liquid evaporation model with thermocouples inside the liquid in pool fire #12868
Replies: 27 comments 12 replies
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INSIDE WALL TEMPERATURE
…On Wed, May 1, 2024, 4:02 AM PurnaPushkalaSomasundaram < ***@***.***> wrote:
Hello, this is Purna from Politecnico di Milano, Milan. I have designed
the pool fire of corn oil using FDS using the cylindrical surface of the
tank. I would like to know the temperature of the oil inside the tank by
placing thermocouples. Is it possible by using FDS?
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Yes, I am predicting the burning rate of the fuel. Should I try to design each layer inside the tank using MATL and then place a device to measure temperature at each 0.01 m height of the entire height of 0.15 m tank? Does that make sense? |
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Your top layer should be liquid, and you can have solid layers below that. This should all be done on the SURF line. Your devices can be placed at any DEPTH. |
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okay and thank you. |
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what to do if your model's temperature is over-predicted than it should? |
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I did the grid analysis for the pool fire study of corn oil with required MLR with the heat of combustion. I get the results when the obstruction is square and single obstruction. But when I make multiple rectangular obstructions to form the required area, the temperature shoots up. |
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Okay sir I will do it. But if I need to design the inside of the obstruction with depths , what should I do? |
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At different heights inside the obstruction, I want to know the temperature using thermococuples. |
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yes sure and thanks. I will model them and will show them to know if it's right. Thanks a lot sir. |
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I have a doubt. Do I have to use a layered surface inside the tank to specify the temperature profiles? |
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If you want to model the interior of the tank, beneath the surface of the oil, FDS may not be the best tool. It does not account for the movement of the liquid, and the heat transfer is just one-dimensional. At best, you can estimate the liquid temperature just below the surface. |
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which is the best software for modeling the interior of the tank? |
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If so I want to model with FDS, how would I implement it for surfaces beneath the oil surface using 1D heat transfer? |
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Your SURF line would have multiple layers. The first would be the liquid, then the solid material under the liquid. |
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&SURF ID='BaseLayer', CONDUCTIVITY=1.0, SPECIFIC_HEAT=1000.0, TMP_FRONT=20.0 / |
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What solid material should I use under the first layer? |
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pool_fire1_AF.txt |
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I would like to know why the temperature of this case is high and how to reduce it. |
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I ran the coding and found it to be high. I ran using pyrosim interface and found that the depth at 13 cm should be a heat conducting surface. What does it exactly mean? |
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I am attaching the file from which I began to develop the layers and inside temperature. The flame temperature is fine at the moment using the attached file below. |
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I aim to model a solid obstruction (tank) with layers below it to find the inside wall temperature temperature within the solid. |
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This |
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I tried to model in this way the liquid pyrolysis model of corn oil to have in-depth temperature. Is it correct? &HEAD CHID='corn_oil_pyrolysis', TITLE='Corn Oil Pyrolysis Simulation' / &MESH IJK=100,80,80, XB=-2.5,2.5,-2.5,2.5,0.0,4.0 / &TIME T_END=5400.0 / &REAC ID='Corn Oil Pyrolysis', &MATL ID='Corn Oil', &SURF ID='Corn Oil Surface', &OBST XB=-0.35,0.35,-0.35,0.35,0.0,0.25, SURF_IDS='Corn Oil Surface' / &INIT ID='Initial Conditions', &VENT ID='Mesh Vent: Mesh01 [XMAX]', SURF_ID='OPEN', XB=2.5,2.5,-2.5,2.5,0.0,4.0/ &DEVC ID='1 cm depth', DEPTH=0.01, QUANTITY='INSIDE WALL TEMPERATURE', XYZ=0.0,0.0,0.25, IOR=3/ &TAIL / |
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You should only set |
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&SURF ID='Corn Oil Surface', You are still prescribing the HRRPUA and TMP_FRONT. |
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It does not say in any place that material is keyword. So, on the SURF ID should I mention only the external flux value? |
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Hello, this is Purna from Politecnico di Milano, Milan. I have designed the pool fire of corn oil using FDS using the cylindrical surface of the tank. I would like to know the temperature of the oil inside the tank by placing thermocouples. Is it possible by using FDS?
Beta Was this translation helpful? Give feedback.
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