Turbulence / Boundary Layers Fire tube boilers have been used for over 100 years to generate steam.

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Question:

Turbulence / Boundary Layers Fire tube boilers have been used for over 100 years to generate steam. A diagram is provided. Your employer, a leading boiler provider, is developing a new model that will require CFD verification. The lead designer provides you with the following information: There will be 75 1.5” diameter tubes, 4 feet long Mass flow to the tubes will 0.529 lbm/s flue gas (assume air) Temperature of entering gas will be 1500 K Initial verification will be on a single tube. What flow model will you use ? How thick will be the first cell ? What is your inlet velocity to the “tube” model? After providing results, the designer comes back to your office. He says that a mistake has been made in your conditions, and he is very sorry! The entering temperature is 1500 F (it is America!). In the meeting, he asks how much of difference it will make? 4. Other than inlet conditions change, will there be any other changes to your model? You do not have to provide the new value – just identify a change. For instance – the density will change. Just ID that density will change – you don’t have to provide the new (or old ) value. CFD . Firetube Boiler Model Set up CFD Models for both conditions for Firetube boiler . What is the exit velocity and temperature for each CFD run? 1.Provide screen shots of: 2.Residuals 3.Monitor 4.Solution Methods 5.Final 10 iterations