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Licensed Unlicensed Requires Authentication Published by De Gruyter June 3, 2022

Computational study of subcooled water injection into steam line: effect of Reynolds number on flow transition to study condensation induced water hammers

Abdul Quddus ORCID logo, Ajmal Shah, Kamran Rasheed Qureshi, Muhammad Khawar Ayub, Mazhar Iqbal and Abdus Samee
From the journal Kerntechnik

Abstract

The direct contact condensation (DCC) of steam in subcooled water encounters in wide range of the industrial applications. On one side, it is an efficient and rapid, mass and heat transfer phenomenon. But, on the other side, it may generate condensation induced water hammers (CIWH) events which may cause high pressure peaks resulting in severe damage to the mechanical systems. This computational study intends to explore the underlying physics of CIWH events while injecting subcooled water into steam filled horizontal pipe section. The Reynolds number is varied from, Re w  = 60,750 to 646,900, to study the flow regimes (stratified and slug), onset of CIWH and local flooding conditions. The results have been compared with the published data and found in good agreement. It has been observed that for Re w  = 182,300, flow remains stratified. However, the flow regime changes from stratified to slug flow at Re w  = 303,850–646,900, possibly due to the onset of CIWH. Extensive steam pockets have been observed at Re w  = 303,850, which may be considered as onset of CIWH. Local flooding condition is also started at Re w  = 303,850 and is observed to be shifted upstream with the increase in Reynolds number. This study is considered to be useful for the safe design and economical operation of the relevant systems in nuclear and other related industry.


Corresponding author: Abdul Quddus, Department of Mechanical Engineering, Pakistan Institute of Engineering and Applied Sciences, PIEAS, Islamabad, Pakistan, E-mail:

Funding source: Higher Education Commission, Pakistan.

Award Identifier / Grant number: HEC indigenous PhD fellowship scheme (417-47877-2EG4-042)

  1. Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.

  2. Research funding: This present work was financially benefited from Higher Education Commission, Govt. of Pakistan against HEC indigenous PhD fellowship scheme (417-47877-2EG4-042). The authors acknowledge the supports.

  3. Conflict of interest statement: The authors declare no conflicts of interest regarding this article.

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Received: 2021-12-02
Revised: 2022-05-10
Published Online: 2022-06-03
Published in Print: 2022-08-26

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