Bernoulli's principle with venturi effect

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SUMMARY

This discussion focuses on the application of Bernoulli's principle and the Venturi effect in a specific project involving airflow dynamics. The user seeks to determine the vacuum pressure at a designated point (B) and whether the suction from an inlet operating at 500 CFM and 700°F can be increased. Key insights include the understanding that mass flow remains constant across any cross-section, and that CFM can only increase with significant changes in temperature or pressure that affect gas density. Additionally, friction and viscosity in the piping system will contribute to pressure loss.

PREREQUISITES
  • Understanding of Bernoulli's principle
  • Familiarity with the Venturi effect
  • Knowledge of airflow dynamics and CFM calculations
  • Basic principles of fluid mechanics
NEXT STEPS
  • Research the calculations for vacuum pressure using Bernoulli's equation
  • Explore the effects of temperature on gas density and CFM
  • Learn about friction loss in pipes and its impact on airflow
  • Investigate the design and optimization of Venturi tubes
USEFUL FOR

Engineers, HVAC professionals, and anyone involved in fluid dynamics or airflow optimization will benefit from this discussion.

Diokaef
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So, I need some info on how to get the data that I'm missing on my project.

My english is not great and is very hard for me to try figure this out by myself so if you guys could help me out I will appreciate.

I need to know how much vacuum in HG I will get at the B on my picture, and if will increase the suction from my B inlet (500 CFM at 700F) mean increase its velocity output from 500CFM to ?

I will be using fans to provide a 75mph wind at the A inlet then reduce the pipes until I can divide that to 12 hoses with inside of 1/8" 36" long to a collector kind thing then will flow around of a 2 1/4" pipe, on this pipe I have already a 500CFM at 700F and I need to know how much if any increase would have at that stage (ex. 500 CFM increase to 700 CFM)

Man, I'm really having problems with this thing.
 

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Mass flow across any cross section in this device will be constant. CFM will only increase if the temperature increases enough or pressure decreases enough to create a significantly large decrease in density.

Assuming this is a real device, then pressure will decrease even in the constant diameter section of pipes, due to friction with the walls of the pipes, and viscosity (friction within the gas itself).
 

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