Heat Transfer Characteristic of Slit Nozzle Impingement on High-temperature Plate Surface

DOI Web Site 2 Citations 33 References
  • Wang Bingxing
    The State Key Laboratory of Rolling and Automation, Northeastern University
  • Liu Zhixue
    The State Key Laboratory of Rolling and Automation, Northeastern University
  • Zhang Bo
    The State Key Laboratory of Rolling and Automation, Northeastern University
  • Wang Zhaodong
    The State Key Laboratory of Rolling and Automation, Northeastern University
  • Wang Guodong
    The State Key Laboratory of Rolling and Automation, Northeastern University

Bibliographic Information

Published
2019-05-15
DOI
  • 10.2355/isijinternational.isijint-2018-576
Publisher
The Iron and Steel Institute of Japan

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Description

<p>Heat transfer mechanism of a slit jet impingement was thoroughly studied to improve capacity and uniformity of a hot steel strip/plate during its ultrafast cooling or quenching. The impact angle has a significant influence on the heat transfer characteristics of the stationary slit jet impinging process. Heat transfer capability and rewetting front propagation, which include such parameters as qmax, tMHF, and TMHF, differ significantly between the upstream and downstream regions. Parallel flow and intense sputtering in the downstream region are apparent for the forward-moving inclined slit jet impingement cooling process. The antiparallel flow in the upstream region is thinner, and the sputtering is reduced and is relatively stable. As the plate moves forward, the wetting front expands and forms almost a straight line with synchronized and uniform heat transfer. The inclined angle increases from 0 to 45°, which significantly increases the heat transfer intensity and shortens the time to nucleate boiling stage as well as the width of the transitional boiling region. A higher moving velocity reduces and promotes qmax moving to the downstream region.</p>

Journal

  • ISIJ International

    ISIJ International 59 (5), 900-907, 2019-05-15

    The Iron and Steel Institute of Japan

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