Thermodynamics and Fluid Mechanics Thermodynamics and Fluid Mechanics Physics Help Forum

Jan 17th 2016, 10:55 AM   #1
Junior Member

Join Date: Jan 2016
Posts: 3

Dear All.
First of all good evening , happy new year .
I have an issue related mainly to the fluid dynamic. The attached file explains in details the issue . I hope I can get a help or a hint regarding the presented issue.
Attached Files
 Problem Discription1.doc (273.0 KB, 5 views)

 Jan 17th 2016, 01:35 PM #2 Senior Member   Join Date: Apr 2015 Location: Somerset, England Posts: 1,035 This is not a simple situation or one where there will be a simple analytic solution. Significant viscous and surface forces will be acting in any material as thick as a slurry. Further the viscoscity will be velocity dependent. A finite element based solution is indicated here. You say that the material rises in the vertical tube and then exits to the side and flows down the near horizontal pipe, although you do not show that pipe to be full so pipe formulae are not applicable. But why does this happen? What forces the slurry out? If this were a relatively thin fluid, moving fast, then you could say it was centrifugal pump action. But here you have a thick slurry, moving slowly. The usual solution would be for the rotator to incorporate significant vanes to push the slurry sideways and into the pipe. Concrete pumps are positive displacement types, but run full bore in closed pipes. That system won't work running with an open topped vertical tube and partly filled oulet pipework.
 Jan 18th 2016, 12:55 AM #3 Junior Member   Join Date: Jan 2016 Posts: 3 Dear studiot. Thanks a lot for your reply ,, you are right the exit pipe is not full, the pump used is reciprocal pump, the flow rate varies between 200 up to 1200 GPM. In case the pipe at the middle does not rotate, will be an analytical solution for computing the fluid head ?