Calculating Area of a Tesla Turbine | Power Output Formula

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Discussion Overview

The discussion revolves around the calculation of the area relevant to the power output of a Tesla turbine, as referenced in a specific paper. Participants explore the implications of the formula provided and its applicability to Tesla turbines, which consist of discs arranged with gaps.

Discussion Character

  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant references a paper that includes a formula for power output and seeks clarification on whether the area should consider only one side of a disc or both sides across all discs.
  • Another participant points out that the equation mentioned is on page 12 of the paper and suggests it may not be directly applicable to Tesla turbines, indicating it refers to a general flow section.
  • A third participant expresses doubt about the equation's ability to accurately describe the output of a Tesla turbine, noting the differences in driving forces compared to conventional turbines.
  • One participant agrees with the skepticism regarding the equation's applicability and adds that Tesla turbines are generally inefficient due to boundary layer drag and back pressure issues, questioning their justified use.

Areas of Agreement / Disagreement

Participants express disagreement regarding the applicability of the formula to Tesla turbines, with some questioning its relevance and others agreeing on the inefficiency of Tesla turbines in general.

Contextual Notes

There are unresolved assumptions regarding the specific definitions of area in the context of the formula and the characteristics of Tesla turbines compared to other turbine types.

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TL;DR
The power that can be generated by a Tesla turbine can be deduced by using a formula that has been given in a equation in given document. Want to know how the area (mentioned in the formula) can be determined for Tesla turbine.
Found this paper regarding performance of Tesla turbine. At the page 23, a formula regarding possible power output from a Tesla turbine is given. But, I want to know how to deduce the area given the formula. Tesla turbines are discs placed one after another with specific gaps in between the discs. I want to know, whether it's just the area of only one side of a single disc or both front and back part of all the discs that will come into contact with the flow.
 
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Page 12 of the paper, is on page 23 of the pdf file.
The equation is at the bottom of that page.
I believe that is a general equation, where area refers to the flow section of the turbine, not applicable directly to a Tesla turbine.
 
You want to mean that this equation can hardly describe the output for Tesla turbine, right? Me too have some doubt about that part. In case of common market available turbines, the driving force is either impulse or reaction. But, for a Tesla turbine, it's totally different. That's why this equation can't properly define the output IMO.
 
Correct.

The Tesla turbine is very inefficient compared to other turbines. I have yet to see a justified application.

The Tesla turbine is driven by boundary layer drag on the disc surfaces. Those close plates also create a back pressure that blocks the exhaust, reducing efficiency.

Because it has the Tesla name, it receives attention that it does not deserve.
 
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