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 “"Tube diameter"”.
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Boiling Heat Transfer of Freon-113 Flowing Normal to a Tube: Effect of Tube Diameter
The effect of heater diameter on the pool and flow boiling heat transfer of saturated Freon-113 was examined. The heaters were horizontal copper tubes of diameter 1.59 to 7.94 mm (pool) and 3.18 to 12.7 mm (flow), heated internally by condensing steam. The test fluid, at atmospheric pressure, …
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Flow patterns in upward two-phase flow in small diameter tubes
Two-phase flow in small tubes and channels is becoming a common phenomenon in industrial processes. However, the study of two-phase flow regimes in small tubes is still at its infancy. The previous studies are reviewed and discussed in the literature section. The problems and inconsistencies …
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Experimental Investigation of Liquid and Particle -Laden Flows in Microtubes
… regimes defined by the ratio of particle diameter to tube diameter. For example, for 0.33 D < dp < 0.46D, a shear-induced arching mechanism has been observed, similar to the arching phenomenon common to granular flows. Orthokinetic flocculation occurs when shear-induced particle collisions …
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Optical and Thermal Analysis of a Heteroconical Tubular Cavity Solar Receiver
… and optimisation focused on the absorber tubes of the Heteroconical receiver. This enabled further investigation into the effect of tube diameter on the total performance of the Heteroconical receiver and led to an optimal inner tube diameter for the receiver under given operating …
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Measurement and control of brake pedal feel quality in automobile manufacturing
… on the brake system cross-sectional area (i.e. tube diameter) and not on the vacuum pressure. Organizational process issues were analyzed, and we found that greater cross-functional communication and collaboration are needed between manufacturing and external groups such as design and marketing.
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Axial load capacity of circular steel tube columns filled with high strength concrete
… load capacity of circular Concrete Filled Steel Tube columns using High Strength Concrete (CFST-HSC). Emphasis is drawn to the enhanced axial capacity of short columns attributed to the lateral confinement of the concrete infill provided by the steel encasement. The degree of confinement has been …
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Thermal management of the copper-chlorine cycle for hydrogen production: analytical and experimental investigation of heat recovery from molten salt
… of hydrogen production on the heat exchanger diameter was also shown. For a hydrogen production rate of 1000 kg/day, the diameter of the heat exchanger is about 3 m for a droplet size of 1 mm and 2.2 m for a droplet size of 2 mm. The results for axial growth of the solid layer and variations …
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Evaluations of single walled carbon nanotubes using resonance Raman spectroscopy
… properties of single walled carbon nanotubes (SWNTs). In the first study, we report an evaluation of second-order combination and over-tone modes in highly ordered pyrolytic graphite (HOPG), in SWNT bundles, and in isolated SWNTs. We found both dispersive and non-dispersive Raman bands …
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Strain-induced self-rolled-up semiconductor micro/nanotubes: Fabrication and characterization
Strain-induced self-rolled-up semiconductor nanotubes are a new type of building block for three-dimensional architectures. Semiconductor nanotubes (SNTs) take advantage of the lattice mismatch between different layers and are formed when the strained semiconductor layers are released from the …
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Role of internal heat exchanger in air conditioning systems
… the influence of geometrical effect such as tube diameter, fin features…etc. that will affect heat transfer and pressure drop performance. Moreover, weight penalty of each design upon application were also stressed. Another objective of this research is to develop component model of each IHX …
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The rheology and flow behaviour of high concentration mineral slurries
… are investigated using a modified Balance Beam Tube Viscometer. The viscometer is capable of producing reliable data using a computer based data acquisition system and three different tube diameters. The aim of this research is to determine the rheology of backfill tailings in order to predict …
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Heat, Charge and Spin Transport of Thin Film Nanostructures
… of doped semiconducting single-walled carbon nanotube thin films. We use the Wiedemann-Franz law to calculate contributions to thermal conductivity and find interesting underlying physics as we dope the films, thus changing the Fermi level. Adapting the tube diameter leads to structural …
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Microparticle Influenced Electroosmotic Flow
… and particle type was conducted using microtube inner diameters of 100 – 300 micrometers. It was found that the effective electroosmotic mobility decreases with increasing microtube diameter. A numerical study of microparticle influenced electroosmotic flow was also conducted for positively …
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Single-Chamber solid oxide fuel cells: modelling and experiments
… in performance, e.g. cell positioning, micro-tube diameter and cathode morphology (its micro-structure and material) are important factors to consider. Other parameters such as, flow rate, temperature and mixing ratio are also very effective in improving the cell performance but these …
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Towards a fullerene-based nanotechnology: The (10,10) tube
… in the form of single-wall fullerene nanotubes (SWNTs) in the presence of certain transition metal SWNT catalysts. Due to the high carbon to metal ratio in the vapor will the early stages of condensation, even in the presence of a SWNT catalyst, be characterized by an abundance of …
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Oscillatory Flow Mechanism for Enhanced Heat Transfer
… wall on one of the chambers, and a connecting tube. Several cases are carried out reporting on heat transfer enhancement as a function of the tidal displacement to connecting tube diameter. Unlike previous studies which were undertaken using asymptotic analysis, the present models and results …
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The development of methods for the determination of selenium using spectrofluorimetric and ICP-MS techniques.
… to Se (IV) before detection. Variables such as tube diameter, flow rates, type of acids (HNO[3], H[2]SO[4], CH[3]COOH, H[3]PO[4] and HCI) that affect the rate at which PTQA reacted with Se (IV) were investigated and optimised. The linear calibration range was found to depend on the type and …
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Oscillatory Flow As A Means Of Enhanced Species Separation: A Three Dimensional Time-accurate Cfd Analysis
… an oscillating piston wall, and a connecting tube. Several cases are carried out reporting on separation enhancement as a function of the Womersley number and the ratio of tidal displacement to connecting tube diameter. Unlike previous studies which were undertaken using asymptotic analysis, …
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Development and validation of a thermodynamic model for predicting mode transitions in falling film flows over horizontal tubes
Horizontal-tube, falling-film heat and mass exchangers are important to many industries, with example applications in thermal desalination, vapor compression machines, absorption chillers, and natural gas liquefaction. Falling-film heat and mass exchangers are attractive for these applications …
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The application of dimensional and statistical analysis to fluidization studies
… sand with the variables of bed height, bed diameter, and particle size by dimensional and statistical means. In the investigation, the effects of bed height, particle size, and vessel diameter on the pressure drop through the fluidized system were studied. Copper fluidization columns were …
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