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 28 for “"Mass and Heat transfer"”.
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ΜΕΤΑΒΑΤΙΚΗ ΚΑΤΑΣΤΑΣΗ ΛΕΙΤΟΥΡΓΙΑΣ ΟΞΕΙΔΩΤΙΚΗΣ ΠΑΓΙΔΑΣ ΣΩΜΑΤΙΔΙΩΝ ΚΑΥΣΑΕΡΙΟΥ ΚΙΝΗΤΗΡΩΝ DIESEL
… IS PRESENTED BASED ON TRAP INLET CONDITIONS AND TRAP HISTORY. THE MODEL INCORPORATES (A) THE FORMULATION OF FLOW CONDITIONSIN THE TRAP (B) THE FUNDAMENTAL MASS AND ENERGY BALANCE OF THE SYSTEM (C) THE FORMULATION OF THE OXIDATION PROCESS THROUGH CHEMICAL KINETICS AND (D) THE DESCRIPTION OF …
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Development of a microchannel reactor model
The development and future wide-spread use of hydrogen fuel cells is inhibited by problems associated with hydrogen storage. A possible alternative is to store and then reform hydrocarbons to yield hydrogen in an on-board fuel processing system. Microchannel reactors have reduced mass and heat …
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Continuous processing of multiphase reactions for pharmaceutical applications
… to expedite new drug development, reduce cost and increase availability of existing drugs, and improve stability and safety of pharmaceutical manufacturing, the continuous flow synthesis has appeared as an attractive alternative to the conventional batch processes. Numerous technologies have …
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RESEARCH AND DEVELOPMENT OF PLANT-BASED FISHBALL ANALOGUES MADE FROM SOY PROTEIN AND KONJAC GLUCOMANNAN
The demand for seafood is increasing, leading to concern for the sustainability of current seafood supplies. The concern and the increasing dietary shift towards vegetarianism encourage the development of plant-based seafood alternatives. Mimicking the texture and sensory characteristics of …
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Modeling and simulation of oil transport and transformation for studying piston deposits
… of carbonaceous engine deposits is a long standing and well documented phenomenon limiting the lifetime of diesel engines. Carbon remnants coat the surfaces of the combustion chamber, piston, and valves. As piston deposits thicken, they increase the risk of a power cylinder seizure. More …
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Molecular Dynamics Studies of Thin-Film Evaporation: The Effect of Graphene-Coated Silicon on Water Evaporation Behavior
… methods are insufficient to dissipate the high heat flux of next-generation electronic systems. Thin-film evaporation is one of the most promising solutions, because it takes advantage of the large amount of latent heat in the phase change process. It is important to understand the relationship …
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Experimental study of heat transfer and fluid flow in unsaturated porous media
… experiment was conducted to investigate thermal and fluid flow behavior in an unsaturated porous medium. The experiment consisted of a bed of homogeneous glass beads packed uniformly in a Lexan rectangular box. A cylindrical heat source was located horizontally in the middle region of the bed and …
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Modeling and measurement of sodium chloride and ammonium sulfate droplet growth in laminar flow
… balance between vapor diffusion, Kelvin effect, and Raoult’s law, as expressed in K¨ohler theory. In this study, a thermodynamic droplet growth framework initially developed by Brewster and Li (2021) for radiation-induced cooling of pure water droplets is extended to include the effects of …
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Mechanistic Simulation of Solvent-aided Gravity Drainage of Bitumen
… an alternative method for recovering heavy oil and bitumen to reduce the viscosity and density of the bitumen. In this study, solvent assisted thermal gravity drainage is modelled in CMG STARS using propane as the solvent. First, the modeling of thermosphysical properties of bitumen and propane …
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Kinetics and Reaction Engineering Aspects of Syngas Production by the Heterogeneously Catalysed Reverse Water Gas Shift Reaction
… the development of a process for CO2 utilisation and/or syngas production, the catalytic hydrogenation of CO2 using commercial Ni/Al12O19 and Al2O3 catalysts was studied. The experiments were performed in a down-flow fixed bed quartz reactor at atmospheric pressure. The reverse water gas shift …
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MORPHOLOGICAL AND ISOZYMAL VARIATION IN THE SEA-STAR ASTERIAS FORBESI(DESOR)
… the hydrogenation of carbon monoxide to methane and methanol were carried out over iron-titanium alloy catalysts, in a continuous flow fixed bed differential reactor. The catalysts studied included FeTi, Fe(,1.5)Ti and Fe(,2.5)Ti alloys with pure Fe used as a comparison. The catalysts used were …
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Micro-Scale Simulation of Evaporation, Condensation and Transport in Porous Media
… Analysis deals with measurements of virtual core and the purpose of such modeling is to replace conventional and special core analysis when the latter are not feasible. One of the challenging concepts in micro-scale simulation of porous media is consideration of phase change phenomena. Mass and …
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Modelling, Simulation and Optimisation of Multistage Humidification and Dehumidification Desalination Plant Using Solar Energy. Performance Evaluation and Improvement of the Humidification-Dehumidification Desalination Process through Modelling, Simulation and Optimisation Techniques
Serious social and economic disruptions are unfolding worldwide over the finite water and energy resources; hence, securing fresh water supply and employing renewable energy sources will help avoid catastrophic conflicts, continue modern lifestyles, and circumvent global warming and pollution. For …
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Microreactor technology : scale-up of multiphase continuous flow chemistries
… for the synthesis of chemical compounds and kinetic studies at the laboratory scale. High heat and mass transfer rates, rapid mixing, and higher selectivities and conversions can be achieved in these microdevices thanks to the small characteristic dimensions, enabling the synthesis of …
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Moisture occurrence in roof assemblies containing moisture storing insulation and its impact on the durability of building envelope
… segment of the residential market, both in new and retrofit construction. Moisture deposited by exfiltration and adsorbed within the envelope reduces the thermal performance of the envelope and favors fungus growth leading to deterioration of the materials and contamination of the indoor air. …
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Monolith Catalyst Supports for Hydrogen Production
Due to increasing energy demands and environmental concerns, more research studies arc conducted on alternative energy sources. Hydrogen fuel cells arc one of the desired alternatives. The CCT Catalysis Institute has demonstrated the entire hydrogen production process from propane (LPG) reforming. …
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Microfluidic-generated Double Emulsions for Cell Study, Drug Delivery and Particle Therapeutics Fabrication
… is a powerful platform for both fundamental and applied biomedical research. The droplets are small in size with a diameter of 1-300 um. Thus, they could function as a miniaturized environment for quantitative and qualitative analysis. Each droplet composes of water shielded by an immiscible …
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Wall Heat Transfer Coefficient in a Molten Salt Bubble Column
The Council for Scientific and Industrial Research (CSIR) is developing a novel process to produce titanium metal at a lower cost than the current Kroll process used commercially. The technology initiated by the CSIR will benefit South Africa in achieving the long-term goal of establishing a …
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Improved Desiccant Coatings for Heat and Water Vapour Transfer on the Matrix Surfaces of Air-To-Air Regenerative Wheels
… recovery wheels are now widely used in industry and buildings; however, the effectiveness of water vapor exchange in these regenerative wheels appears to be much lower than may be economically feasible. The purpose of this research is to investigate the feasibility of using agglomerated desiccant …
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Nonequilibrium phase Behaviour and Mass Transfer of Alkane Solvents(s)-CO2-Heavy Oil Systems Under Reservoir Conditions
… recovery factor, a remarkably low gas-oil ratio, and a higher-than-expected well production rate due mainly to the foamy nature of viscous oil containing gas bubbles. Even for secondary and tertiary recovery techniques, it is possible to artificially induce foamy oil flow in heavy oil reservoirs …
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