Properties of water under high pressure as a function of Temperature

In summary, the conversation is about finding equations to describe properties of water under high pressure as a function of temperature, specifically for density, thermal conductivity, dynamic viscosity, and heat capacity at a constant pressure of 130bar and temperature range of 30°C to approximately 300°C. The expert suggests using tables of measurements for accurate results due to the anomalous properties of water.
  • #1
Conwedge
4
0
Hey,
I'm trying to find equations which describe properties of water under high pressure as a function of temperature. The equations are in polynomial form. i am trying to find a better approximation for the material properties of water(density,thermal conductivity, etc...), as the programs description is quite limited. (The program is COMSOL Multiphysics 3.5). Any help or resources you could suggest on this matter would be greatly appreciated.
Thanks
 
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  • #2
You do not fully list the properties to be considered.

Water has anomalous properties so any serious application will not rely on equations but tables of measurements.

Such tables are freely availbale and are usually called International Steam Tables or similar. Although they are called steam they include properties where the fluid is all liquid at elevated temperature because of the pressure.
 
  • #3
Thank you very much for your reply. I'm new to the forum, so Apologies for the lack of information. The properties I am most interested in are:
  • Density,
  • Thermal conductivity,
  • Dynamic viscosity,
  • Heat capacity at constant pressure.
The pressure is 130bar. The temperature ranges from 30°C to approx 300°C.

When you say anomalous, that means that water cannot be accurately described by equations?

So I would have to find properties for a range of temperatures and load its properties this way?
 

1. What is the relationship between temperature and water's properties under high pressure?

As pressure increases, water's properties are significantly affected by temperature. This is because high pressure can cause water molecules to become more tightly packed, leading to changes in their behavior and properties.

2. How does water's density change under high pressure and temperature?

As pressure increases, water's density increases, meaning that more water molecules are packed into a smaller space. However, at high temperatures, the opposite effect can occur, where the molecules have more energy and are able to overcome the effects of pressure, resulting in a decrease in density.

3. What happens to water's freezing and boiling points under high pressure?

Under high pressure, water's freezing point increases, meaning it requires a lower temperature to freeze. On the other hand, its boiling point also increases, meaning it requires a higher temperature to boil. This is due to the increased pressure affecting the energy and interactions between water molecules.

4. How does high pressure affect water's viscosity?

High pressure can cause water to become more viscous, meaning it has a thicker consistency and is less able to flow easily. This is because the increased pressure can cause the molecules to become more tightly packed, leading to increased resistance to movement.

5. What implications do the properties of water under high pressure have on Earth's deep oceans?

The properties of water under high pressure are crucial for understanding the conditions in the deep ocean. These conditions can impact ocean currents, marine life, and the exchange of heat and nutrients between the ocean and atmosphere. Understanding water's behavior at high pressure is essential for predicting and managing the effects of climate change and human activities on the oceans.

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