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1、Air PollutionAir PollutionQuestions for the Last Lecture1. Please give examples of Primary particulates and secondary particulates.2. For particles too large or too small, how to modify the Stokes law.AnswerPrimary particles are found in the atmosphere in the form in which they were emitted.Fly ashZ
2、nO FumeCoal dustCement dustAnswer(3) secondary particlesSecondary particles are formed in the atmosphere from gaseous pollutants which are called as the precursors.Secondary particlesTobacco smokesulfuric MistBlack smoke of carCxHySO2CxHyprecursorsParticles too large for Stokes Lawwhen Rp H, the par
3、ticles will be captured on the bottom wall of chamber.collection efficiency(2) Block flow model Efficiency= Fractional captured =collection efficiencySubstituting Stokes law equation in the above equation.D2(3) Mixed flow modelTotally mixing in the z direction but not in the x direction.Assumptions,
4、 Page 252Mixed flow model and Block flow model Diameter of the particles, Collection efficiency, % mixedblockShortcoming of Gravity settlersThis type of device would be useful for collecting particles with diameters of perhaps 100m, but not for smaller particles of air pollution interest. 100 15100
5、515 This Lecture and the Next Lectureq This Lecture: v Chapter 9 Page 249280q The Next Lecture: v Chapter 9 page 280314ExerciserPage 315 9.7 9.10DISCUSSIONTopics about Air pollution:q Introducing yourselfq Interesting news or information about air pollution your having read or heardq Your opinions on this Air Pollution courseq Your suggestions for Chinese Air Pollutionq Other familiar issues about Air Pollution
