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Heat Pulse - Laminar Flow

Posted Jun 21, 2017, 6:11 a.m. EDT 1 Reply

Thomas David Machin
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Hi,

I have a relatively simple problem; however, I'm finding it hard to find the solution.

I have laminar flow in a pipe and want to have a pulse of heat at the inlet for 0.5 seconds, I then want to monitor this pulse for ten seconds with the pulse switched off.

I can not find a way to generate this pulse and have tried to do this through generating a pulse in definitions; however, am not able to implement this after into the heat transfer in fluids physics.

Help would be greatly appreciated.

Thanks
1 Reply Last Post Jun 23, 2017, 2:21 a.m. EDT
Mohammad Amin Kazemi
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Posted: 7 years ago Jun 23, 2017, 2:21 a.m. EDT
Updated: 7 years ago Jun 23, 2017, 2:22 a.m. EDT
Thomas,

You may use a rectangular function.

1) Go to model1 -> definition -> functions -> rectangle
change the lower and upper limits as you desire (i.e. 0 s and 0.5 s).

2) Define a heat flux at the inlet as: Q_inlet*rect1(t[1/s])

To monitor the outlet, you may integrate the total heat flux (ht.ntflux) at the outlet after you solved the problem and plot it with time.

Amin,
Thomas, You may use a rectangular function. 1) Go to model1 -> definition -> functions -> rectangle change the lower and upper limits as you desire (i.e. 0 s and 0.5 s). 2) Define a heat flux at the inlet as: Q_inlet*rect1(t[1/s]) To monitor the outlet, you may integrate the total heat flux (ht.ntflux) at the outlet after you solved the problem and plot it with time. Amin,

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