rdf-syntax-grammar
mods:
  schema location: http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
  title info:
    non sort: An
    title: investigation of liquid coating via the contact spreading mechanism in tumbling drum and fluidised bed coating processes
  name:
    name part: Norzaida Yusof
    role:
      role term: creator
    role:
      role term: author
  name:
    name part: University of Sheffield
  type of resource: text
  origin info:
    place:
      place term: my
    issuance: monographic
  language:
    language term: eng
  physical description:
    form: print
    extent: xxx, 300 leaves: illustrations (some color); 30 cm.
  abstract: The spray coating of particles is used in many industrial applications. One of the mechanisms involves the transfer of liquid between particles via liquid bridge formation and rupture; known as contact spreading. To date, there has been limited research into this mechanism. Indeed, the few studies reported have only been theoretical or modelling­based. In this thesis, a first experimental approach focusing on the liquid contact spreading mechanism is presented. Experimental data has been used to describe and quantify this mechanism, and this work will contribute to the design and scale-up of coating processes. Two coating techniques, commonly used in industry, have been employed for this study; tumbling drum and fluidised bed. Experiments were conducted using model materials; spherical alumina particles and aqueous polymer solutions as the coating liquids with varying viscosities. For these studies, specially designed experiments were conducted to study the contact spreading mechanism only. Of particular importance was the degree of coating uniformity within a batch of particles, quantified by the inter-particle coating variability (Co V). A new image analysis system, based on colorimetric measurement, has been developed to quantitatively determine the colour uniformity of particles coated with dyed solutions. Here, it is demonstrated that this novel method can analyse a large number of particles in a relatively small period of time and gives reproducible data with which to determine the Co V of a batch. Contact spreading was seen to occur in all systems studied. This supports the concept that contact spreading plays an important role in the spray coating process. Indeed, in the both tumbling drum and the fluidised bed system under certain conditions, a near-uniform coating was ultimately achieved. The rate of contact spreading and, therefore, the time to complete the coating process, was highly dependent on both formulation and operational parameters. For example, …
  table of contents: 1. Introduction -- 2. Literature review -- 3. Materials and method -- 4. Development of a quantitative colorimetric method for coating characterisation -- 5. Investigation of the contact spreading mechanism for particle coating in tumbling drums -- 6. Investigation of the contact spreading mechanism for particle coating in small-scale fluidised bed -- 7.Contact spreading in a fluidised bed: isolating the contact spreading mechanism -- 8. Theoretical contact spreading mechanism from experimental observations -- 9. Conclusions and recommendations
  note: Norzaida Yusof.
  note: Thesis (Degree of Doctor of Philosophy) - University of Sheffield, 2019
  subject:
    name:
      name part: University of Sheffield --
    topic: Dissertations
  subject:
    topic: Coating processes
  subject:
    geographic: Malaysia
  classification: TP156
  record info:
    record content source: UniSZA
    record creation date: 190717
    record change date: 20191212090000.0
    record identifier: 0000096509