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 80 for “"pressure-difference"”.
-
Pressure difference-based sensing of leaks in water distribution networks
… The purpose of this thesis project is to develop pressure difference-based sensing cells that can be used in an untethered leak-detection device. This device is to be deployed in water distribution networks to locate leaks so that water loss can be minimized. Design of these sensing cells and of …
-
Is the pressure difference between the oval and round windows the effective acoustic stimulus for the inner ear?
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1995.
-
Finite Element Analysis of Nonlinear Consolidation
… proposed formulation in the form of a constant pressure difference between the pore air and pore water. A method of determination of this pressure difference from laboratory experiments is presented. The proposed compressibility equation of air-water mixture shows stable monotonic decrease with …
-
The effect of synthetic jet driving parameters on heat transfer in microchips cooling channels
… in magnitude and the wave shape as well as the pressure difference between the channel two ends. It was found that these parameters have combined effect on the flow structure as well as the heat transfer rate in the microchannel. When the average jet velocity was at 2.36 msˉ¹(Rej= 130), with a …
-
A study of static and dynamic robustness of hydro/omniphobic surfaces
… that are not flat but distorted due to pressure differences across the interfaces between the asperities. These distorted interfaces play an essential role in the transition from the composite Cassie-Baxter state to the fully-wetted Wenzel state and in the determination of the robustness …
-
Simulation and control of a Marnoch heat engine
… and cool the air in another. This creates a pressure difference. This pressure difference drives a two-way piston connected to a ywheel. A generator connected to the ywheel converts the mechanical energy of the ywheel into electricity. This thesis presents a simulation of the current MHE …
-
Gas forces during the rapid opening of disc valves
… valve seat was withdrawn from the valve while a pressure difference existed across the valve. Simultaneous measurements were made of the force on the valve, the pressure in the plenum chamber and the displacement of the seat from the valve. Dynamic force measurements are compared with values of …
-
Modelling large scale ocean circulation : the role of mixing location and meridional pressure gradients for the Atlantic overturning dynamics
… of the AMOC with a key quantity, the meridional pressure difference is analyzed. Due to the application of a very low diffusive tracer advection scheme, a realistic Atlantic overturning circulation can be obtained that is purely wind driven. On top of the winddriven circulation, changes of …
-
Osmotic mass exchangers for power generation and energy recovery : analysis and analogy to heat exchangers
… process, a subset of forward osmosis (FO) called pressure retarded osmosis (PRO), currently exhibits promise for making desalination more energy efficient and is receiving attention in the literature. PRO exchangers are capable of producing power from two streams of different salinity and …
-
Quantitative Hydrodynamics Analysis of Left Ventricular Diastolic Dysfunction using Color M-Mode Echocardiography
… by a rapid early diastolic relaxation creating a pressure difference within the left ventricle despite the fact the left ventricular volume is increasing. As diastolic dysfunction progresses, the left ventricular relaxation declines and it is hypothesized that the left atrial pressure rises to …
-
A numerical study of the effects of leading edge vortex flaps on the performance of a 75° delta wing
… data and show very good agreement. Individual pressure difference coefficients along the wing and flap are also presented and compared with experimental data. Overall, the method shows the leading edge vortex flap to be very effective in reducing drag while maintaining lift comparable to that …
-
A study of the controllability of air movements in predominantly naturally ventilated houses.
… openings, due to the effects of temperature difference and combined temperature and pressure difference. The method of measurement uses tracer gases which are injected into spaces and their growths and decays are monitored. These concentration histories, when suitably analysed, reveal the …
-
Geometric methods for optimizing ramified flow networks
… conditions are discussed, those of constant pressure difference, constant water flow rate, and constant absorber salinity. Another type of flow network, that of the perceptron, was analyzed from the point of view of its attractors in order to determine which patterns resonated with the …
-
Miniature HCCI Engine Compressor
… in the engine. The engine stalled because pressure could not be held in the cylinder due to blow-by leakage caused by too large of piston/cylinder clearance. The air compressor part of the device was tested independently. It reached a pressure difference of 450 kPa and produced a maximum 11 …
-
The ion exchange behaviour of some trivalent cations in aqueous monoethanolamine
… and tin accompanying reduction in the osmotic pressure difference between resin and solution phases;3) an increase in association between resin anions and counter-ions, giving rise to a lower electrostatic potential of the polymer chains.
-
Primary Driving Force in Wood Vacuum Drying
… and experimentation was to prove that the total pressure difference is the primary driving force during the vacuum drying. The theoretical drying rates of diffusion, free water bulk flow and water vapor bulk flow were calculated and compared. The concept of equilibrium moisture content under the …
-
Reducing cold start hydrocarbon emissions from port fuel injected spark ignition engines with improved management of hardware & controls
… the intake valve opening (IVO) creates a pressure difference across the valve, resulting in strong but brief shear flow to facilitate atomization; delayed IVO also produces a cooler charge due to the expansion process before IVO. It was observed that the in-cylinder equivalence ratio …
-
Membrane Distillation for Leachate Treatment with Fenton Pre-Coagulation Treatment Process
… MD is a technology derived with vapor pressure difference across the hydrophobic membrane which traps the feed-wastewater vapor at the entrance of the hydrophobic side before permeation. In order to modify and assist in membrane technology's common drawback, which is dealing with …
-
Effect of Passive Clean Air Injection Into the Wake Region of a Moving Ground Vehicle
… the flow utilizing a fully passive method, pressure drag can be reduced, increasing the overall performance of the vehicle. To ensure high velocity fluid injection, a venturi shaped roof was implemented with an inlet size of 352mm x 12.7mm, and 2 outlets of size 88.011mm x 25.4mm resulting …
Page 1 of 4