# Recent content by darkside00

1. ### Spiral Plate Heat Exchangers

By Spiral plate, do you mean helical type baffles? can you describe a spiral plate heat exchanger, and are you asking about the thermal analysis, or structural (stress) analysis as in TEMA?
2. ### Calculating volume flow rate per unit width of a plate ( Fluid Mechanics )

you can try integrating with respect to y giving the area under the curve, right? while setting the limits properly. I'm sure you know shear stress = mu*(dV/dy) also, this is homework
3. ### Heat through a semi-infinity solid

Here's a paper on shape factors (page 20): http://v5.books.elsevier.com/bookscat/samples/9780123735881/9780123735881.pdf
4. ### Calculating required pressure to maintain flowrate

For a simple/rough and incompressible calculation using bernoullis principle: http://en.wikipedia.org/wiki/Bernoulli%27s_principle E.g. (v1^2)/2 + g*z1 + P1/p = (v2^2)/2 + g*z2 + P2/p This obviously ignores the losses but gives an idea. Also, assuming your pouring to atmosphere and using...
5. ### Portable compressor power calculation

What is the source of that equation? you cant even run a typical light bulb on 16 watts
6. ### Calculating required pressure to maintain flowrate

Can treat it like a restriction orifice. It will consider the discharge coefficients depending on thickness, viscosity, temperatures, diameters, reynolds #, etc. to give more accurate #'s The head pressure required might make your container quite high?
7. ### Need high-temp rubber coating

could try a belzona coating depending on what your doing http://www.belzona.com/products.aspx They are usually painted on smooth, but I can imagine you cant make it rougher when you apply it. Also expensive but good for temps up to 180°C
8. ### How is a wankel engine lubricated?

I believe when I had an RX8 it used 5w20
9. ### Finite Element Analysis - Author J.N Reddy Book

In two elements K11^3 = 0 as there is no U4 either. Its just the notations that are generally written for more than two elements
10. ### Heat Transfer Refrigeration Problem

The actual heat transfer given out by your refrigeration unit will be different than your input power (10KW) if that's the case?. Even with insulation your gonna get some loss. I think the actual time to cool it down to steady state temperature wont be long given your power and convection.
11. ### Higgs field popular descriptions

Who is the target audience really? I have trouble understanding it, because I don't have the graduate mathematics to know the notations. All these shows that on youtube, news or Nova are interesting, but really, what are they trying to accomplish? I think it is only to gain public interest the...
12. ### Higgs field popular descriptions

yeah, I think Physicists need to 'dumb it down' for the layman to help explain their mathematics and particle observations.
13. ### How do aeroplanes fly

for thick airfoils, its about naca computations....
14. ### How do aeroplanes fly

Thin airfoil theory can give you analytical results: http://www.desktop.aero/appliedaero/airfoils1/tatderivation.html [Broken] of course this only applies to thin airfoils
15. ### Calculate angle of attack

looks like that paper only covers navigation (interesting paper). angle of attack and slip angle are going to change as the plane fly's.