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 111 for “"Pressure Loss"”.
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Pressure loss prediction and control model for water treatment units
… compact water treatment units design, power and pressure drops control modeling and simulations. Computer program software (compact pro) was developed to calculate the pressure losses in piping network and process equipment's. Results obtained for pressure drop unit length for different pipe …
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Aerodynamic Force and Pressure Loss Measurements on Low Aspect Ratio Pin Fin Arrays
… pin fin arrays comes at the expense of increased pressure drop. Therefore the pin fin geometry must be judiciously chosen to achieve the required heat transfer rate while minimizing the associated pressure drop. This project culminates in the measurement of both pin fin force and array pressure …
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Secondary flow, total pressure loss and the effect of circumferential distortions in axial turbine cascades
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1991.
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Experimental Investigation on Heat Transfer and Pressure Loss Characteristics of Rotating Rectangular and Annular Ducts
… assembled. In this study, the heat transfer and pressure loss characteristics of two of these passages are investigated experimentally. The first of the two passages investigated is the passage in between the turbine blade root and disc. This passage has a unique geometry resembling an S-shape. …
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Experimental study of alumina-water and zirconia-water nanofluids convective heat transfer and viscous pressure loss in Laminar regime
… the convective heat transfer and viscous pressure loss characteristics of alumina-water and zirconia-water nanofluids. Nanofluids are colloidal dispersions of nanoparticles in metal, metal oxide, carbon-based materials in base fluids, and may offer improved heat transfer properties …
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Experimental investigation of reversed flow in a compressor cascade
… The investigation included total and static pressure measurements upstream and downstream of the cascade as well as blade surface measurements. Aerodynamic performance parameters were presented for a reversed flow cascade. Comparison of corrected total pressure loss curves suggested that …
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Pressure losses at bends and junctions
… whether the CFD simulations could yield accurate pressure loss data for input into a one-dimensional engine simulation code. The experiments were carried out on a steady flow rig, and three bends with varying degrees of curvature, a T-junction, and a Y-junction were tested. The experiments covered …
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Flow and Heat Transfer in Tubes with Obstacles
… enhance the understanding of heat transfer and pressure loss in heated tubes equipped with flow obstacles by experimentally investigating the axial and circumferential distributions of convective heat transfer in a heated tube, complemented by pressure loss and velocity measurements in an …
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Genetic Algorithm Based Optimization of Baffle Positions in a Forward Osmosis Draw Channel
… if not dominant source of overall osmotic pressure loss across the membrane. Accurate modeling of ICP effects is therefore very critical for accurate Computational Fluid Dynamic (CFD) modeling of asymmetric membranes. A related, dilutive effect known as external concentration polarization …
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Studies of Multipoint Optimization of Transonic Stators
… variable stator blades was able to reduce total pressure loss to be 66.5% of the starting point, while adding in variable stator blades only reduced total pressure loss to 77.5% of the starting point.
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Effects of Free Stream Turbulence on Compressor Cascade Performance
… interest was the behavior of the measured total pressure loss coefficient with and without generated free-stream turbulence. A staggered cascade of nine airfoils was tested at a range of Mach numbers between 0.59 and 0.88. The airfoils were tested at both the lowest loss level cascade angle and …
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An investigation of the dynamic stalling characteristics of rotating axial-flow compressor blades
… response of compressor rotor blade surface pressure profiles to changes in upstream conditions. Data taken while the experimental compressor was operating with a distortion screen upstream of the rotor was utilized to develop a transfer function to describe the dynamic response of the rotor …
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An experimental examination of the effect of trailing edge injection on the aerodynamic performance of gas turbine blades
… to test the effect of blowing rate on the total pressure loss coefficient, L. Tests were conducted at a variety of save cascade exit Mach numbers ranging from 0.79 to 1.36. Measurements were taken at three locations downstream of the cascade blade trailing edges. The algorithm used to calculate …
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Investigation of Aerodynamic Profile Losses for a Low-Reaction Steam Turbine Blade
… refinement of a proprietary empirical profile loss model. A review of the literature shows that experimental data on this type of blade is not openly available. The continued efficacy of empirical loss models to low-reaction steam turbine blades requires data from experiments such as the …
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Investigation of Bio-Inspired Pin Geometries for Heat Transfer Applications
… flows and wake shedding, at the expense of large pressure loss and unsteadiness in the flow. The need to reduce pressure loss and maintain the heat transfer rates are a much needed requirement for a variety of industries to improve the cooling efficiency. One such prominent line of research is …
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Performance prediction model for positive displacement helical screw flowmeters
… logic is that a flowmeter performs at a defined pressure loss for a given speed. This pressure loss times flowrate is then energy balanced against all internal loses. Pressure loss and speed are the reasons for leakage. Rotational speed times the theoretical swept volume is the theoretical …
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Computer aided mathematical modelling of turbulent flow for orifice metering
… quantities of interest such as discharge and pressure loss coefficients. The model vas tested for convergence and general adequacy on an orifice of diameter ratio β= .7 in a 4 inch pipe line and at a Reynolds number of 105. Quantitative tests were then conducted on thin orifice plates in the …
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Effects of Flow Control on the Aerodynamics of a Tandem Inlet Guide Vane
… edge blowing at reducing the blade profile losses and the wake momentum deficit of a cascade of tandem IGV's operating at realistic flow conditions. Two trailing edge blowing designs were tested: metal-angle blowing, which oriented the blowing jets very near to the blade exit angle, and …
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Reynolds stress measurements downstream of a turbine cascade
… a distribution resembling the contours of total pressure loss obtained previously, but is highest in the blade wake where losses are relatively low. The turbulent shear stresses obtained are consistent in sign and magnitude with the gradients of mean velocity. The mass-averaged turbulence kinetic …
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The Effect of Freestream Turbulence on Separation at Low Reynolds Numbers in a Compressor Cascade
… and evaluated through mass-averaged total pressure loss coefficients. The results of the study showed that the best efficiency (lowest pressure loss coefficient) was determined by separation characteristics for any angle of attack. While adding turbulence generally delayed separation, in …
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