Understanding Quality: Uncovering the Relationship between Variables

  • Thread starter Thread starter rojak44
  • Start date Start date
  • Tags Tags
    Quality
Click For Summary

Discussion Overview

The discussion revolves around understanding the concept of quality in thermodynamics, particularly in relation to entropy and the state of a saturated fluid. Participants explore how to calculate quality and internal energy based on given variables, with a focus on engineering applications.

Discussion Character

  • Homework-related
  • Technical explanation

Main Points Raised

  • One participant expresses confusion about where a specific value in a problem originates and seeks clarification.
  • Another participant suggests that quality can be determined using entropy and the final fluid state, indicating that the relationship between entropy and temperature is key to finding quality.
  • A participant shares their understanding of calculating quality using the formula x=(v-vf)/vfg and expresses confusion about finding specific volume given a mass.
  • Another participant clarifies that they are using entropy to find quality with the formula x=(s-sf)/sfg and indicates they have reached an answer after this clarification.

Areas of Agreement / Disagreement

The discussion shows a progression from confusion to understanding, with some participants agreeing on the methods to calculate quality, while initial uncertainties about specific values and formulas remain unresolved.

Contextual Notes

Participants rely on specific definitions of quality, entropy, and fluid states, which may not be universally agreed upon. There are also unresolved steps regarding the calculation of specific volume based on mass.

Who May Find This Useful

This discussion may be useful for students or individuals studying thermodynamics, particularly those dealing with concepts of quality, entropy, and fluid mechanics in engineering contexts.

rojak44
Messages
13
Reaction score
0
untitled-5.jpg

sorry if i posted this in wrong section..
im having problem on where the value in the circle come from,can someone give me an answer or a hint.
TQ
100820091016.jpg
 
Last edited:
Physics news on Phys.org


Hi rojak. This should be in the engineering homework section.

Anyway, do you know how to determine quality? They give you entropy and they tell you the final fluid state is saturated. From the information on entropy and temperature, you should be able to determine the quality. They don't show you how to do that in the example.

Once you have quality, you should be able to determine the internal energy. Again, they don't show you how to do that, but perhaps you can figure it out now.
 


thank for the reply ^ ^
my english is not so good,here what i understand. find the quality x=(v-vf)/vfg, then substitute it in u=uf+xufg.
im confuse now.. i only have mass of 1.5kg,how do i find the specific volume?
v=V/m
V=?
 


thanks! i understand now.. s1=s2..
im using s to find the quality x=(s-sf)/sfg
i got the answer now,thank you very much!
 

Similar threads

Engineering What is the Relationship Between Resistor Values in an Attenuator Circuit?
  • · Replies 6 ·
Replies
6
Views
1K
Engineering Loads on a shaft with V-Belts
  • · Replies 2 ·
Replies
2
Views
3K
What is a proper quality post
  • · Replies 14 ·
Replies
14
Views
3K
Jumble Word Game with Point Tracker: A Fun Way to Practice Coding
  • · Replies 8 ·
Replies
8
Views
2K
Other Questions on quality of research
  • · Replies 1 ·
Replies
1
Views
1K
Engineering Can I use root locus when the input is the negative feedback?
  • · Replies 8 ·
Replies
8
Views
2K
Engineering Solving Momentum Conservation Problems: Tips & Tricks
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad Statistical modeling and relationship between random variables
  • · Replies 7 ·
Replies
7
Views
2K
Static B.C & first moment of area of connecting rod
  • · Replies 4 ·
Replies
4
Views
2K
Understanding how to use steam tables
  • · Replies 8 ·
Replies
8
Views
5K