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You searched for subject:(30 flow). Showing records 1 – 2 of 2 total matches.

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University of Tasmania

1. Mitchell Ferguson, TG. An experimental investigation into WEC operation in realistic sea states using PIV.

Degree: 2016, University of Tasmania

The focus of this study is on two key aspects of model scale experimentation when investigating the operation of ocean wave energy converters: the type of wave in which the device is exposed to; and the presence of three dimensional effects within and around the device. Scale model experiments were performed on an oscillating water column (OWC) in different conditions utilising particle image velocimetry (PIV). PIV is an advanced experimental technique which captures full velocity fields without interference with the flow and can be used to provide both qualitative and quantitative flow visualisation. To investigate the impact of wave type on the operation of an OWC, experiments were performed in three wave types: regular, polychromatic and irregular waves. While regular and irregular waves are often used, polychromatic waves offer an intermediate option which has properties of both. When investigating polychromatic waves phase averaging was shown to be a useful tool to generate averaged results for both PIV velocity fields and other more conventional data sources with a reduction in uncertainty. It was seen that testing in regular waves results in unrealistic harmonic effects which impact on device performance, in particular the formation and size of vortices. For experiments in irregular waves, a linear relationship was identified between the energy within vortices and the total energy within the velocity field. Identifying the presence of three dimensional effects was achieved by capturing two dimensional (2D) flow velocities at four transverse planes. This showed the transition between inflow and outflow conditions occurs at different times across the device. Velocity field divergence was calculated and large vortices were identified at the inside lip of the sidewall during inflow. It also indicated the device utilises the volume outside of its sidewalls during outflow, allowing an effective width greater than the extents of its sidewalls. This results in the potential for more power to be generated during outflow than inflow. This study has revealed the importance of performing experiments in realistic sea states and has highlighted the value of experiments in polychromatic and/or irregular waves early in the design process. The use of PIV provided a vast amount of information on the operation and performance of wave energy converters and should be strongly considered when performing quantitative flow visualisation, comparative studies and validation of numerical models.

Subjects/Keywords: wave energy converter (wec); particle image velocimetry (piv); oscillating water column (owc); model scale experiments; polychromatic waves; irregular waves; 30 flow; phase averaging

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Mitchell Ferguson, T. (2016). An experimental investigation into WEC operation in realistic sea states using PIV. (Thesis). University of Tasmania. Retrieved from https://eprints.utas.edu.au/23470/7/Mitchell_Ferguson_whole_thesis_ex_pub_mat.pdf ; https://eprints.utas.edu.au/23470/1/Mitchell_Ferguson_whole_thesis.pdf

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Mitchell Ferguson, TG. “An experimental investigation into WEC operation in realistic sea states using PIV.” 2016. Thesis, University of Tasmania. Accessed July 14, 2020. https://eprints.utas.edu.au/23470/7/Mitchell_Ferguson_whole_thesis_ex_pub_mat.pdf ; https://eprints.utas.edu.au/23470/1/Mitchell_Ferguson_whole_thesis.pdf.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Mitchell Ferguson, TG. “An experimental investigation into WEC operation in realistic sea states using PIV.” 2016. Web. 14 Jul 2020.

Vancouver:

Mitchell Ferguson T. An experimental investigation into WEC operation in realistic sea states using PIV. [Internet] [Thesis]. University of Tasmania; 2016. [cited 2020 Jul 14]. Available from: https://eprints.utas.edu.au/23470/7/Mitchell_Ferguson_whole_thesis_ex_pub_mat.pdf ; https://eprints.utas.edu.au/23470/1/Mitchell_Ferguson_whole_thesis.pdf.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Mitchell Ferguson T. An experimental investigation into WEC operation in realistic sea states using PIV. [Thesis]. University of Tasmania; 2016. Available from: https://eprints.utas.edu.au/23470/7/Mitchell_Ferguson_whole_thesis_ex_pub_mat.pdf ; https://eprints.utas.edu.au/23470/1/Mitchell_Ferguson_whole_thesis.pdf

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation


Universitat Autònoma de Barcelona

2. González Martínez, Ana Citlalic. Social metabolism and patterns of material use Mexico, South-America and Spain.

Degree: 2008, Universitat Autònoma de Barcelona

This thesis is composed of three published articles and a submitted one. All share the same theoretical approach: social metabolism. By tracing all material flows into several economic systems by means of the Material Flows Accounting methodology (MFA), this thesis aims on the one hand at characterizing current metabolic profiles of different economies, identifying their main driving forces; on the other hand, it aims at providing empirical evidence on dematerialisation of the economies. The main conclusion is that in our globalised world, countries are becoming more dependent on international trade and that the role a country plays in the international markets strongly determines its pattern of material use. This dependency followed different trajectories. On the one hand, we identify countries such as Spain that benefited from this process as it increased welfare based in an intensive use of strategic natural resources coming from other economic systems such as fossil fuels. Nevertheless, the main driving force shaping the biophysical profile of this economy was the construction sector, an internal factor. On the other hand, we identify those countries that historically have relied on the extraction of natural resources such as Chile, Ecuador, Mexico and Peru although we can no longer talk about a uniform pattern of natural resource use in the region. In Ecuador, Chile and Peru, international trade was the main driving force for material use. Ecuador remains the typical example of an extractive economy whereas a diversification of exports away from bulk commodities towards products with more added value could be observed to a greater extent in Chile and incipiently in Peru. Chile can be regarded as a successful example of the staple theory of growth as its GDP increased considerably. Mexico is a special and contradictory case. Firstly, despite being an important oil exporter, it has achieved a diversification of production, moving towards technology-intensive products due to the assembly industries. Secondly, despite it has a great potential of biomass extraction, it is undergoing a substitution process of imported biomass for national biomass, in particular, basic crops for human consumption. Instead of international trade, population growth was the main driving force for biophysical growth in this economy. Thirdly, it was observed an increasing emphasis on the use of construction materials and fossil fuels in the whole economy whereas in the countryside, rural households still rely heavily on traditional biomass flows such as fuelwood to satisfy their energetic needs. A general conclusion is that neither absolute dematerialisation nor relative dematerialisation occurred in any of the analysed countries. Advisors/Committee Members: Universitat Autònoma de Barcelona. Institut de Ciència i Tecnologia Ambientals, [email protected] (authoremail), true (authoremailshow), Schandl, Heinz (director), Martínez Alier, Joan (director).

Subjects/Keywords: Material flow accounting; Resource use indicators; Material flows; Ciències Experimentals; 30

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

González Martínez, A. C. (2008). Social metabolism and patterns of material use Mexico, South-America and Spain. (Thesis). Universitat Autònoma de Barcelona. Retrieved from http://hdl.handle.net/10803/5812

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

González Martínez, Ana Citlalic. “Social metabolism and patterns of material use Mexico, South-America and Spain.” 2008. Thesis, Universitat Autònoma de Barcelona. Accessed July 14, 2020. http://hdl.handle.net/10803/5812.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

González Martínez, Ana Citlalic. “Social metabolism and patterns of material use Mexico, South-America and Spain.” 2008. Web. 14 Jul 2020.

Vancouver:

González Martínez AC. Social metabolism and patterns of material use Mexico, South-America and Spain. [Internet] [Thesis]. Universitat Autònoma de Barcelona; 2008. [cited 2020 Jul 14]. Available from: http://hdl.handle.net/10803/5812.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

González Martínez AC. Social metabolism and patterns of material use Mexico, South-America and Spain. [Thesis]. Universitat Autònoma de Barcelona; 2008. Available from: http://hdl.handle.net/10803/5812

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

.