Aerosol Dynamics

• August 31: Reading change for class 6: Chapt 4 pp 75-82.
• Sept 7: HW2 will be handed out Tues Sept 13 and will be due in just 1 week, on the 20th. Just wanted to let you know for planning your schedules.
• Sept 8: I've switched the class activities/topics for classes 8 and 9. 9 is now problem solving, 8 is brownian motion, etc. Please see updated schedule on the web.
• Sept 27: HW3 has been updated, and due date is changed to Oct 11.
• Oct 11: Graduate student speaker presentation posted.
• Oct 26: yesterday I posted the new MW due in 2 weeks. Make sure you look at or even do the HW problems associated with coagulation, as that is a subject that will be on the next exam. You will need to pick up handouts associated with the HW - these are in the box across from my office door. The experiment description is also avail on the website, this is the graduate student upcoming lab in Nov. See you at the NCAR MESA lab, which is at the western most end of Table Mesa Blvd. stop by my office at 1:50 if you need a ride. I can take 4-5 students (if someone wants to ride in trunk:-) let me know if you are not coming.
• Oct 28: On page 5 of your notes on coagulation, under the section on collision frequency for laminar shear flow, equation (8) is incorrect. Instead of b, it should read dN/dt.
• Oct 31: I've been getting alot of requests for the takehome midterm to be scheduled over next weekend. Unfortunately that means that your next midterm and HW are due on the same day. So how about the following schedule:
  • Midterm handed out Thurs Nov 3 and Due the following Tues Nov 8
  • HW due date changed to Thurs Nov 10
  • Please let me know if this will NOT work for any of you.
• Nov 2: have only had 1 person ask me about this problem, but I thought I would send you some help anyways. You will need to create histogram bins from the data I gave you . Treat the Dp value from the table as the midpoint of the bin and then estimate the lower limit of the bin and the upper limit of the bin. That will give you the information you need to calculate Dlogdp.
• Nov 4: I think you may have the wrong equation in problem 6. The Equation 9.35 in Hinds is not dependent on particle diameter, as this is the minimum single-fiber efficiency based on the fiber diameter. This problem would make more sense if we compared to Eq 9.33a…
• Nov 4: For #2, does the “operating air flow velocity” refer to Face Velocity or Velocity inside the filter? It means the face velocity
• Nov 4: On the first problem are you referring to particle diameter or aerodynamic
  diameter? The book refers to both especially in chapter 11. If the answer to the problem depends on which diameter, make a note next to your answer for which diameter you are referring.
• Nov 8: please e-mail if you can NOT attend the lab visit to NOAA next week. It is crucial that I get the names of those not attending, as I will submit all the others that are attending for security clearances.
• Nov 14: here is the lab schedule. Note that 3 hours are reserved, but it (a) may not take this long, and (b) not everyone on your team has to be there until the very end, just make sure at least one or more of you can cover the pick up and clean up.
  • Wed Nov 16 2-5 pm Boonsri, Nick, and Fatimah
    Thurs Nov 17 10-1pm Jessica, Jessica, Pat, Dave
    Mon Nov 21 12-3 pm Jeanie, Austin, James, Mari
    Tues Nov 22 10-1pm Adam, Josh, Peter
  • Make sure you have downloaded the lab write up from the web site and read over. Our plan is to 1st go over equipment, experimental procedure, clean up. Then start experiment. Then review data analyses.
  • Please meet me in the engineering lobby, in front of the deans office.
• Nov 15: example done in class: An expansion-type CNC with water as the working fluid has a pressure expansion ratio of 1.21.  If the CNC is operated at a room temperature of 20 C and 740 mmHg pressure, what is the minimum particle diameter that can grow in the CNC (Kelvin diameter)? (Willeke p. 432 Example 19-1).
• Nov 22: As many of you remember, I will be away the week after thanksgiving - I am meeting with Boeing reps, Denmark Technological University and Kansas State University to plan a new research project on improving indoor air quality on aircraft. I tried very hard to schedule the meeting after finals, but the other participants had conflicts with dates in Dec.
  • On Tues Nove 29: we will have a guest lecture and you will be responsible for the content of that lecture.
  • On Thurs Dec 1: I would like to ask the graduate students to run the class. Each of you will join with another student (so teams of 2) and pick a problem to work out with the rest of the class. The problem can be from Hinds, from Friedlander, From Seinfeld and Pandis, or even from a journal article. Be creative, pick a problem that you are interested in. I will be checking e-mail on my trip, so please e-mail me your planned problem, graduate students. When I return, please turn into me your problem statement and your solution.
  • There are 14 graduate students, so there will be 7 problems total worked out in class. These may be be great examples of problems on the final exam!
• Nov 22: I'd like to host a pizza party for you all at the Sink. I am proposing Wed Dec 7 6:30 - 8pm. Please let me know if there are any major conflicts with this date and time! if you have a lot of work to do, you still need to eat dinner, so at least stop by.
• Nov 23: Reminder that there will be a guest lecture on Tues Nov 29. you will be responsible for the material presented, and there will be a question on the 3rd midterm exam on this material.
• Nov 23: there are 3 handouts across from my office door that you need to complete the HW.
• Dec 5: Last problem grad students only: N = 10^4 should really be No = 10^4 .
• Dec 6: helpful hint for problem 2, HW 6. You need to multiply the volume distribution (handout) by the curve for G in Figure 5.8 (handout from Friedlander), and then integrate. See page 138 equation 5.22 on the handout. On problem 3, in your material balance, you need a factor of 1/2 in the coagulation term. Please see lecture notes 11 equation (2).