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中南大学学报(英文版)

Journal of Central South University

Vol. 22    No. 7    July 2015

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Numerical analysis of heat transfer intensity from twin slot vertical jet impingement on strip surface after hot rolling
SHI Jian-hui(石建辉), YUAN Guo(袁国), JIANG Lian-yun(江连运), ZHAO Kun(赵昆), WANG Guo-dong(王国栋)

State Key Laboratory of Rolling and Automation (Northeastern University), Shenyang 110819, China

Abstract:The flow field and heat transfer of the strip surface due to the twin slot vertical jet impingement were investigated using the ANSYS FLUENT. The RNG k-ε model was carried out in the turbulent calculation. Systematic parametric research was conducted by varying the jet velocity of nozzle exit (V=5 m/s, 7.5 m/s, 10 m/s), the temperature of cooling water (Tw=280 K, 300 K), the normalized spacing from the nozzle to the strip surface (H=10, 15, 20, 33), and the normalized spacing from the nozzle to nozzle centerline (W=0, 15, 30). The velocity streamline of the flow domain and the general trend of the distribution of the local Nusselt number on the impingement surface of strip were obtained. The result indicate that, the average Nusselt number increases by about 70% (90%) as the jet velocity is increased from 5 m/s to 7.5 m/s (from 7.5 m/s to 10 m/s), and Tw , H and W have minimal effect on it. While the valley Nusselt number decreases by about 10%-43% with the increase of H and W. The functional relationship between the average Nusselt number and the systematic parameters is derived by the least square regression method.

 

Key words: ultra-fast cooling; heat transfer; flow field; twin slot nozzle; Nusselt number

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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