Journal of Failure Analysis and Prevention

, Volume 16, Issue 3, pp 410–416 | Cite as

Evaluation of Erosion Corrosion in Liquid–Solid and Liquid–Gas via Experimental Analysis Inside 90° Copper Elbow

  • Mohamed Ahmed Fouad Mohamed Gaber
  • Taghreed Mohamed Zewail
  • Nieven Kamal Amine
Technical Article---Peer-Reviewed


Erosion–corrosion experiments of copper elbow were performed by acidified dichromate. Mass transfer coefficient inside 90° copper elbow has been investigated. The results showed that the mass transfer coefficient increases as solution velocity increases in both cases of one- and two-phase flow. The mass transfer coefficient can be related to the solution velocity in case one-phase flow by the following equations:
$$k \, \alpha \, v^{ 0. 4 4}\quad{\text{for\,Sc\,from\,678 to 845}}$$
$$k \, \alpha \, v^{ 0. 3}\quad{\text{for\,Sc\,from\,1040\,to\,1445}}$$
In case of liquid–solid flow
$$k \, \alpha \, v^{ 0. 3 3}$$
In case of liquid–gas flow
$$k \, \alpha \, vg^{ 0. 2 4}$$
The importance of these equations is to understand and predict erosion corrosion inside 90o copper elbow.


One-phase flow Two-phase flow Mass transfer coefficient Copper elbow Solution velocity 

List of Symbols


Active area of copper elbow (cm2)


Solution volume (cm3)


Initial dichromate ions concentration (mol/cm3)


Dichromate ions concentration in the system at time t (mol/cm3)


Mass transfer coefficient inside elbow (cm/s)


Solution velocity (cm/s)


Gas velocity (cm/s)

Dimensionless Group


Schmidt number \(\left( {\frac{\mu }{{\rho {\text{D}}}}} \right)\)


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Copyright information

© ASM International 2016

Authors and Affiliations

  • Mohamed Ahmed Fouad Mohamed Gaber
    • 1
  • Taghreed Mohamed Zewail
    • 1
  • Nieven Kamal Amine
    • 1
  1. 1.Chemical Engineering Department, Faculty of EngineeringAlexandria UniversityAlexandriaEgypt

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