ME300Lecture24

ME300Lecture24 - Lecture 24: Adiabatic Flame Temperature...

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24.1 Lecture 24: Adiabatic Flame Temperature Question: » What is the condition of products for maximum temperature? Answer: » q = 0 adiabatic flame (combustion) temperature: internal combustion engine, for example, where combustion happens very quickly
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24.2 Continue Adiabatic Flame Temperature 1 st law energy balance to determine adiabatic flame temperature: Notes: » Need to solve this equation for product temperature, assuming uniform temperature of products. » Maximum achievable temperature for reaction since the entire enthalpy change is used to raise the product temperature. » Nee to solve iteratively, because only one temperature will solve the equation. oo i f,i T 298 i i f,i T 298 i prod react n h (h h ) n h h ) i,prod adia h h(T )
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24.3 Example 24.1 Given: Ethane, C 2 H 6 , is burned completely with 30% excess air. The reactants are initially @ 298 K and 1 atm. Find: The adiabatic flame temperature in a steady-flow process.
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ME300Lecture24 - Lecture 24: Adiabatic Flame Temperature...

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