Determine the quality/moisture of the vapor/water mixture

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  • Thread starter Krokodrile
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In summary, the conversation is about asking for help with two problems related to using the correct units and getting strange results. The person also mentions symbols and asks for clarification on the concept of "quality." The symbols discussed include vf, vg, and x, which represent specific volume of steam, specific volume of liquid, and quality (mass fraction of vapor in a liquid/vapor mixture) respectively. After some discussion, it is determined that the specific volume values for steam and liquid should be switched, and the person apologizes for their mistake.
  • #1
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Homework Statement
1.- A 20 L container without air contains 5 kg of pure water at 250 Celcius. Determines the mass and volume of the liquid water as well as the quality and moisture.

2.-An 80% quality saturated water vapor mixture has a temperature of 210 Celsius. Determine the pressure, the specific volume of the mixture as well as the specific energy of the mixture
Relevant Equations
X = v - vf/vg - vf
v = V/m
x = mg / n
Vg = mg (vg)
Hello! ;)
I need help with two problems.

I ready resolve it, but i have a question about if a use the units of the correct way. Because got a little strange results.

Captura de Pantalla 2021-05-22 a la(s) 20.41.35.png
 
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  • #2
No idea what you mean by "quality" and your symbols are a bit cryptic. Please elaborate.
 
  • #3
Borek said:
No idea what you mean by "quality" and your symbols are a bit cryptic. Please elaborate.
Quality: mass fraction of vapor in a liquid/vapor mixture
vf = specific volume of steam
vg = specific volume of liquid
x = quality
 
  • #4
Krokodrile said:
vf = specific volume of steam
vg = specific volume of liquid
Looks like it's the other way round, looking at the numbers.
 
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Likes jim mcnamara
  • #5
mjc123 said:
Looks like it's the other way round, looking at the numbers.
vf = specific volume of liquid
vg = specific volume of steam

so, sorry. Yep, my mistake
 

1. How is the quality/moisture of a vapor/water mixture determined?

The quality/moisture of a vapor/water mixture is determined by measuring the ratio of water vapor to dry air in the mixture. This can be done using various methods such as psychrometry, dew point measurements, or gravimetric analysis.

2. Why is it important to determine the quality/moisture of a vapor/water mixture?

Determining the quality/moisture of a vapor/water mixture is important in a variety of industries, including HVAC systems, food production, and pharmaceuticals. It helps ensure the proper functioning and efficiency of equipment, as well as the quality and safety of products.

3. What factors can affect the quality/moisture of a vapor/water mixture?

The quality/moisture of a vapor/water mixture can be affected by factors such as temperature, pressure, humidity, and the presence of other gases or contaminants. Changes in these factors can alter the composition and properties of the mixture.

4. How does the quality/moisture of a vapor/water mixture impact its properties?

The quality/moisture of a vapor/water mixture can impact its properties in several ways. For example, a higher moisture content can increase the potential for corrosion and mold growth, while a lower moisture content can affect the taste, texture, and shelf life of food products.

5. What are some common methods for measuring the quality/moisture of a vapor/water mixture?

Some common methods for measuring the quality/moisture of a vapor/water mixture include using a psychrometer, which measures the relative humidity of the air, or a hygrometer, which measures the water vapor content directly. Other methods include using dew point sensors, moisture analyzers, or moisture meters.

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