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.
Results
Showing 1 to 20 of 36 for “"reverse flow"”.
-
Periodic reverse flow in microchannel evaporators
Periodic flow reversal which is associated with boiling instabilities is a very commonly seen phenomenon in small scale heat removal applications, for instance, microchannel heat sinks for cooling of electronics. Due to the industry’s strict requirement for thermal stability, previous research on …
-
Flame stabilization and mixing characteristics in a stagnation point reverse flow combustor
… design, referred to as the Stagnation Point Reverse-Flow (SPRF) combustor, was recently developed that is able to operate stably at very lean fuel-air mixtures and with low NOx emissions even when the fuel and air are not premixed before entering the combustor. The primary objective of this …
-
Experimental and Computational Investigation of Thermal-Flow Characteristics of Gas Turbine Reverse-Flow Combustor
<p>Reverse-flow combustors have been used in heavy land-based gas turbines for many decades. A sheath is typically installed to provide cooling at an expense of large pressure losses, through small jet impingement cooling and strong forced convention channel flow. With the modern advancement in …
-
Self-sustained combustion of low grade solid fuels in a stagnation-point reverse-flow combustor
… investigates the use of the Stagnation-Point Reverse-Flow (SPRF) combustor geometry for burning low-grade solid fuels that are attractive for specific industrial applications because of their low cost and on-site availability. These fuels are in general, hard to burn, either because of high …
-
Analysis of Reverse Flow Restriction Device to Prevent Fuel Dryout During Loss of Coolant and Instability Accidents of Boiling Water Reactors
Made available in DSpace on 2017-07-06T18:55:56Z (GMT). No. of bitstreams: 3 Radaideh_Majdi_I_MS.pdf: 3702916 bytes, checksum: d9ab8cfcddc4314d381232b2ad3af591 (MD5) Radaideh_Majdi_I_MS_ABS.pdf: 113055 bytes, checksum: 6dd5088a2264a7ad7262bf468569a820 (MD5) license.txt: 4813 bytes, checksum: …
-
Analysis of reverse flow restriction device to prevent fuel dryout during loss of coolant and instability accidents of boiling water reactors
… (LOCA). The method is based on a device called Reverse Flow Restriction Device (RFRD) and its purpose is to allow the flow in the forward direction, but prevent the flow in reverse direction which occurs in multiple accident scenarios. In this thesis, detailed TRACE/PARCS simulations have been …
-
AGRICULTURAL SPRAYS IN NON-UNIFORM CROSS-FLOW
… Phase-Doppler Particle Analyzer. A sheared cross flow pattern, having lower velocities near the wind tunnel floor and increasing velocities with increasing distance towards the wind tunnel roof was used. The nozzle was located in the region of high shear. The study was conducted in four stages. In …
-
An experimental study of exit flow patterns in a multistage compressor in rotating stall
… measurements of a high-speed, 10- stage, axial-flow compressor operating in rotating stall are analyzed. Procedures used to digitize analog voltages and calibrate pressure transducers are presented. From total and static pressures measured at the exit of the test compressor, stall cell Mach …
-
Heat Transfer and Flow Measurements in Gas Turbine Engine Can and Annular Combustors
… investigating the correlation between combustor flow field geometry and convective heat transfer at cold flow conditions for Reynolds numbers of 50,000 and 80,000. Flow velocities were measured using Particle Image Velocimetry (PIV) along the center axial plane and radial cross sections of the …
-
Aerodynamic study of a small, ducted VTOL aerial vehicle
… to smaller diffusers, contrary to theory. Reverse flow within the core appears to disrupt uniform exit flow and yields a conically divergent turbulent wake. Results of this study will be used in the redesign of a duct core fairing, which will act to control the airflow and reduce the …
-
Fuel-NOx Formation during Low-Grade Fuel Combustion in a Swirling-Flow Burner
… tests in a pilot-scale (0.2 MW), swirling flow burner. Two-dimensional gas species mole fraction data were collected with state-of-theart instruments from nine experiments, composing one herbaceous biomass (straw), one woody biomass (sawdust), a low sulfur sub-bituminous coal (Blind Canyon) …
-
DESIGN & DEVELOPMENT OF HETEROTOPIC TRANSCATHETER TRICUSPID VALVES TO AMELIORATE TRICUSPID REGURGITATION
… and inferior vena cava will prevent the back flow of blood into the venous structures and minimises the detrimental effect of reverse flow. The hemodynamic characteristics of these valves were tested in a mock circulatory system (MCS) which emulated the patho-physiological pressure and flow …
-
One-Dimensional, Finite-Rate Model for Gas-Turbine Combustors
… Special procedures were devised for the flow-division of the inlet flow into primary- and annular-flows, for both straight- and reverse-flow combustors. This allows the model to handle complete combustor configurations, which at present are beyond the reach of more sophisticated CFD …
-
Detection of Bacterial Retroelements Using Genomics
<p>The reverse flow of genetic information can occur when a special DNA polymerase called Reverse Transcriptase (RT) copies the genetic information in an RNA molecule back into a complementary DNA. One type of RT encoding gene found in bacteria is called a retron element. Recent bacterial genome …
-
Flow characteristics of a transverse water jet into an unconfined water channel
The flow pattern of a transverse jet in a crossflow is complex due to the interaction between the jet and the crossflow. This interaction plays a significant role in practical fluid mixing including effluent discharge in water, film cooling and chemical mixing chamber. In this research, the flow …
-
Biomass reforming processes in hydrothermal media
… gasification of biomass, a supercritical-water reverse-flow vessel (RFV) may be employed to precipitate the salts from the biomass before the biomass is brought into contact with catalysts. However, these vessels are subject to blockage, and flow characterization within the vessels has largely …
-
Development of a geometric model for the study of propagating stall inception based on flow visualization in a linear cascade
Flow visualization movies of flow through a cascade of compressor blades showed propagating stall at stagger angles of 36.5 and 45 degrees for angles of attack of 20 degrees and higher. At a stagger angle of 25 degrees, the development of a steady, separated boundary layer occurred with no …
-
Numerical Simulation of Cold Front-Related Hydrodynamics of Wax Lake Delta
… for ~25% of water flux. (2). The current flows follow the wind direction change. Along-channel current dominates while cross-channel water transport occurs at the southwester lobe during post-frontal passage. The long-term impact on sediment transport will be the lobe shift to …
-
Product Returns in Closed Loop Demand Chains
"The flow of products usually occurs from manufacturers to consumers. In recent years the reverse flow---the number of items moving from consumers to manufacturers---has been gaining momentum. These returns can occur in a variety of ways, from customers taking advantage of a refund policy to …
Page 1 of 2