Charakterisierung und Optimierung von Rund- und Schlitzdüsensystemen beim Einsatz in Jetkühlern von Kontiglühlinien

Translated title of the contribution: Characterization and optimization of round nozzle- and slot nozzle systems used in jetcoolers of continuous annealing lines

Matthias Brenninger

Research output: ThesisMaster's Thesis

Abstract

During the heat treatment of rolled sheet metal, it is often necessary to quench the material. Besides the conventional technologies such as oilbath- or metalbath-quenching, the eco-friendlier gasflow-quenching has become popular. The main advantages of this latter technology are the perfect surface qualities, the flexibility (especially in multi-product plants) and its eco-friendliness. Within this thesis, the behaviors of two special nozzle systems for gasjet-coolers were analyzed. One design was based on an array of round jet nozzles, the other one was a special development of a slot-nozzle array which should guarantee low pre-cooling while entering the jetcooler. Parameters such as the nozzle stripe distance, the nozzle exit velocity or the inert gas-mixture (Hydrogen / Nitrogen) influence on the cooling characteristics were studied on an industrial scale device. Besides these experimental studies, theoretical and computational tools including CFD-Analysis and similarity models were used and validated. A special goal of the CFD-Analysis was to become a better understanding of the cooling characteristics of the round-nozzle-array. A benchmark of the different arrays should assist design engineers while choosing nozzle geometries for special applications.
Translated title of the contributionCharacterization and optimization of round nozzle- and slot nozzle systems used in jetcoolers of continuous annealing lines
Original languageGerman
QualificationDipl.-Ing.
Supervisors/Advisors
  • Raupenstrauch, Harald, Supervisor (internal)
  • Seemann, Peter, Supervisor (external), External person
Award date28 Jun 2013
Publication statusPublished - 2013

Bibliographical note

embargoed until 14-05-2018

Keywords

  • continuous annealing
  • jetcooler
  • round nozzle
  • slot nozzle

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