Effect Of Flow Nonuniformity Research Articles

Depositional Effects of Flow Nonuniformity and Stratification Within Turbidity Currents Approaching a Bounding Slope: Deflection, Reflection, and Facies Variation

Depositional Effects of Flow Nonuniformity and Stratification Within Turbidity Currents Approaching a Bounding Slope: Deflection, Reflection, and Facies Variation

In situ analysis of protein chromatography and column efficiency using magnetic resonance imaging

Magnetic resonance imaging has been used to visualize size-based protein separations inside operating chromatography columns. The effects of flow nonuniformity have been observed and analyzed quantitatively through concentration profiles of tracers measured inside the column. Analysis of these profiles provides local and averaged intracolumn plate height values for characterization of dispersion and flow nonuniformity. The magnetic resonance measurements compare favorably with conventional chromatographic measurements of column efficiency and provide more detailed insights into nonideal column performance.

EFFECTS OF FLOW NONUNIFORMITY AND RELATIVE ACCELERATION ON DROPLET DYNAMICS

EFFECTS OF FLOW NONUNIFORMITY AND RELATIVE ACCELERATION ON DROPLET DYNAMICS

Steady-state and dynamic characterization of an array of air flat-plate collectors

This paper presents a computer model to predict the performance of an array of air plate solar collectors. Two models are developed under steady-state and dynamic conditions. The steady-state one, derived from the Hottel-Whillier collector model, consists of identifying the products F R U and F R η 0 from experimental results. Under transient conditions, the developed model considers the thermal heat capacities and the evolution with time on the inlet parameters. It presents a good agreement with experimental data. Using this model, the effect of flow nonuniformity on the efficiency curves and the effect of thermal inertia of the header are treated.

Otec cold water pipe design for problems caused by vortex-excited oscillations

Vortex-excited oscillations of marine structures result in reduced fatigue life, large hydrodynamic forces and induced stresses, and sometimes lead to structural damage and to destructive failures. The cold water pipe of an Ocean Thermal Energy Conversion (OTEC) plant is nominally a bluff, flexible cylinder with a large aspect ratio ( L/ D = length/diameter), and is likely to be susceptible to resonant vortex-excited oscillations. The objective of this paper is to survey recent results pertaining to the vortex-excited oscillations of structures in general and to consider the application of these findings to the design of the OTEC cold water pipe. Practical design calculations are given as examples throughout the various sections of the report. This paper is limited in scope to the problems of vortex shedding from bluff, flexible structures in steady currents and the resulting vortex-excited oscillations. The effects of flow non-uniformities, surface roughness of the cylinder, and inclination to the incident flow are considered in addition to the case of a smooth cylinder in a uniform stream. Emphasis is placed upon design procedures, hydrodynamic coefficients applicable in practice, and the specification of structural response parameters relevant to the OTEC cold water pipe. There are important problems associated with the shedding of vortices from cylinders in waves and from the combined action of waves and currents, but these complex fluid/structure interactions are not considered in this paper.

The Hypersonic Source Flow Past Wedges and Cones

SummaryTo study the effects of flow non-uniformities on the hypersonic flow past test bodies, perturbation analysis is applied to the hypersonic source flow past wedges and cones. In both cases it is shown that the effects of the source flow on the shock shape and velocity are small, while effects on the pressure and density are large. Curves are presented for various values of the Mach number from which these effects can be estimated.