[fahimeh456]

I would like to draw a diagram with mass flow rate fraction according to Channel height inside cfx.but I do not know, how I can draw it?

[ghorrocks]

What is mass flow rate fraction?

[fahimeh456]

Reductions mass flow along the channel.
I don't know how I can define that in the cfx?

[ghorrocks]

Why is the mass flow rate reducing along the flow?

This plot is obviously showing something of importance to the thing it is modelling - but without knowing what is being modelled it makes no sense at all. So please explain what you are modelling and why this plot is important. When we know what the plot means we might be able to help you.

[fahimeh456]

In this model, the effect of the numerical model, mass flow rate and inlet boundary conditions on the flow and temperature distributions in a disc-type transformer winding is investigated using a commercial CFDcode.
This model is a rectangular channel with one inlet and outlet that there are some disc inside the channel.every disc is heat source and velocity change along the channel for some reason.
But I do not see that what this graph is plotted.When I define a line along the channel and define mass flow as follows:
mass flow=density*area*velocity
Then area equals with Zero and mass flow equals with Zero.

[fahimeh456]

A view of the channel is as follows:

[ghorrocks]

Don't calculate mass flow rate yourself. Use the massflow() function. You will need to define a surface to calculate the mass flow rate over.

You have not answered the basic question: What is making the mass flow rate change along the path? It appears there is some form of bypass piping. Is this correct? What controls the amount of flow which takes the bypass pipe?

[fahimeh456]

Density change along the channel for temperature changes then
the amount of velocity change after that the mass flow change.
What can I inter inside Parenthesis of the mass flow() function?
what surface can I define ?

[ghorrocks]

If the temperature increase results in a density reduction you will get a velocity increase. But unless there is somewhwere else for the fluid to go the mass flow rate will be the same. So why does the mass flow rate change?

Nothing goes in the massflow() function brackets. You just specify the locator with an @. Please look at the CFX reference guide for further details on this function.

[fahimeh456]

You are right.
If the mass flow rate doesn't change then what is the mass flow rate fraction?

[fahimeh456]

Do you know how I can find the exact location of hot spot along the channel in the cfx ?

[ghorrocks]

That's what you use post processing for.... Try CFD-Post.

[fahimeh456]

I try CFD-Post .