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- Imani Jajarmi, Ramin, 1987-
(författare)
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Acoustic separation of submicron particles in gaseous flows
- 2015
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Licentiatavhandling (övrigt vetenskapligt/konstnärligt)abstract
- The separation of submicron particles suspended in gaseous flows is a problem of great importance and is the subject of sustained research efforts. This is motivated by several challenges presented by modern science and technology requiring high separation efficiencies for submicron particles.Continuous acoustic particles separation is a novel technique based on the acoustophoresis phenomenon, in which a particle within an acoustic field is manipulated using acoustic forces on its surface. This technique has the potential to overcome some of the limitations of common techniques for the separation of submicron particles, as well as performing advanced tasks such as sorting particles according to their size or density.In this thesis, the separation of submicron solid particles suspended in air is investigated experimentally, with a focus on the effect of key design parameters (acoustic, flow, geometry) on the efficiency of the process. A simple method based on laser light scattering was also used to provide qualitative information on the particle number density as a function of position in the channel. This technique allowed to quickly investigate the effect of a wide range of parameters on the acoustic separation efficiency including the pressure amplitude, the frequency of the standing wave, the average flow velocity and the parallelism of the channel walls. The results demonstrate conclusively that acoustic manipulation is possible for submicron particles and that the acoustic force scales following the trends expected from theoretical models developed in the continuum regime. From the size of the particles used it however follows that the observed separation is the result of transition regime acoustophoresis, with a Knudsen number on the order of 0.2.
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| 2. |
- Löfgren, Martin
(författare)
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Packaging and Customer Value : A Service Perspective
- 2004
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Licentiatavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Already in the mid-seventies it was concluded that there are very few, if any, ‘pure’ goods or services. Nevertheless, over 20 years later, most publications on services focus on how service characteristics differ from goods. More recent research emphasizes that the present economy is, and will continue to be, service-dominated, but it also acknowledges that the offered good is an important part of the offer. It has also been suggested that the most important work in service research today applies both to the service sector and the goods sector. In this licentiate thesis an attempt is made to conduct research that applies to both these sectors by investigating packaging from a service perspective.The traditional role of packaging in consumer products has been to store and protect the content. Current consumer and industry trends, however, suggest an increasingly important role for packaging as a strategic tool as well as a marketing vehicle. Companies consequently need to develop, design, and provide packages with high customer-experienced quality. In this context it is important to recognize that customer value is something perceived by customers rather than objectively determined by companies.To study packaging from a service perspective is relevant for several reasons. One reason is that packaging is something that can have several functions, which include something more than the physical package. Another is that packages are carriers of information that is interpreted by customers. The combination of functions, information, the physical package, and its content creates the total customer experience.
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