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Chemistry study guide

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ANSWER TO QUESTIONS in Page 25: 1. How does flame height change for increase/decrease of primary aeration? 2. How does flame height change for increased jet flow rate? They are directly proportional. 3. How does replacing methane with propane affect the burner design assuming the total burner power remains the same? This effect is generally known as the stoichiometry effect and the effect is as follows: With the increase of flame length, all design factors will change like nozzle velocity, the fuel/air ratio and other factors. 4. What is the effect of aeration with oxygen rather than air? Note that replacing air with oxygen is essentially the same as increasing the mole ratio of oxygen from around 0.21 (normal mole fraction of oxygen in air) to 1.00 (pure oxygen). ADDITIONAL QUESTION AND ANSWER: DISCUSSION: I. Jet Flame Physical Description > As the fuel flows along the flame axis, it diffuses radially outward, while the oxidizer diffuses radially inward. > The flame surface can be defined as: > The products formed at the flame surface diffuse radially both inward and outward > An overventilated flame is where there is more than enough oxidizer in the immediate surroundings to continuously burn the fuel > Underventilated flame is the opposite of an overventilated flame > Flame length for an overventilated flame is determined at the axial location where: > By ignoring the effects of heat released by reaction, the equation below provides a crude description of flame ...
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