Re: Tesla Turbine (again)



On Sun, 17 Feb 2008 01:52:17 -0800, your dog wrote:

It depends on friction rather than reactive momentum transfer, causing
irreversibility and unavoidable loss of efficiency. It's good for some
specialized applications, but not where efficiency in important.

friction != inefficiency. Clutches are frictional too. All turbines have
losses. It being good for some specialized applications was exactly what I
figured. Do you know of any such specialized applications where you see
them?

Running as a pump, I understand they can handle unusual liquids without
clogging. IIRC, one of the applications was pumping water containing
live fish without harming them.

Friction is in fact equal to efficiency loss, as it represents
irreversibility. You can't heat a brake and get mechanical energy out.

Again, IIRC, the max theoretical efficiency of a tesla turbine is on the
order of 60%.

There are some heated discussions in the sci.energy.hydrogen archive
back around 1996-99. Just search for "tesla turbine".

.



Relevant Pages

  • Re: Tesla Turbine (again)
    ... specialized applications, but not where efficiency in important. ... friction!= inefficiency. ... All turbines ...
    (sci.energy)
  • Re: Controllable torque electric motor questions
    ... efficiency loss is almost entirely due to frictional losses, which you need to take into account going from the torque at the motor to the torque at the shaft. ... but if your mechanism is designed to not move you need neither motor nor gearbox. ... As soon as things start moving the gearing efficiency _does_ matter a _lot_. ... because Colombic friction is not a viscous drag that is somehow proportional to velocity, it is a constant torque that must be overcome. ...
    (rec.crafts.metalworking)
  • Re: itty bitty gas turbine on a chip
    ... Not on turbine blades to my knowledge, but this may have been done ... You forget regenerative gas turbines that use low pressure loss heat ... This can get 60% TD efficiency all by itself no ... > small dimensions and the possibillity of ceramics. ...
    (sci.energy)
  • Re: Reduction of efficiency with Temperature
    ... Raising the sink temperature reduces this efficiency. ... (the 'real turbine' process has a larger increase in entropy from the 'ideal ... A higher moisture content will increase ...
    (sci.energy)
  • Re: "Who Killed the Electric Car?" opens July 14th
    ... They preheat the air after compression, ... why steam engines are less efficient than internal combustion engines, ... Pre-heating the incoming air reduces the efficiency. ... This was done in the 40s, a combination turbine and diesel engine meant ...
    (rec.arts.sf.fandom)