A heat equation for freezing processes with phase change: stability analysis and applications

Christoph Josef Backi, Jan Dimon Bendtsen, John-Josef Leth, Jan Tommy Gravdahl

Research output: Contribution to journalJournal articleResearchpeer-review

6 Citations (Scopus)

Abstract

In this work, the stability properties as well as possible applications of a partial differential equation (PDE) with state-dependent parameters are investigated. Among other things, the PDE describes freezing of foodstuff, and is closely related to the (potential) Burgers’ equation. We show that for certain forms of coefficient functions, the PDE converges to a stationary solution given by (fixed) boundary conditions that make physical sense. These boundary conditions are either symmetric or asymmetric of Dirichlet type. Furthermore, we present an observer design based on the PDE model for estimation of inner-domain temperatures in block-frozen fish and for monitoring freezing time. We illustrate the results with numerical simulations.
Original languageEnglish
JournalInternational Journal of Control
Volume89
Issue number4
Pages (from-to)833-849
ISSN0020-7179
DOIs
Publication statusPublished - 2016

Keywords

  • Distributed parameter systems
  • Stability Analysis
  • Observer Design
  • Freezing

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