Calculating Vena Contracta K Factor: Inlet and Outlet Pressure Difference Method

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Discussion Overview

The discussion revolves around the calculation of the K factor for a vena contracta using the inlet and outlet pressure difference method. Participants explore various approaches to determining this factor, focusing on the relationship between pressure differences and the resulting calculations.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant suggests calculating the K factor by finding the inlet and outlet pressures, determining the pressure difference, and using it to find the height (h) for rearranging the equation h = K (V2/2g).
  • Another participant inquires about additional methods that could be employed for this calculation.
  • A different participant questions whether the pressure difference should reflect the actual pressure drop compared to the ideal pressure drop when calculating h for the equation.
  • A link to a resource is provided, possibly containing relevant information on vena contracta.

Areas of Agreement / Disagreement

Participants have not reached a consensus on the best method for calculating the K factor, and multiple viewpoints regarding the use of pressure differences remain present.

Contextual Notes

There are potential limitations in the assumptions made about pressure drops and the definitions of actual versus ideal conditions, which have not been fully resolved in the discussion.

Who May Find This Useful

This discussion may be of interest to those studying fluid dynamics, particularly in the context of flow through contractions and the vena contracta phenomenon.

Physicist3
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To calculate the K factor for a contraction, do you find the inlet pressure and outlet pressure and then find the difference, then divide the pressure difference by rho x gravity to find the value of h and then rearrange h = K (V2/2g) to find K because I am unsure otherwise?
 
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What else one can do?
 
Cheers. Am i right in thinking the pressure difference between the actual pressure drop and ideal pressure drop should be used to find h for use in the eqtn?
 

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