I have enclosed a image file which defines the flow conditions of a pipe. i have one doubt whether flow is compressible or incomprehensible??? how to write continuity equation (differential) for steady state conditions???

# Is flow is compressible or incompressible??

- 63 Views
- Last Post 19 September 2018
- Topic Is Solved

If you do the calculations what is the difference in density? Then compare the difference with the overall density. You may also need to factor in the flow rate, what is that?

Hello,

Just to add to rwoolhou's answer, you should be able to get the continuity equation for this problem in any standard fluids and heat transfer textbook. Just search for internal flow and heat transfer through a pipe with constant wall flux.

Best,

Karthik

Hi,

As a first approach I would assume the flow to be incompressible. You can assess this a priori by calculating the Mach number of the flow based on the speed of sound in the water. For Mach < 0.3 assuming incompressibility is a good approximation (without buoyancy effects).

I assume the water is liquid. Please find out the water density at inlet and outlet respectively. If the density change is over 5%, the water is compressible. Otherwise it is incompressible.

##### Search

##### Change Language

##### Categories

##### This Weeks High Earners

- peteroznewman 68
- abenhadj 63
- jj77 38
- FrankD 26
- Georgiro 25
- jcallery 24
- vamsikrishnachowduru 20
- raul.raghav 19
- vganore 18
- Peter Serano 18

##### Hot Topics

- 1 Hi, I have a problem to install the license and see my problem, I am sure you can help me. Thanks
- 2 Could not connect to license server: 54529@localhost The handle is invalid. .
- 3 Problem with the Student Version
- 4 Convergence of adaptive mesh refinement tool
- 5 Structural-Thermal analysis error : element type