1. Assume the deposition velocity of O3 to a 30 m2 surface of interest is 1.6 m/
ID: 2303886 • Letter: 1
Question
1. Assume the deposition velocity of O3 to a 30 m2 surface of interest is 1.6 m/h a) Compute the reaction probability for the O3-material interaction assuming the following: Laminar flow with bulk airspeed of 0.2 m/s . Room temperature of 20 degrees Celsius . The characteristic length of the material is equal to the square root of the surface area (area -30 The Nusseldt number is given by the relationship . The Diffusion coefficient of O3 in air is 0.15 cm/s The Boltzmann velocity for O, is 3.6x104 cm/s at 20 degrees Celsius b) What proportion of the "resistance" to reactive uptake is due to transport phenomena vs. reaction phenomena? Is transport or surface reaction the rate- limiting process?Explanation / Answer
(a) Information is insufficient.
Reaction probability is defined as the fractional likelihood of a reaction given a collision between a surface and reactive pollutant in air. Deposition velocity gradually decreases with time as the reactive sites available for ozone reaction are consumed by ozone, a phenomenon known as "Surface aging".
Volume of reactor, length of reactor and pseudo first order rate coefficient is required to calculate.
(b) (1) Information of proportion required.
(2) In any reaction probability, surface reaction is the rate limiting process
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