Lab 4

# Lab 4 - 1 Introduction Energy is a property of objects and...

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1) Introduction: Energy is a property of objects and systems which are conserved by nature and is also defined as the ability to do work. Energy can be expressed in many forms such as kinetic, thermal and potential. An energy equation had to be developed that applies to all these different forms of energy. For kinetic energy, the energy equation contains a lot of variables that can create error which can be resolved by adding what is called the ‘kinetic energy correction coefficient’ which has the symbol ‘α’. The coefficient α is an important constant because it helps in calculating the true velocity of the flow since the average velocity equation is not accurate. The reason that average velocity is not accurate is that in the case of non-uniform velocity distribution, the velocity head of an open channel flow is generally greater than the value computed by using the average velocity. Therefore, the purpose of this lab is to calculate that coefficient using readings taken from a leaf blower and the energy equation. 2) Procedures: First of all, the ambient temperature of the lab was recorded to be 300 K. In order to take dynamic pressure readings, a manometer and a pitot-static probe were set which are used in the experiment. The transformer was set to power of 33% and the leaf blower was turned on so that the

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## This note was uploaded on 03/28/2011 for the course ENG 213 taught by Professor Himen during the Spring '11 term at SJVCS.

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Lab 4 - 1 Introduction Energy is a property of objects and...

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