Dryness Fraction: Dry or Wet Steam?

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Discussion Overview

The discussion revolves around the concept of dryness fraction in steam, specifically whether a high dryness fraction indicates dry or wet steam. Participants explore the definitions and implications of dryness fraction in relation to steam quality, enthalpy, and entropy equations.

Discussion Character

  • Conceptual clarification, Debate/contested

Main Points Raised

  • One participant questions whether a high dryness fraction means the steam is dry or wet.
  • Another participant suggests that "dryness fraction" may be synonymous with "quality."
  • A participant explains that dryness fraction refers to the amount of unboiled water left in the steam and its role in enthalpy and entropy equations.
  • There is a suggestion that if a high dryness factor indicates a lot of unboiled water, it would imply that the steam is wet, raising confusion about the terminology.
  • A later reply indicates that the dryness fraction actually represents the fraction of water that has been converted into steam, which could clarify the term "dryness."

Areas of Agreement / Disagreement

Participants express differing views on the interpretation of dryness fraction, with some suggesting it indicates wet steam while others propose it signifies the fraction of steam produced. The discussion remains unresolved regarding the terminology and its implications.

Contextual Notes

There are limitations in the definitions and interpretations of dryness fraction, with participants relying on their notes and prior knowledge, which may not encompass all aspects of the concept.

bill nye scienceguy!
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does a high dryness fraction mean that the steam is dry or wet?
 
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Dryness fraction? Do you mean quality?
 
possibly two different names for the same thing?

what I am talking about is the amount of unboiled water left in the steam.

its used in the enthalpy and entropy equations:

h= hf + x[dryness fraction].hfg

s= sf + x.sfg
 
bill nye scienceguy! said:
does a high dryness fraction mean that the steam is dry or wet?

bill nye scienceguy! said:
possibly two different names for the same thing?

what I am talking about is the amount of unboiled water left in the steam.

its used in the enthalpy and entropy equations:

h= hf + x[dryness fraction].hfg

s= sf + x.sfg
If a high "dryness factor" means there is a lot of unboiled water (i.e. water vapor) left in the steam, then I would think that would mean the steam is wet. I'm surprised they would call that "dryness"!
 
i looked further into my notes and i think it actually means the fraction of water that has been boiled into steam, explaining 'dryness'. thanks for your input!
 

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