1. Most equations for predicting plume rise contain two terms that account for d

Question

1. Most equations for predicting plume rise contain two terms that account for different physical reasons for the rise. What is the nature of these two terms? 2. Is it justifiable to use a constant value for the effective plume rise for a given situation, or should one in reality, adjust for the distance downwind from the stack? Discuss. 3. Sulfur dioxide is being emitted in a rural area at a rate of 0.90 kg/s from a stack with an effective stack height of 220m. The average wind speed at stack height is 4.8 m/s and the stability category is B. Determine the short-time period, downwind, center-line concentration in micrograms per cubic meter at ground-level distances of 1.0, 2.0 and 4.0 km. 4. What is the expected short-term period ground-level concentration at 150 and 250 m away from the downwind center line for the conditions given in Problem 3?

Explanation / Answer

QUESTION 01

The two terms used in equations for predicting plume rise account for the following two terms.

1. Momentum of the effluent

2. Heat content (raised to a power)

Usually, the momentum of effluent is included as a coefficient in the heat content, instead of adding it seperately.

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