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re: Finding the Massflow in a tube

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Old   July 2, 2007, 16:18
Default re: Finding the Massflow in a tube
  #1
Wooster
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Hi,

I have a cooling jacket made up of several tubes. I solve my model and then go to look at it in the CFX-post. What is the easiest way of isolating one tube and getting the massflow from that tube? Would I have to make separate mesh entities?

-W
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Old   July 2, 2007, 18:25
Default Re: re: Finding the Massflow in a tube
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Glenn Horrocks
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Hi,

The easiest way is to define it as a region when the mesh is generated then you can easily do a massflow function on the region.

Now that the simulation has been done you can also get it by using the plane tool and adjusting the extents until only the region you wish is enclosed. Then you can do a massflow on the plane. This can also be done with other shapes if another shape besides a plane describes your surface for the massflow.

Glenn Horrocks
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Old   July 2, 2007, 18:40
Default Re: re: Finding the Massflow in a tube
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Wooster
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Thanks Glenn,

Defining those regions is a little troublesome since there are so many of them so I'll go with the later. one more question: Once you put the plane over that "hole" you get a massflow distribution in the channel. Now massflow is a calc of density, velocity, and area. Is it safe to assume the area for a particular calc is the actual mesh node?

-W
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Old   July 3, 2007, 18:21
Default Re: re: Finding the Massflow in a tube
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Glenn Horrocks
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Hi,

Mass flow is the dot product of the fluid velocity and the local area vector, times the local density.

Glenn Horrocks
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Old   July 4, 2007, 19:44
Default Re: re: Finding the Massflow in a tube
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Wooster
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So (again, I'll take a closer look at my manual) what exactly is the area vector? Is it something integrated over the entire channel or just a number dealing with channel size?

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