Why is viscosity not included in the Orifice Plate equation?
Does the question bother you that viscosity is not included in the Orifis equation ? Imagine that honey flowing through a pipe and vice versa water flowing through a pipe will have the same pressure drop. You guessed it, the pressure drop would not be the same. So why is viscosity not in the equation? This question confused Tony Rudolph for 15 years until he had a moment of York.
We owe this discovery to Sir Osborne Reynolds. To understand this, let us give a simple example. Imagine we pour honey and water on a slide. Who do we reach first?
Water is reduced compared to honey at first. Why? The answer in simple words is that water tends to its surface less than honey. This phenomenon is recorded in the Reynolds issue
The “counter” consists of three variables that can be called inertial forces. V = velocity, D = diameter, density p = while “denominator” consists of one term and is the absolute viscosity. Hence, the Reynolds number is the ratio of “inertial forces” to “viscous forces”. Thus, more Reynolds numbers have more “inertial forces”. And for a span meter, one of the requirements is a large number of Reynolds. So as the “viscous forces” in the very high Reynolds are negligible, we do not consider them in this equation. Thank you for reading. I hope you find it valuable. Credibility: I stumbled upon this concept in the book Lessons in Industrial Instruments by Tony R. Copaldet .
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