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Thank you BigInch, my use of "induced flow" was incorrect. I was meaning buoyant flow as you've correctly picked up.

Think I've found the answer thank you. Had a look at fluid statics and it appears to be all about the weight of the column of fluid, i.e. how manometers work. The profile of the temperature along the pipe will definitely influence the buoyancy pressure differential. Strange however that how many...

I'm trying to obtain a proper understanding of buoyancy-driven flow. My main question is whether the shape of the temperature profile throughout the length of the pipe has any influence on the pressure difference created? Consider a vertical pipe of length L (also equal to height difference h)...

Thank you for all the posts. I have since looked more into Perry's Handbook, after hacksaw's earlier comments and found some more valuable information in there. I'm currently working my way through it.

I'm starting to think that Corus may actually be right that it is unity, if you consider all the radiation emitted by surface 1 is seen by the gas (transmitted/absorbed) and the same for surface 2. I'll think about it and try to research it more.... Compositepro, the presence of just the H20...

Hacksaw, yes, most Heat Trasnfer textbooks give the view factors for surface-surface geometries and that is easy, but I'm looking for the view factor from the gas volume to the respective surfaces. Not sure if I'm trying to overcomplicate the problem.

Thank you Corus. The "gas" emits as a volume source, and because the areas of the inner and oute pipes differ, I'm not convinced that unity is the answer.

No, not for school. It is for the design of a process heat exchanger. Actually there are 2 annuli. The outer annulus has the combustion gas and an inner annulus has a mixture of steam and CO2. The combustion gas annulus is used to heat the steam/CO2 mixture.

I'm trying to solve the heat transfer in a pipe annulus that transports combustion gas. My question is how to determine the view factors. A few text books uses the electrical network analogy to solve radiation between 2 surfaces separated by an absorbing and transmitting medium (combuston gas...