CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > ANSYS > FLUENT > Fluent Multiphase

Suspension velocity & pressure drop in slurry flow analysis

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   July 16, 2020, 00:28
Default Suspension velocity & pressure drop in slurry flow analysis
  #1
Member
 
Ravi Agrawal
Join Date: Dec 2012
Posts: 40
Rep Power: 13
abc197 is on a distinguished road
Dear all. I am working on slurry flow (Water+sand) modelling in Ansys Fluent in a 3D horizontal pipe. Solid volume fraction is 20%. I ma interested to find out the suspension velocity of fluid in this case. That is the point where all sand particles are flowing with the water and none of particles are settled at bottom. In starting with Eulerian 2 phase granular model, . My issues are
(1) How do I verify in Fluent that suspension velocity has been achieved. Is it by looking at sand velocity profile or solid fraction profile throughout the pipe or something else. Can we track the sand particles path in result. So we know the moment it is suspended in water. Basically how do we know sand floating in water and what velocity.
(2) Is it true that we have to patch sand volume initially to bottom region of pipe. Is patch at all mandatory, because what if sand and water entering uniformly at the inlet. or what of Initially there is no sand in pipe. Can we get result without patching.
(3) I used tried with turbulence k-e realizable and RNG model without patching. I am getting same velocity distribution throughout the pipe for sand and water for staedy state case. Also solid vol fraction at any cross-section remains same throughout pipe. Bulk of sand at bottom. Which cant be right.
(4) In results, in some regions, solid vol. fraction found exceeding the input asigned value.

Any help is much appreciated.
with best regards
abc197 is offline   Reply With Quote

Old   July 19, 2020, 06:17
Default
  #2
Member
 
Ravi Agrawal
Join Date: Dec 2012
Posts: 40
Rep Power: 13
abc197 is on a distinguished road
After performing for steady state, without patching as sand enters with water. It is a 2.5 m long pipe with pipe dia of 25 mm. Eulerian-granular, 2-fluid phases (one granular phase) is used with k-epsilon turbulence.

I am getting sand vol. fractions and sand velocity profiles as shown. In first row, sand vol fraction contours are shown for inlet, middle and outlet of pipe. In second row, sand velocity contours are shown for inlet, middle and outlet of pipe. Expectation is to see the sand cluster to move to come to upside in cross-section as it moves along with water. I cant see that as of now. Not sure where the problem could be.

I appreciate any suggestions regarding improving.
Attached Images
File Type: jpg Mesh.jpg (103.1 KB, 3 views)
File Type: jpg SandVol.Fraction-&_SandVelocity.jpg (83.8 KB, 3 views)
abc197 is offline   Reply With Quote

Old   August 16, 2020, 07:21
Default CFD Modeling of Slurry Flow
  #3
New Member
 
Dr.Sharad Pachpute
Join Date: Aug 2010
Location: Pune, India
Posts: 9
Blog Entries: 1
Rep Power: 16
pachputesharad is on a distinguished road
CFD Modeling of slurry flows involves selection of correct viscosity model, turbulence and multi-phase models with correct boundary conditions;
Refer this article;

https://cfdflowengineering.com/slurr...cfd-modelling/
pachputesharad is offline   Reply With Quote

Reply

Tags
ansys, fluent, slurry flow

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Wind tunnel Boundary Conditions in Fluent metmet FLUENT 6 October 30, 2019 13:23
Match Pressure Inlet/Outlet Boundary Condition Mass Flow Rate MSchneid Fluent UDF and Scheme Programming 3 February 23, 2019 07:00
kindly help me .. i have and error at line number 147.. m zubair Fluent UDF and Scheme Programming 0 February 10, 2019 12:25
Channel flow: Inlet pressure AND uniform velocity? frmap1 Main CFD Forum 0 April 15, 2010 11:32
flow simulation across a small fan jane luo Main CFD Forum 15 April 12, 2004 18:49


All times are GMT -4. The time now is 02:52.