Water vs. water/glycol flow rates

In summary, the flow rate through a round, sharp-edged orifice is affected by the composition of the fluid passing through it. In the case of a mixture of 30% water, 55% Dihydroxydiethyl Glycol, and 15% Polyalkylene Glycol, the orifice may need to be larger than for plain water to achieve the same flow rate. The mass flow rate is inversely proportional to the square root of the mass density of the liquid, so it is important to consider the density of the mixture compared to that of pure water. Further research and estimates may be needed to determine the exact increase in size required for equivalent flow rate.
  • #1
blakej
13
0
I'm trying to get a rough idea of how flow rate through a round, sharp edged orifice is affected when a fluid is water/glycol versus pain water. In this circumstance, it's 30% water, 55% Dihydroxydiethyl Glycol and 15% Polyalkylene Glycol. I don't need exact numbers at this point, just a qualitative direction. My gut is saying that the glycol component is going to require the orifice to be larger than for plain water at the same pressure and flow rate. Can anyone provide what they think would be a safe estimate for how much larger to go to get an equivalent flow rate of the water/glycol versus water, or provide any online resources that may help?

Thanks!
Blake
 
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  • #2
Flows thru orifices have been studied extensively:

http://en.wikipedia.org/wiki/Orifice_plate

The mass flow rate thru an orifice is inversely proportional to the square root of the mass density of the flowing liquid. It's not clear what the mass density of your water-glycol mixture is compared to that of pure water.
 

1. What is the difference between water and water/glycol flow rates?

The main difference between water and water/glycol flow rates is the addition of glycol, which is a type of antifreeze. Water/glycol mixtures are commonly used in industrial systems to prevent freezing and corrosion. The glycol content affects the flow rate of the mixture, so it is important to consider when determining flow rates.

2. How does the viscosity of water and water/glycol mixtures affect flow rates?

The addition of glycol to water increases the viscosity, or thickness, of the mixture. This can result in a decrease in flow rate compared to pure water. Higher glycol concentrations will have a greater impact on viscosity and flow rates than lower concentrations.

3. What factors influence the optimal flow rate for water and water/glycol mixtures?

The optimal flow rate for water and water/glycol mixtures depends on several factors, including the type of system, the purpose of the fluid, and the temperature. For example, in a heating or cooling system, the flow rate must be high enough to transfer heat effectively, but not so high that it causes excessive pressure or energy consumption.

4. How can I determine the appropriate flow rate for my system?

The appropriate flow rate for a system can be determined through calculations or by consulting with a fluid dynamics expert. Factors such as pipe size, fluid properties, and system design must be considered to determine the optimal flow rate for a specific system.

5. What are the consequences of incorrect flow rates for water and water/glycol mixtures?

Incorrect flow rates for water and water/glycol mixtures can have serious consequences. Insufficient flow rates can lead to inadequate heat transfer, system inefficiency, and potential equipment damage. On the other hand, excessive flow rates can result in unnecessary energy consumption, increased pressure and strain on the system, and potential leaks or bursts in pipes.

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