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 66 for “"flashing"”.
-
Performance measurements of a flashing flow nozzle
The performance of a flashing flow nozzle was quantified by efficiency and metastability measurements. Efficiency was calculated over a range of operating conditions, by using both inlet and exit conditions and the nozzle thrust. Metastability was quantified by a parameter that compared the …
-
Measurement of the efficiency of a flashing flow nozzle
The efficiency of a flashing flow converging-diverging nozzle was measured. The primary motivation for measurement of nozzle efficiency in this work was to improve the performance of an ejector as a refrigerant expander; previous experimentation has suggested that motive nozzle efficiency is poor. …
-
Modelling and prediction of flashing flow in short tubes
The objective of this project was to develop a physically realistic method for predicting the flowrates in short tubes. A physically realistic model, though based on tests with one refrigerant, could be extrapolated to other refrigerants and to other refrigeration systems. Most of the existing …
-
Flashing flow of refrigerant HFC-134a through a diabatic capillary tube
… refrigerant flow through a capillary tube is a flashing process, in which the state of the refrigerant changes from subcooled liquid to a vapor-liquid mixture. Metastable phenomena in the flow, i.e. a thermal nonequilibrium phenomena, may exist within a flashing process. Whereas a literature …
-
Improved closure relations for the two fluid-model in flashing flows
… equation, are studied and validated under flashing conditions with additional modifications proposed to improve the accuracy of the models. Three sets of experiments are performed in this work with a closed-loop test facility. Two-phase parameters are measured with four-sensor conductivity …
-
An investigation of high velocity flashing flow in a straight tube.
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1967.
-
Measuring cycling kinematics using a low-cost, flashing LED, multi-camera approach
In this thesis a low cost motion capture approach is presented and applied to measure cyclists' kinematics. The motion capture system consists of low cost hardware and custom developed software. Based on still-frame, off-the-shelf digital cameras, the method represents a solution which is …
-
Assessment of RELAP5 MOD3.3 in predicting the flashing behavior of adiabatic steam-water flows
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-09-01 without embargo terms
-
Phenomena, mechanism, and prediction of flashing instability investigated by experiments, analytical modeling, and numerical simulation
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-12-04 without embargo terms
-
An analysis of residential window waterproofing systems
… This thesis focuses on the window jamb flashing recommendation in ASTM E2112-01 for vinyl nail-on windows by asking the question of whether a vinyl window's integral nail-on flange is by itself an adequate jamb flashing. To answer this question, the Jamb Drip Test was designed and …
-
Evaluation of Traffic Operations at Intersections in Malfunction Flash Mode
… with one of two possible scenarios: (1) flashing yellow on the major street and flashing red on the minor street or (2) flashing red on all approaches. Yellow/red flash is typically the default mode utilized based on the expectation that red/red flash would produce an intolerable amount …
-
Driver Safety and Emissions at Different PPLT Indications
… United States. They are: Circular Green (CG), Flashing Circular Red (FCR), Flashing Red Arrow (FRA), Flashing Circular Yellow (FCY) and Flashing Yellow Arrow (FYA). The main goal of this thesis is to study the driver behavior and analyze safety of drivers for different left turn indications …
-
Vortex control of two-phase refrigerant flow in nozzles and its application in ejector vapor compression cycles
… effect, static pressure profiles of vortex flashing R134a flow expanded through nozzles under various conditions have been measured. A 1D model for the estimation of vapor qualities in the initially subcooled flashing nozzle flow based on the measurement results was also developed. It was …
-
Evaluation of a Prototype System for the Automatic Capture of School Bus Passing Violations
… stop-arm is extended and the red lights are flashing. Public opinion on this issue is very clear. A random phone survey of the public conducted by the National Highway Traffic Safety Administration (NHTSA) reported that more than 90 percent of respondents rated "passing a school bus that has …
-
The Effects of Distraction on the Simple Reaction Time of Normal and Retarded Students
… combinations of loud popular music and bright flashing lights upon an individual's ability to attend to a simple reaction test device.
-
Assessment of Evacuation Network Performance under Different Evacuation Scenarios: The Florida Keys
… by zone, the following strategies were modeled: flashing yellow signals, conflict elimination, contraflow, and emergency shoulder use. From this, it was determined that the modifications to the intersections with traffic control devices – flashing yellow signals and conflict elimination, did not …
-
Magmatic-hydrothermal evolution of the Tuvatu alkalic epithermal Au-Telluride deposit, Viti Levu, Fiji
… which is interpreted to have deposited through flashing. Ore- stage pyrite and marcasite show distinct enrichments in As. Laser ablation-ICP-MS analysis revealed high As and Au incorporation in a specific stage of arsenic-rich pyrite which contains Au as a lattice-bound ion. This study …
-
Development and Evaluation of a Modified VFR Lighted Flyway Marker
… was utilized to determine the most conspicuous flashing pattern for a MVLFM beacon. According to the computer test results, the flashing characteristics of the Morse code letter 'S' resulted in the quickest detection, as confirmed by flight observations. Based upon findings in the literature and …
Page 1 of 4