Experiment: Nguyen Group_20220412_None_Ammonium sulfate


Name: Nguyen Group_20220412_None_Ammonium sulfate
Date: 2022-04-12

Nguyen Group

Tran's big bag of air

Experiment Set
Particle wall loss experiments

Characterize wall loss of AS to dry chamber walls

Performed wall loss of dry AS for 6 hours

Experiment Details


  • Instrument/Chamber characterization
Temperature: 22
Relative Humidity: 5
Seeded Experiment: Yes
Type of Seed: Ammonium sulfate
Initial Seed Concentration Value: 240
Seed Concentration Units: micrograms_per_cubic_meter
Fuchs Adjusted Surface Area:
Condensation sink rate coefficient: 5
Reaction type:
Oxidant Name: None
Initial Oxidant Concentration Value: 0 (parts_per_million)
RO2 Main Fate: Not Sure
RO2 Lifetime: (Seconds)
Pressure: 755 Torr

Data Set plots
Choose a file: Choose the X-Axis:

Experiment Set Details

Name: Particle wall loss experiments
Time format and units: HH:MM
Experiments to characterize the effects of various chamber parameters (light, humidity, temperature, particle liquid water content, seed aerosol chemistry, and recent chamber contents) on particle wall losses in a 10 m3 Teflon-walled atmospheric chamber.


  • Kelvin H Bates


Principal investigator:

Tran B. Nguyen
Phone: 5307525987
E-mail: tbn@ucdavis.edu
OrcID: 0000-0001-9206-4359

Data Manager:

Kelvin H. Bates
E-mail: kelvinhbates@gmail.com

220412_Timeline.csv Timeline

Time (HH:MM) Action
10:29 RHT/NOx/O3 on
10:45 SMPS on
10:54 Seed injection starts
11:19 Seed injection ends (seed concentration is 240 ug/cm3)
11:21 10 mixing air bursts
11:22 Wall loss starts
16:43 Wall loss ends
16:43 RHT/Nox/O3 off
16:43 SMPS off

Light Flux Characterizations:
Particle Loss Characterizations:
Vapor Loss Characterizations:

Chamber Details

Name: Tran's big bag of air
Volume in cubic meters: 10
Shape: Rectangular Prism
Surface area in cubic meters: 28
Flow Mode: Batch
Flow through rate in liters per minute:
Body Material: Teflon
Body thickness: 2
Replacement date:
Replacement frequency: As needed
Cleaning method: Flushing with air Flushing with air with UV lights on Oxidation
o3 background: < 0.5 ppb
nox background:
Particle background in micrograms per cubic meter:
Air filtration method: Custom filtration canisters to remove NOx, hydrocarbons, water, particles, ozone, SOx from pressurized ambient air.
Mixing method: 1
Mixing method material: Pulsed air jets, manually actuated
Temparature Control: Yes
Temparature measurements recorded: Yes
Temparature range (min degrees celcius):
Temparature range (max degrees celcius):
Humidity Control: Yes
Humidity Measurements Recorded: Yes
Relative humidity range (min percent):
Relative humidity range (max percent):
Particle experiment capability: 1
Lights: Yes
Light source type(s): UV broadband black lights (centered at 350 nm)
Supplemental information:
Additional Notes: 40-Watt, Osram/Sylvania 350nm black lights, 48” long, T12 fluorescent; 72 bulbs, 36 each on two facing walls, with UV-reflective siding on all walls. Lights are controlled via 6 panels (3 on the right wall - top, mid, bottom - and 3 equivalent on the left wall).