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All-air moisture and energy recovery system for fuel cell exhaustStill, Michael Joseph 12 1900 (has links)
No description available.
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Modeling and simulation for solid oxide fuel cell power systemBessette, Norman F., II 08 1900 (has links)
No description available.
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Combustion at the interface of an oxidizer-fuel slab systemPanyam, Ramaprasad Ramakrishniah 08 1900 (has links)
No description available.
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Neutron scattering studies and simulations of hydrogen adsorption in single-walled carbon nanotubesFernandez Garcia, Juan January 2008 (has links)
The storage of hydrogen is one of the main problems that needs to be solved before hydrogen can become a real alternative to oil in mobile applications. Physisorption of hydrogen in an adsorbate is one of the possible solutions to this problem. This thesis studies the adsorption of hydrogen in Single-Walled Carbon Nanotubes (SWNTs). Neutron scattering techniques are used to probe the possible adsorption sites and the interaction between the hydrogen and the nanotubes at those sites.
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A study of WOâ†3 and noble metal/WOâ†3 electrodesChen, Kun Yao January 1996 (has links)
No description available.
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The nucleation of eicosane from solution in the presence of close homologuesStewart, A. C. January 1986 (has links)
No description available.
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An Experimental Test Facility for Studying the Effects of Turbulence on the Evaporation of Fuel Droplets at Elevated Pressure and Temperature ConditionsFabbro, Sean 13 April 2012 (has links)
A test rig was developed in an effort to perform droplet evaporation and combustion experiments at high levels of turbulent intensity under elevated pressures and temperatures. The detailed explanation of the design and operation of the various components that are part of the testing apparatus is presented. Once the apparatus was completed, 2D Laser Doppler Velocimetry measurements were used to fully characterize the turbulent field inside the chamber. The results showed that the test rig was capable of producing homogenous isotropic turbulence with a 40 mm central region of the chamber at turbulent kinetic energy levels of up to 5.0 m/s. From the characterization data a correlation of turbulent kinetic energy vs fan speed was produced. The produced correlation is valid at standard conditions as well as elevated pressures and temperatures. After determination of the turbulent field, droplet evaporation experiments were performed, first at standard conditions and then elevated temperature and pressure. The results show that turbulence continued to enhance droplet evaporation at elevated temperature and pressures, 298-348°K and 1-21 bar respectively. Broad conclusions are then drawn from the work performed in the study and recommendations are made for future work and improvements to the test apparatus.
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Thermal transport in porous media with application to fuel cell diffusion media and metal foamsSadeghi, Ehsan 19 October 2011 (has links)
Transport phenomena in high porosity open-cell fibrous structures have been the
focus of many recent industrial and academic investigations. Unique features of these
structures such as relatively low cost, ultra-low density, high surface area to volume
ratio, and the ability to mix the passing fluid make them excellent candidates for
a variety of thermofluid applications including fuel cells, compact heat exchangers
and cooling of microelectronics. This thesis contributes to improved understanding
of thermal transport phenomena in fuel cell gas diffusion layers (GDLs) and metal
foams and describes new experimental techniques and analytic models to characterize
and predict effective transport properties.
Heat transfer through the GDL is a key process in the design and operation of
a proton exchange membrane (PEM) fuel cell. The analysis of this process requires
determination of the effective thermal conductivity as well as the thermal contact
resistance (TCR) associated with the interface between the GDL and adjacent surfaces/
layers. The effective thermal conductivity significantly differs in through-plane
and in-plane directions due to anisotropy of the GDL micro-structure. Also, the high
porosity of GDLs makes the contribution of TCR against the heat flow through the
medium more pronounced.
A test bed was designed and built to measure the thermal contact resistance
and effective thermal conductivity in both through-plane and in-plane directions under
vacuum and ambient conditions. The developed experimental program allows
the separation of effective thermal conductivity and thermal contact resistance. For
GDLs, measurements are performed under a wide range of compressive loads using
Toray carbon paper samples. To study the effect of cyclic compression, which may
happen during the operation of a fuel cell stack, measurements are performed on the
thermal and structural properties of GDL at different loading-unloading cycles.
The static compression measurements are complemented by a compact analytical
model that achieves good agreement with experimental data. The outcomes of the
cyclic compression measurements show a significant hysteresis in the loading and unloading
cycle data for total thermal resistance, TCR, effective thermal conductivity,
thickness, and porosity. It is found that after 5 loading/unloading cycles, the geometrical,
mechanical, and thermal parameters reach a“steady-state”condition and
remain unchanged. A key finding of this study is that the TCR is the dominant
component of the GDL total thermal resistance with a significant hysteresis resulting
in up to a 34 % difference between the loading and unloading cycle data. Neglecting
this phenomenon may result in significant errors in evaluating heat transfer rates and
temperature distributions.
In-plane thermal experiments were performed using Toray carbon paper samples
with different polytetrafluoroethylene (PTFE) content at the mean temperature of
65−70◦C. The measurements are complemented by a compact analytical model that
achieves good agreement with experimental data. Results show that the in-plane
effective thermal conductivity remains approximately constant, k ≈ 17.5W/mK, over
a wide range of PTFE content, and it is approximately 12 times higher than the
through-plane conductivity.
Using the test bed designed for the through-plane thermal conductivity measurement,
the effective thermal conductivity and thermal contact resistance of ERG
Duocel aluminum foam samples were measured under varying compressive loads for
a variety of porosities and pore densities. Also, an experimental program associated
with an image analysis technique is developed to find the size and distribution of
contact spots at different compressive loads. Results show that the porosity and the
effective thermal conductivity remain unchanged with the variation of pressure in the
range of 0 to 2 MPa; but TCR decreases significantly with pressure due to an increase
in contact area. Moreover, the ratio of contact area to cross-sectional area is 0-0.013,
depending upon the compressive force, porosity, and pore density.
This study clarifies the impact of compression on the thermal and structural properties
of GDLs and metal foams and provides new insights on the importance of TCR
which is a critical interfacial transport phenomenon. / Graduate
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The displacement of metals from butylphosphate complexesLloyd, C. J. January 1988 (has links)
No description available.
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Finite element modelling of eddy currents in nonlinear and moving mediaAllen, Nancy January 1997 (has links)
No description available.
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