Lecture 13 - We learned 5.3 Mechanical Energy Balance 1 2 2...

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1 We learned… 𝑃𝑃 𝜌𝜌 + 1 2 𝑉𝑉 2 + 𝑔𝑔𝑔𝑔 𝑜𝑜𝑜𝑜𝑜𝑜 𝑃𝑃 𝜌𝜌 + 1 2 𝑉𝑉 2 + 𝑔𝑔𝑔𝑔 𝑖𝑖𝑖𝑖 = 𝑊𝑊 𝑠𝑠𝑠𝑠𝑠𝑠𝑠𝑜𝑜 ̇ 𝑚𝑚̇ − 𝑙𝑙 𝑤𝑤 Eq. 5-3 Mechanical Energy Balance (MEB) for a steady, incompressible flow. 𝑙𝑙 𝑤𝑤 is energy loss per unit mass [J/kg] due to frictional heat and irreversibility and is either zero (frictionless flow) or positive for real flows . 5.3 Mechanical Energy Balance CV 𝒎𝒎 𝒊𝒊𝒊𝒊 ̇ = 𝝆𝝆 𝟏𝟏 𝑽𝑽 𝟏𝟏 𝑨𝑨 𝟏𝟏 𝒎𝒎 𝒐𝒐𝒐𝒐𝒐𝒐 ̇ = 𝝆𝝆 𝟐𝟐 𝑽𝑽 𝟐𝟐 𝑨𝑨 𝟐𝟐 𝑾𝑾 ̇ 𝒔𝒔𝒔𝒔𝒔𝒔𝒔𝒔𝒐𝒐 𝒍𝒍 𝒘𝒘 𝒎𝒎 𝒊𝒊𝒊𝒊 ̇ 𝒆𝒆 𝟏𝟏 𝒎𝒎 𝒐𝒐𝒐𝒐𝒐𝒐 ̇ 𝒆𝒆 𝟐𝟐 1 2 Example
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2 5.3 MEB 𝑃𝑃 𝜌𝜌 + 1 2 𝑉𝑉 2 + 𝑔𝑔𝑔𝑔 𝑜𝑜𝑜𝑜𝑜𝑜 𝑃𝑃 𝜌𝜌 + 1 2 𝑉𝑉 2 + 𝑔𝑔𝑔𝑔
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