Channel flow

- July 28, 2021 at 7:51 am
  
  Abubakar
  Subscriber
  
  Hi Sir,
  Can anyone please tell me the friction factor formula for 2D channel flow? TIA
  
  Thank you,
  Abubakar
- July 28, 2021 at 7:54 am
  
  aitor.amatriain
  Subscriber
  
  For laminar flow (Re<2000), friction coefficient lambda=64/Re. For turbulent flow (Re>400), there are many correlations available. Wikipedia gives a decent recopilation of all of them:
  Darcy friction factor formulae - Wikipedia
- July 28, 2021 at 10:26 am
  
  Abubakar
  Subscriber
  
  Thank you sir, but what will be the hydraulic diameter for 2d channel flow?
- July 28, 2021 at 10:31 am
  
  aitor.amatriain
  Subscriber
  
  The height of the channel
- July 28, 2021 at 10:54 am
  
  Abubakar
  Subscriber
  
  thank you
- July 29, 2021 at 2:25 pm
  
  Abubakar
  Subscriber
  
  In the book, it's showing the difference. PFA
  
  Reference: Fluid Mechanics by Yunus cengel