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In determining the reynolds number for the annulus, the hydraulic diameter comes from using the perimeter of the inside pipe and flow area between the two pipes. the equivalent diameter is equal to 4 times the hydraulic diameter divided by the wetted perimeter. A good book for heat transfer is...

I've used Aspen Plus to size relief valves. It does a dynamic simulation of the valve--showing when the valve opens and closes. It would sometimes give a larger or smaller valve, depending on the scenario.

Sounds like your designing a liquid/liquid separator. You don't have to know a whole lot to do this, but you need to know how each phase is going to split to get your physical properties. Chemical Process Equipment by Walas is a good book that covers what you need. You will have to figure out...

if you want to make sure that all of the steam is condensed, then you will need to use a trap. with atmospheric pressure, this can be done by using a bucket trap and giving it sufficient hydrostatic head to let it operate. if you know that your always going to be at atmospheric pressure, then...

you could use a differential pressure transmitter across a restrictor - which can be an orifice. you wouldn't want to take a lot of pressure drop, but enough to give you decent results. omega makes a FLR1000 turbine flowmeter for less than $200 which operates on 12 VDC. The output is a 0-5...

Does anyone know anything about the efficiency of a gas engine running on lighter hydrocarbons? Like if you took a regular gas engine and ran it on methane or propane? I'm wondering how the fuel mileage would compare.

I worked on my thesis in college in this area. What I have seen and read is that the enhancement comes from the high temperatures seen by the reactants. Microwaves work well with polar solvents, but not so well with non-polar organics. The subject is not easy to explain, because you can...

I do quite a lot of Aspen modeling, but am unfamilar with fuel cells. You can most likely model one using the custom user blocks/models. If you need some help, let me know.