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Mechanical Engineering

MohammadReza

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  1. hello why dimensionless temperature in heat transfer is: theta= (T-Tinf)/(Ts-Tinf)? why it is not (T/Tinf) like dimensionless velocity which is u/Uinf ?
  2. thank you🙏 so what are EOS for near critical region?where can i find them?
  3. can you please tell me why equation of states are incorrect near critical point? please help me
  4. why we called (uv) Reynolds stresses ?
  5. hi. i want the derivation of these equations. where can i find it?
  6. what does this paragraph mean in cengel thermodynamics (it is on page 119): Above the critical state, there is no line that separates the compressed liquid region and the superheated vapor region. However, it is customary to refer to the substance as superheated vapor at temperatures above the critical temperature and as compressed liquid at temperatures below the critical temperature. where is this region " it is customary to refer to the substance as superheated vapor at temperatures above the critical temperature "? i attached a pic. i don't know whether i understan it or not
  7. Hello, I need some information about super critical fluids properties. How to determine, what are related equation, etc. If you know any book or article, please tell me
  8. hello, i have a question. why turbines works with hot steam?why don't we use cold air? is it related to second low of thermodynamics?
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