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 145 for “"Mass flux"”.
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The Mass Flux of Non-renewable Energy for Humanity
<p>The global energy supply relies on non-renewable energy sources, coal, crude oil, and natural gas, along with nuclear power from uranium and these finite resources are located within the upper few kilometers of the Earth’s crust. The total quantity of non-renewable energy resources consumed …
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Characterization of droplet flight path and mass flux in droplet-based manufacturing
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1994.
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Measurements of secondary mass flux from a surface bombarded by an [EMIM][BF4] electrospray plume
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2024-03-01 without embargo terms
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Prediction of mass flux from DNAPL source zone with complex entrapment architecture: model development, experimental validation, and up-scaling
Includes bibliographical references (pages 219-229).
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The effects of orientation angle, subcooling, heat flux, mass flux, and pressure on bubble growth and detachment in subcooled flow boiling
… effects of orientation angle, subcooling, heat flux, mass flux, and pressure on bubble growth and detachment in subcooled flow boiling were studied using a high-speed video camera in conjunction with a two-phase flow loop that can accommodate a wide range of flow conditions. Specifically, …
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Scaling and Performance of a Device for Fluidized Bed Entrainment Reduction
… Relations were proposed for scaling the particle mass flux field above the device. Experimental studies were done on two geometrically similar flow systems, using fluidized beds with diameters of 9.5 cm and 33.3 cm. Measurements were made of the particulate mass flux and gas velocity in the dilute …
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Development of capacitive sensor to determine void fraction in horizontal and vertical tubes
… with R134a in the adiabatic condition and low mass flux range. Visualization results of horizontal flow patterns are compared to Wojtan-Ursenbacher-Thome flow regime map and have a good agreement. Both void fraction results for horizontal and vertical tubes are compared to some widely used …
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Enhanced flow boiling heat transfer in microchannels with structured surfaces at varied mass flow rates
This thesis investigates the role of mass flux on flow boiling heat transfer in microchannels with surface micropillar arrays. The motivation for this investigation was to determine the general trends of the optimal micropillar array geometry in terms of its heat transfer capabilities. The …
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Impacts of Source Zone Architecture on Nonaqueous Phase Liquid Dissolution and Cleanup: A Magnetic Resonance Imaging Study
… (5∼6 pore volumes) resulted in 63% of NAPL mass removal from both aquifers. However, NAPL mass flux reduction was lower from aquifer 2 (68%) with a shorter correlation length than from aquifer 1 (82%). Local effluent concentrations from aquifer 2 increased by as high as 34 times after …
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Experimental investigation of subcooled flow boiling using synchronized high speed video, infrared thermography, and particle image velocimetry
… bar and at subcoolings of 5, 10, and 15 °C. The mass flux values explored were 150-1250 kg/m2/s. The heat flux values explored were 100-1600 kW/m2. As expected, the heat transfer coefficients increased with increasing mass flux in the single-phase convection and partial boiling regions, and …
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Studies on the hydrodynamic equations based on the theory of diffusive volume transport
… per unit volume of fluid differs from the mass flux whenever there are density gradients in the fluid resulting from the molecular transport of heat or mass. In such cases, the Navier-Stokes equations are unable to correctly predict the continuum fields and observed flow phenomena. A new …
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QUANTITATIVE VISUALIZATION OF CARBON DIOXIDE GAS TRANSFER AT A TURBULENT FREE SURFACE
… velocity and concentration, and the turbulent mass flux. Examination of the turbulent mass flux field reveals that downward-traveling fluid, which leaves the concentration boundary layer at the surface and enters the bulk, is responsible for the majority of the gas transfer. This is in contrast …
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Convective boiling of refrigerants near the micro-macroscale transition inside plate heat exchangers
… plate heat exchanger (PHE) operation at low mass flux conditions. While there is interest in this operating regime in the heating, ventilating, air conditioning, and refrigeration industries, especially for part-load conditions, many aspects of the two-phase flow are not well understood for a …
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The use of hot-wire anemometry in studying supersonic slot injection into a supersonic flow
… simultaneously determine total temperature and mass flux. Mean profiles across the entire flow field at three axial stations (x/h = 4, 10, 20) were obtained, as well as the temperature and mass flux turbulence intensities. The probe can be used anywhere except at locations where features of the …
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A Lattice Boltzmann model for diffusion of binary gas mixtures
… systems containing gases of differing molecular masses that are modelled with the ideal gas equation of state. Also, existing methods for implementing boundary conditions are unsuitable for extending to novel boundary conditions, such as diffusion slip. Therefore, a new single component LB …
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Oil Retention and Pressure Drop in Horizontal and Vertical Suction Lines with R410A / POE ISO 32
… POE (polyolester) oil and R410A at a controlled mass flux, OCR (oil in circulation ratio), and apparent superheat, and to directly measure the pressure drop and mass of oil retained in horizontal and vertical suction lines. The bulk vapor velocity and overall void fraction are determined from …
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The void fraction in headers of microchannel heat exchangers
… (saturation temperature at 33 ºC) and low mass flux (40-150 kg/m2s for horizontal tubes and 65-115 kg/m2s for vertical tubes). The study on the two-phase flow in tubes is the baseline and preliminary study of two-phase flow in headers. Flow regimes are captured by a high-speed camera, while …
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Subcooled flow boiling heat transfer and critical heat flux in water-based nanofluids at low pressure
… that nanofluids can improve the critical heat flux (CHF) by as much as 200%. In this study, subcooled flow boiling heat transfer and CHF experiments were performed with low concentrations of alumina, zinc oxide, and diamond nanoparticles in water (< 0.1 % by volume) at atmospheric pressure. It …
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