Air Flow Calculation for Orifices: Diameter and Length Requirements

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Discussion Overview

The discussion centers on calculating the air flow (volume flow in m3/s) through orifices of varying diameters (1mm, 1.2mm, and 1.5mm) with a specified length of 1mm. The context involves air at room temperature being sampled from the atmosphere at a pressure of 1013 mbar, with regulated pressures behind the orifice of either 100 mbar or 200 mbar.

Discussion Character

  • Technical explanation, Homework-related

Main Points Raised

  • One participant inquires about the calculation of air flow through specific orifice diameters and lengths under given pressure conditions.
  • Another participant suggests using a free program called "Daniel orifice flow calculator" for flow rate calculations, noting the need for internal pipe sizes.
  • A further response clarifies that the program mentioned is not suitable for the specific case of a nozzle (orifice) without an outer diameter.
  • Another participant proposes using Bernoulli's energy equation to solve for the flow, emphasizing that energy is constant in this context.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the best method for calculating the flow rate through the orifices, with differing opinions on the applicability of external tools and equations.

Contextual Notes

The discussion does not resolve the applicability of the Bernoulli's equation to the specific scenario presented, nor does it clarify the limitations of the suggested program for calculating flow rates through orifices.

irisaa
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Hallo,
How to calculate the air flow (volume flow in m3/s) through an orifice of diameter ∅ 1mm, 1.2 mm and 1.5 and length 1mm? The air at room temperature is sampled through the orifice from atmosphere at pressure 1013 mbar. The pressure behind the orifice is regulated at 100 mbar or 200 mbar.
Thank you for your help
 
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Hi, there's a nice free program that will help you calculate the flow rate. Google "Daniel orifice flow calculator". You'll need an internal pipe size to complete the calculation. :smile:
 
Thank you but thus program works for pipe only with inner and outer diameter included as beta coefficient.
My question concerns only nozzle (orifice) of ∅ 1mm, 1.2 mm and 1.5 mm with no outer diameter.
 
You can use the Bernoulli's energy equation to solve for the flow noting that it is constant.
 

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