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  • What is the difference between flow work and kinetic energy in . . .
    The energy balance equation (conservation of energy equation) over the static control volume is stated using internal energy $\tilde{U}$, kinetic energy $\tilde{E}_K$, and potential energy $\tilde{E}_p$, each here expressed per unit mass Within the defined control volume, we write terms for flow in out, change with time, and heat + work as
  • thermodynamics - Flow rate of a liquid - Physics Stack Exchange
    That is correct I use the definition of enthalpy (h = u + Pv) and what confuses me is the Pv = h - u For a liquid h = CpT and u = CvT but for liquids Cp is close to Cv In this case the flow energy would be almost 0 That's part of the confusion that I have And then there is that first equation that I saw in open systems $\endgroup$ –
  • How does energy flow in a circuit? Which is correct?
    The part of EM theory that describes energy flow is called Poynting’s theorem It says that energy in the EM fields moves from one place to another in a direction that is perpendicular to both the E field and the B field For a circuit there is a current which creates a B field which wraps circularly around the wire
  • Energy of a flowing fluid - Physics Stack Exchange
    This difference of "flow works" is net work of all the pressure forces on the fluid column To illustrate this is true, we can use a special kind of work-energy theorem: work of pressure forces on the fluid flowing in a streamtube equals change of kinetic + potential energy of that fluid to derive the Bernoulli equation
  • Is flow energy the same as work? - Physics Stack Exchange
    Even though the exit velocity is often considerably higher than the inlet velocity, in many cases, the increase in kinetic energy is insignificant (ke=0) Then the conservation of energy equation for this single-stream steady-flow device reduces to **h2>h1 (kJ kg)*
  • What is the interpretation of pressure times volume as energy?
    This means there is a flow of heat energy into the gas from the heat sink as the volume expands to maintain the temperature, and it is not too surprising that the result is that the work is infinite because there is a continuous flow of external energy into the system
  • What is Pressure Energy? - Physics Stack Exchange
    The pressure energy is the energy in of a fluid due to the applied pressure (force per area) So if you have a static fluid in an enclosed container, the energy of the system is only due to the pressure; if the fluid is moving along a flow, then the energy of the system is the kinetic energy as well as the pressure
  • thermodynamics - Is PV energy part of internal energy, U? - Physics . . .
    You need a bucket that comprises both the energy that flows into the internal energy, plus the energy that flows into the outside world Then you can say "hey, all of that heat energy definitely went into this bigger bucket!" and everything is theoretically simple again
  • Questions about flow work flow energy? - Physics Stack Exchange
    I am trying to understand the energy equation by tracking an element of fluid (closed system) in a flow, say through a turbine When every flow is involved the Open system control volume approach is applied But the same result should be obtained by following the energy interaction with a 'closed' element of fluid too
  • First law of thermodynamics, steady flow energy equation (SFEE) and
    But in steady state flow ,no particular trait of a fluid changes with time This means that the property of a fluid at a particular spatial point is constant in time(to be more mathematical,it's partial derivative with respect to time is zero) This means that the only way the energy of fluid can change in a constraint volume is by change in kinetic energy,change in potential energy or by work done





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