×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

K coefecient of nozzles

K coefecient of nozzles

K coefecient of nozzles

(OP)
Hi

do anyone know what is the K value of discharge nozzles of wash down lines and fire hose reels?

RE: K coefecient of nozzles

According to the Crane "Flow of fluids" book,
K2=(1-beta^2)*0.8* sin (theta/2)/(Beta^4)

Beta = area of outlet /Area of inlet
Theta is the cone angle as the nozzle reduces.

in my 1988 version of the book it is on page 52.  

RE: K coefecient of nozzles

(OP)
thks JimCasey

what velocity is used to detemine the pressure loss; inlet or outlet velocity?

RE: K coefecient of nozzles

JimCasey,
Note that CRANE defines
beta = d1/d2
d1 = smaller diameter
d2 = larger diameter

beta is defined in page 2-11 Title: contraction and enlargement

mechanicaldup... in the Flow of Fluids Technical paper subindex 1 always refers to the smaller diameter and subindex 2 to the larger diameter...

so, K2 is referring to the larger diameter.
In case of a tapered contraction (your discharge nozzle), K2 refers then to the INLET (larger diameter).

the relationship between K1 and K2 is:
K2 = K1/beta^4



saludos.
a.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources