Experimental study on near wall transport characteristics of slug flow in a vertical pipe(PDF)

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• Date:2025-04-30
• Title of Paper:Experimental study on near wall transport characteristics of slug flow in a vertical pipe(PDF)
• Journal:Heat and Mass Transfer
• Summary:In this work, the wall shear stress and the masstransfer  coefficient  of  the  gas–liquid  two-phase  upwardslug flow in a vertical pipe are investigated experimentally,using  limiting  diffusion  current  probes  and  digital  high-speed video system. In experiments, the instantaneous and averaged  characteristics  of  wall  shear  stress  and  mass transfer coefficient are concerned. The experimental results are compared with the numerical results in previous paper of the authors. Both experiment and numerical simulation show that the superficial gas and liquid velocities have an obvious  influence  on  the  instantaneous  characteristics  of the two profiles. The mass transfer coefficient has charac-teristics similar to the wall shear stress. The instantaneous wall shear stress and mass transfer coefficient profiles have the periodicity of slug flow. The averaged wall shear stress and   mass   transfer   coefficient   increase   with   increased superficial gas velocity. However, there is inconsistency in the variation trends of the averaged wall shear stress and mass  transfer  coefficient  with  superficial  liquid  velocity between  experimental  result  and  numerical  simulation result,  which  can  be  attributed  to  the  difference  in  flow condition.  Moreover,  the  Taylor  bubble  length  is  also another impacting factor. The experimental and numerical results all shows that the product scale can not be damaged directly by the flow movement of slug flow. In fact, the alternative  forces  and  fluctuations  with  high  frequency acting on the pipe wall due to slug flow is the main cause for the slug flow enhanced CO 2 corrosion process.
• Co-author:K Yan, Y Zhang, D Che
• Volume:48
• Page Number:1193-1205
• Translation or Not:No
• Date of Publication:2012-01-15