Questions tagged [vapor-pressure]

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What is the input pressure and a suitable feed composition for a Peng-Robinson EOS Python program?

It's a strange question, I know. Essentially I am supposed to use a Python program to generate VLE data for a binary mixture. I have the components and their critical values (Tc, Pc, acentric factor), ...
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38 views

What contaminant materials should be avoided for reaching ultra-high vacuum?

This question relates to ultra-high vacuum chambers (order of ~$10^{−10}$ mbar) in experimental setups. [This question was asked at physics.stackexchange.com but removed due to being more about ...
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58 views

Usage of Thermodynamic Steam Tables

Having both the pressure and temperature for saturated-liquid in a particular state of a cycle, I was interested in its enthalpy. When looking at steam tables I am not sure if I should use the ...
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37 views

Fully saturated liquid and vapour

In terms of fully saturated vapour and liquid for water. Why in a real world heat pump cycle for example may the water not exactly reach these saturation lines as indicated in an ideal cycle?
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3answers
107 views

Can temperature gradient keep concrete wall below 100% RH in 100% RH atmosphere?

Consider a high and wide concrete wall of say 30 cm thickness, covered with a sheet of vapor barrier on one side, and a sheet of say 30 cm thick and effective insulation on the other side. The vapor ...
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37 views

How to calculate adiabatic air temperature loss caused by increase of humidity?

I'm searching for an approach on how to calculate the adiabatic temperature loss of air when increasing its humidity by a humidifier. Assumed we have the following setup: Air measuring position 1 (...
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2answers
292 views

How does placement of a pressure gauge in a tank of fluid affect the pressure readings?

This is not a real system but rather something I made up to understand how the placement of pressure gauge in a tank takes its readings. Here’s a diagram of it- The pressure gauge placed in the ...
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29 views

When is the Equal Pressure Point in a Typical ICE?

My question refers to a typical bog standard normally-aspirated 4-cylinder petrol/gasoline engine. Let's say it's a 2.0 litre engine (10:1 compression ratio, firing order 1-3-4-2) operating at 2000 ...
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1answer
5k views

2 Parameter Margules derivation

I'm trying to find online the derivation for the 2 parameter margules equation but cant find it anywhere. basically need to prove $$ \frac{d}{dn1} (x_{1}x_{2}(A_{21}x_{1} + A_{12}x_{2})) = x_2^2(A_{...
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43 views

Force and Headloss Calculations for Three Stage Condenser

I am looking for some guidance on calculations for a natural condenser project. I am a Computer Engineering student, so this stuff is out of my range. The fundamental question I am trying to answer ...
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185 views

Mass Transfer from an Oxygen Bubble

I think there is an error in this questions solution and I want someone to check: Example 8.1-4:Mass transfer from an oxygen bubble A bubble of oxygen originally 0.1 cm in diameter is injected ...
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768 views

How do temperature and pressure influence the rate of evaporation of water in a closed vessel?

I am trying to solve a fairly simple question but I'm kind of stuck on the technicalities: Imagine that water is evaporating into initially dry air in the closed vessel shown schematically in Fig....