literature for pure cross-linked PDMS. The expansion time-constant is found to be on the order of 100 to …
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Mixed convection in laminar/turbulent separated backward-facing step flows
… on a backward-facing step geometry with an expansion ratio of two. The present laminar study examines a wide range of inlet flow and wall temperature conditions to cover the domain from buoyancy-assisting mixed convective flow, pure forced convective flow, buoyancy-opposing mixed convective …
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Characterization of starch-additive interactions in starch-based systems during twin-screw extrusion
… properties of the extrudates, including expansion ratio, cell size, molecular degradation and degree of crystallinity. Many of the observed trends may also be drastically altered depending upon variety of the starch material used, with particular regard to its amylose:amylopectin ratio. …
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Numerical Simulation of High Expansion Foam Into Conduits and Mine Openings
High expansion foam (Hi-Ex) is a firefighting technology that has been widely used for fire suppression in underground locations. Hi-ex foam can be applied remotely through boreholes from the surface reducing firefighter exposure to fires. Despite the experimental studies that have been carried out …
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Uncertainty assessment for CFD using error transport equation
… due to incomplete grid convergence), (ii) iteration convergence error, (iii) grid generation errors (skewness, grid aspect and expansion ratio, coordinate transformation etc.), and (iv) round-off errors. In this study an in-depth discussion concerning these issues is presented with an emphasis …
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Shock wave interactions at explosive/metallic interfaces
… surface of the armature tubing at a much smaller expansion ratio than predicted by theory. These cracks occurred within about two diameters of the armature end containing the detonator, but the cracks did not extend as would be expected when the tubing expanded under explosive pressurization. Such …
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Investigation of energy storage options for sustainable energy systems.
… systems. A technology description and illustration of concerns regarding each system is presented. Moreover, the possibility of implementing each option into different sources of energy is investigated. Thus, integrated energy systems are developed, utilizing energy storage options with the …
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Reactive modification and crystallization behavior of foamed poly(butylene terephthalate)
… characteristics were functions of extrusion operational variables, such as die set temperature and screw speed. Gas solubility and CBA decomposition kinetics were found to be key elements for controlling and optimizing the quality of the foamed polymer. Initially, the linear PBT polymer was …
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