×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Are you an
Engineering professional?
Join Eng-Tips Forums!
• Talk With Other Members
• Be Notified Of Responses
• Keyword Search
Favorite Forums
• Automated Signatures
• Best Of All, It's Free!

*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.

# CALCULATING PRESSURE DROP THRU AN INLET SCREEN2

## CALCULATING PRESSURE DROP THRU AN INLET SCREEN

(OP)
I WOULD APPRECIATE ANY HELP ON CALCULATING THE PRESSURE DROP THROUGH AN INLET SCREEN. THE SCREEN IS AT THE INLET OF A WATER TREATMENT PLANT.

### RE: CALCULATING PRESSURE DROP THRU AN INLET SCREEN

2
Chapter 8 in Idelchik (1986), "Handbook of Hydraulic Resistance", Hemisphere Publishing Corp. covers flow through barriers uniformly distributed over channel cross sections. Circular metal wire grids are treated in Diagram 8-6 on page 407. Perforated plates, grids, bars, grills, etc. are also treated.

### RE: CALCULATING PRESSURE DROP THRU AN INLET SCREEN

The equations for circular metal wire in Idelchik's diagram 8-6 are:
Loss Factor(LF)=delp/(rho*(w1^2/2))=1.3*(1-AR)+((1/AR)-1)^2
for Reynolds Number Re=(w0*d/nu)=>1000   where
d=wire diameter
w1= Velocity in duct upstream of screen
w0= Velocity through the open section of the screen
For Re values less than 1000, the Loss Factor is multiplied by a plotted Re-dependent value close to 1.0 from Re=1000 to 300 which rises to about 1.23 at Re=100 and to 1.4 at Re=50.
Idelchik gives different symbols for wire diameter, loss factor and area ratio. I've changed them to simplify the description.

#### 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.

#### Resources

Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a partâ€™s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

Close Box

# Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

• Talk To Other Members
• Notification Of Responses To Questions
• Favorite Forums One Click Access
• Keyword Search Of All Posts, And More...

Register now while it's still free!