Re: 10d, 5d, T-Bends For Pe Dilute Phase Conveying
Due to the very low density of PE pellets the pressure drop produced by them during lean phase conveying is very low. A number of researchers have looked into the pressure drop Vs bend radius and most of them have found that there is no significant difference. But this is only valid for low density materials. Actually for PE pellets it is better to use blind tee's or elbows as they reduce angel hair. But if you test a high density material there is a significant difference between R/d 5 and 10 bend pressure drops.
As far as the mechanism of bend pressure drop is concerned in simple terms you are right particle velocity gets reduced in the bend and then they are re-accelerated down stream of the bend in the acceleration length. So the bulk of the pressure loss is after the bend. ■
Re: 10d, 5d, T-Bends For Pe Dilute Phase Conveying
Dear Mantoo,
I got it!
Thanks! ■
Shenjie Tel:+86(0)20 83553890,83550361 Fax: +86(0)20 83542314 [email]sj@chinabulk.com[/email] [url=http://www.chinabulk.com]Sino-Auto Technology[/url]
10D, 5D, T-Bends for PE dilute phase conveying
Normally we use 10D bends for a lowest pressure drop. But for PE 10D bends will cause streamer. So 5D, T-bends or gamma bens are applied.
Some tested pressure drops for 10D, 5D, T-bends and found their pressure drops are similar.
I think it can be explained in this way:
Pressure drop across 5D, T-bends may not be so much higher than 10D but they reduce pellet velocity. pellet will be accelerated again in downstream pipes, this raises the system pressure drop.
Am I right? ■
Shenjie Tel:+86(0)20 83553890,83550361 Fax: +86(0)20 83542314 [email]sj@chinabulk.com[/email] [url=http://www.chinabulk.com]Sino-Auto Technology[/url]