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Showing 1 to 20 of 64 for “"internal flow"”.
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Experimental assessment of the internal flow behavior of supercritical carbon dioxide
… presents an experimental assessment of the internal flow behavior of supercritical carbon dioxide. The investigation focused mainly on assessing condensation onset during rapid expansion of CO₂ into the two-phase region. An experimental blowdown test-rig with a modular test section was …
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Multi-Property Internal Flow Field Quantification using Molecular Filtered Rayleigh Scattering
… for the multi-property quantification of internal flow fields. Validation is challenging in applying computational fluid dynamics (CFD) solutions to real-world scenarios, necessitating benchmark measurements with well-defined uncertainties. The ideal instrument for achieving the required …
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A Numerical Study of Internal Flow Effects on Skin Friction Gages
This work examines the detailed flow characteristics of direct measuring skin friction gages with computational methods. This type of device uses a small movable head mounted flush to a wall such that the head is assumed to be exposed to the same shear stress from the flow as the surrounding wall. …
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PARTICLE REMOVAL IN FLOC BLANKET CLARIFIERS VIA INTERNAL FLOW THROUGH POROUS FRACTAL AGGREGATES
… is best described by finite particle capture via internal flow through flocs, as set by floc properties such as porosity. This mechanism is consistent with the observed changes in performance with floc blanket depth and time.
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Internal flow subjected to an axial variation of the external heat transfer coefficient
A theoretical investigation of internal flow subjected to an axial variation of the external convection coefficient is presented. Since the variable boundary condition parameter causes the problem to become nonseparable, conventional techniques do not apply. Instead, the Green's function technique …
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Internal flow investigation of an aft finocyl grain configuration in a solid rocket motor
Cold-flow tests were conducted in mediums of air and water to investigate the internal flow field about the nozzle region of a proposed solid rocket motor (SRM) configuration that would potentially replace the current external boosters on NASA's Space Shuttle. One-eighth-scale clear acrylic models …
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Numerical study on internal flow structures of subaqueous density underflows and stratified open-channel flows
The internal structure of subaqueous density underflows and stratified open channel flows are examined in this study. Three different flow configurations are used to investigate the effects of density stratification on the internal structure and the responses of the structure as flow conditions …
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Inlet model testing facility preparation, injector calibration and preliminary testing of two two-dimensional inlet models at high incidence angles to study internal flow separation
An experimental study of internal flow separation at high incidence angles for two two-dimensional inlet models is presented. A description of the inlet testing facility includes the injector (which serves to drive the air through the inlet model), its control system, and the Virginia Tech 6-foot …
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Aircraft based measurements of atmospheric Sulfur Dioxide and ground based measurements of gaseous Sulfur (VI) in the simulated internal flow of an aircraft engine: Implications for atmospheric aerosol formation
… and gaseous sulfuric acid measurements in the internal flow of an aircraft gas turbine engine. Both trace gases promote the formation and growth of sulfate aerosol particles which play an important role in the chemistry of the troposphere and perhaps even in climate. An Ion Trap Mass …
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Three-Dimensional Simulations of the Behaviour of Layered Soils under Simple Shear
… tests highlights qualitative differences and internal flow phenomena. Results indicate substantial impact of clay layers on sample strength and liquefaction resistance. While 2D simulations underestimate these effects, 3D analyses show closer alignment with laboratory data. However, the …
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Development of S3D and Adjoint Design Methods for Efficient Aerodynamic Design of Three-Dimensional High-Speed Compressor Blades
… code was developed, based on a 3D compressor flow analysis code, using the discrete adjoint method for the Euler equations. Unlike external flows where any near-field disturbances are attenuated at far-field, internal flow problems create improper interactions of adjoint variables between …
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Modelo numérico de efeitos hidrodinâmicos em escoamentos internos e externos
… work develops a numerical model for external and internal flows to a ship under regular waves. The numerical model consists of the coupling of two methods with different nature, which were evaluated independently in a first stage. The first one is the time domain method based on the panel method …
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Pressure loss prediction and control model for water treatment units
… drop will increase in general for any water internal flow rate. As internal flow rate increased, water pressure drop increase .This result is very important for process designer. Comparisons between results of Compact Pro Software and Pipe flow expert Software for different Input data, shows …
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Two-dimensional, Hydrodynamic Modeling of Electrothermal Plasma Discharges
… called the Three-fluid, 2D Electrothermal Plasma Flow Simulator (THOR). THOR simulates the electron, ion, and neutral species as separate fluids coupled through interaction terms. The two-dimensional modeling capabilities made available in this new code represent a tool for the exploration and …
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Effect of Nozzle Pressure Ratio on Thrust and Flow Behavior in a Supersonic De Laval Nozzle
<p>Supersonic nozzles operate across a range of flow regimes. While an ideally expanded condition yields optimal thrust, practical propulsion systems rarely operate at this design point due to variations in altitude and engine operating conditions. As a result, nozzles frequently operate in …
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Combined convection and other effects in heat transfer in horizontal flows
For many internal flow situations the effect of buoyancy is to cause significant modifications of the internal flow field and heat transfer rate. The present study focuses on combined forced and free convection under laminar flow conditions in horizontal cylindrical ducts. There, the superposition …
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Detached Eddy Simulation of Turbulent Flow and Heat Transfer in Turbine Blade Internal Cooling Ducts
… feasible solutions of high Reynolds number flows undergoing massive separation with reliable accuracy. Since its inception, DES has been applied to a wide variety of flow fields, but mostly limited to unbounded external aerodynamic flows. This is the first study to apply and validate DES to …
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Centrifugal compressor return channel shape optimization using adjoint method
… and boundary conditions were derived for internal flow of an axisymmetric incompressible laminar flow. The adjoint-based gradient calculation was then validated against finite-difference calculations and embedded in a quasi- Newton optimization algorithm. An optimal design was proposed, …
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Problems in feedback queueing systems with symmetric queue disciplines
… We determine the semi-Markov kernel of the internal flow processes and compute their stationary interval distributions and forward recurrence time distributions. For generally distributed service times, we analyze the output process using a continuous state Markov process. We compare the …
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An experimental investigation of instability in turbulent-flow freezing
… solidification of a fully developed turbulent internal flow due to external cooling of the tube wall was conducted. A region of unstable freezing behavior was located and bounded in terms of initial Reynolds number and a nondimensional temperature parameter for the given system. This region was …
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