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 81 for “"Heat Transfer, Combustion"”.
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Supercritical Carbon Dioxide Extraction
<p>The objective of this thesis is to explore the properties of supercritical carbon dioxide (CO<sub>2</sub>). In addition, the feasibility of building a small-scale low cost system will be explained. A supercritical fluid is a fluid which exhibits properties between liquid and gas with liquid like …
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Effect of particles on evaporation of droplet containing particles
… to the needs for nanofluids for applications in heat transfer, combustion, and manufacturing desired micro/nano particles in the pharmaceutical industry. The evaporation of droplets containing particles involves complicated multiphase heat and mass transport. The evaporation process consists of …
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CFD Modeling and Simulation of Natural Circulation in Helium- Cooled Very High Temperature Reactors
… and four downcomer tubes, each equipped with heating coils, thermocouples, and pressure sensors. Natural circulation is driven by density gradients induced by asymmetric heating of the riser and downcomer tubes, simulating decay heat removal during LOFC scenarios. To measure gas velocity and …
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Unsteady flamelet progress variable modeling of reacting diesel jets
… then stabilization. The UFPV model assumes that combustion occurs in thin zones known as flamelets and turbulent strain characterized by the scalar dissipation rate modifies the flame structure. Since the flamelet is thinner than the smallest grid size employed in RANS or LES, the effect of the …
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Inverse Volume-of-Fluid Meshless Method for Efficient Non-Destructive Thermographic Evaluation
… efficiently solving transient multi-dimensional heat conduction problems in composite and heterogeneous media is formulated and implemented. While the LRC Meshless method lends its inherent advantages of spectral convergence and ease of automation, the VoF scheme allows to effectively and …
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Oscillatory Flow Mechanism for Enhanced Heat Transfer
… use of an oscillatory flow mechanism to enhance heat transfer. The idea behind this is to induce oscillation of the end wall of one of two connected chambers of a heat exchanger which effectively will induce oscillation of the boundary layer within the connecting duct. The main idea of this …
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A Comprehensive Numerical Investigation of Heat Transfer Dynamics in Supercritical Carbon Dioxide Cooling
… carbon dioxide (sCO<sub>2</sub>) is an ideal heat transfer medium in energy and industrial applications due to its exceptional thermophysical properties near its critical point. However, experimental studies and numerical modeling of sCO<sub>2</sub> face significant challenges, such as …
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Increasing Isentropic Efficiency with Hydrostatic Head and Venturi Ejection in a Rankine Power Cycle
… steam turbine experiment. While the use of superheating or reheating is commonly used to increase efficiency in a Rankine cycle the methods prove unfeasible in a small scale project. For this reason, a mathematical model and proof of concept design using hydrostatic head generated by elevation …
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Investigation of Shroud Geometry to Passively Improve Heat Transfer in a Solar Thermal Storage Tank
… configuration is used to passively increase heat transfer in a thermal store. The shroud and baffle are used to create a vena contracta near the surface of the heat exchanger, which will speed up the flow locally and thereby increasing heat transfer. The goal of this study is to investigate …
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An Experimental Study of Formation of Circulation Patterns in Laminar Unsteady Driven Cavity Flows Using Particle Image Velocimeter (PIV) Techniques
<p>Abstract</p> <p><strong> </strong>An experimental study is conducted to determine the velocity fields, from development to steady state, in a square enclosure due to movement of a constant velocity lid using Particle Image Velocitmetry (PIV). Experiments were conducted with water, seeded with …
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Finite-Difference Modeling of the Batch Process Smoldering Combustion of Wastewater
… MATLAB model was developed for the smoldering combustion of wastewater in the context of a decentralized residential wastewater treatment appliance. Data from a batch process sewage smoldering experiment was simulated using implicit finite-difference approximations, assuming one-dimensional …
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The Effect of Orientation on the Ignition of Solids
… an inherently complex phenomenon influenced by heat and mass transport mechanisms that are, even to this day, not understood in entirety. In order to use ignition data in meaningful engineering application, significant simplifications have been made to the theory of ignition. The most common way …
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Atmospheric Carbon Capture: A Review on Current Technologies and Analysis of Energy Consumption for Various Direct Air Capture (DAC) Systems
<p>Carbon dioxide (CO<sub>2</sub>) capture is a crucial approach to reducing greenhouse gases in the atmosphere to directly combat climate change. Major components of the technology to desublimate CO<sub>2</sub> at cryogenic temperatures are mature and have the potential to be applied to build …
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Atmospheric Water Harvesting: An Experimental Study of Viability and the Influence of Surface Geometry, Orientation, and Drainage
<p>Fresh water collection techniques have gained significant attention due to global dwindling of fresh water resources and recent scares such as the 2011-2017 California drought. This project explores the economic viability of actively harvesting water from fog, and techniques to maximize water …
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