skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Dry particle generation with a 3-D printed fluidized bed generator

Abstract

We describe the design and testing of PRIZE (PRinted fluidIZed bed gEnerator), a compact fluidized bed aerosol generator manufactured using stereolithography (SLA) printing. Dispersing small quantities of powdered materials – due to either rarity or expense – is challenging due to a lack of small, low-cost dry aerosol generators. With this as motivation, we designed and built a generator that uses a mineral dust or other dry powder sample mixed with bronze beads that sit atop a porous screen. A particle-free airflow is introduced, dispersing the sample as airborne particles. The total particle number concentrations and size distributions were measured during different stages of the assembling process to show that the SLA 3-D printed generator did not generate particles until the mineral dust sample was introduced. Furthermore, time-series measurements with Arizona Test Dust (ATD) showed stable total particle number concentrations of 10–150 cm -3, depending on the sample mass, from the sub- to super-micrometer size range. Additional tests with collected soil dust samples are also presented. PRIZE is simple to assemble, easy to clean, inexpensive and deployable for laboratory and field studies that require dry particle generation.

Authors:
ORCiD logo [1];  [1];  [2]
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Dept. of Earth, Atmospheric and Planetary Sciences
  2. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Dept. of Earth, Atmospheric and Planetary Sciences and Dept. of Civil Environmental Engineering
Publication Date:
Research Org.:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1361121
Alternate Identifier(s):
OSTI ID: 1374976
Grant/Contract Number:
SC0014487
Resource Type:
Journal Article: Published Article
Journal Name:
Atmospheric Measurement Techniques (Online)
Additional Journal Information:
Journal Name: Atmospheric Measurement Techniques (Online); Journal Volume: 10; Journal Issue: 6; Journal ID: ISSN 1867-8548
Publisher:
European Geosciences Union
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES

Citation Formats

Roesch, Michael, Roesch, Carolin, and Cziczo, Daniel J. Dry particle generation with a 3-D printed fluidized bed generator. United States: N. p., 2017. Web. doi:10.5194/amt-10-1999-2017.
Roesch, Michael, Roesch, Carolin, & Cziczo, Daniel J. Dry particle generation with a 3-D printed fluidized bed generator. United States. doi:10.5194/amt-10-1999-2017.
Roesch, Michael, Roesch, Carolin, and Cziczo, Daniel J. Fri . "Dry particle generation with a 3-D printed fluidized bed generator". United States. doi:10.5194/amt-10-1999-2017.
@article{osti_1361121,
title = {Dry particle generation with a 3-D printed fluidized bed generator},
author = {Roesch, Michael and Roesch, Carolin and Cziczo, Daniel J.},
abstractNote = {We describe the design and testing of PRIZE (PRinted fluidIZed bed gEnerator), a compact fluidized bed aerosol generator manufactured using stereolithography (SLA) printing. Dispersing small quantities of powdered materials – due to either rarity or expense – is challenging due to a lack of small, low-cost dry aerosol generators. With this as motivation, we designed and built a generator that uses a mineral dust or other dry powder sample mixed with bronze beads that sit atop a porous screen. A particle-free airflow is introduced, dispersing the sample as airborne particles. The total particle number concentrations and size distributions were measured during different stages of the assembling process to show that the SLA 3-D printed generator did not generate particles until the mineral dust sample was introduced. Furthermore, time-series measurements with Arizona Test Dust (ATD) showed stable total particle number concentrations of 10–150 cm-3, depending on the sample mass, from the sub- to super-micrometer size range. Additional tests with collected soil dust samples are also presented. PRIZE is simple to assemble, easy to clean, inexpensive and deployable for laboratory and field studies that require dry particle generation.},
doi = {10.5194/amt-10-1999-2017},
journal = {Atmospheric Measurement Techniques (Online)},
number = 6,
volume = 10,
place = {United States},
year = {Fri Jun 02 00:00:00 EDT 2017},
month = {Fri Jun 02 00:00:00 EDT 2017}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.5194/amt-10-1999-2017

Save / Share:
  • We describe the design and testing of PRIZE (PRinted fluidIZed bed gEnerator), a compact fluidized bed aerosol generator manufactured using stereolithography (SLA) printing. Dispersing small quantities of powdered materials – due to either rarity or expense – is challenging due to a lack of small, low-cost dry aerosol generators. With this as motivation, we designed and built a generator that uses a mineral dust or other dry powder sample mixed with bronze beads that sit atop a porous screen. A particle-free airflow is introduced, dispersing the sample as airborne particles. The total particle number concentrations and size distributions were measured duringmore » different stages of the assembling process to show that the SLA 3-D printed generator did not generate particles until the mineral dust sample was introduced. Furthermore, time-series measurements with Arizona Test Dust (ATD) showed stable total particle number concentrations of 10–150 cm -3, depending on the sample mass, from the sub- to super-micrometer size range. Additional tests with collected soil dust samples are also presented. PRIZE is simple to assemble, easy to clean, inexpensive and deployable for laboratory and field studies that require dry particle generation.« less
  • An exploratory study was undertaken to demonstrate the potential for using a fluidized bed riser system for the dry separation of fine particles. The experimental system consisted of a constant-diameter riser, two different operational heights, optional internal rings and one specific test mixture. Good separation efficiencies were obtained with a modest mass flux through the system. Further research is required to optimize the separation process and bring the concept to commercial viability.
  • A fluidized bed aerosol generator was used to produce respirable aerosols containing predominately single glass fibers. Two fiber types were aerosolized, a large diameter commercial insulation fiber and a smaller diameter experimental glass fiber. Aerosols produced by the fluidized bed generator were characterized as to concentration, fiber length and fiber diameter using scanning electron microscopy. A point-to-plane electrostatic precipitator used to collect fibers was found to preferentially deposit fibers > 0.1 micrometer in diameter at an angle to the collection surface. A method to eliminate this sampling artifact is described. Generator operating parameters were found to influence the characteristics ofmore » the aerosol produced. For the smaller fibers, increasing the air flow through the generator from 25 to 45 liters/minute decreased the median aerosolized fiber length from 7.2 to 5.9 micrometers but did not alter fiber diameter (0.2 micrometers). Aerosol output from the generator varied from 2.1 to 4.0 mg/min as the generator flow rate varied from 25 to 38 liters/minute. Increasing the bed volume from 100 to 200 milliliters increased the aerosol output from 1.4 to 4.2 mg/min under constant air flow conditions. The aerosol produced changed slowly with time. The median length decreased from 6.9 to 4.7 micrometers in 28 minutes and the aerosol output dropped to a plateau of 10% of its initial value after 15 minutes of operation. This output level persisted for at least 100 minutes.« less
  • An apparatus was designed to adequately simulate the characteristics of a particle bed formed by nuclear reactor fuel after the reactor has been operable for some length of time at high power. This was accomplished by using a 10 Kw, 453 Kc induction heater, coupled through a multi-turn work coil to particle beds of cast steel shot and lead shot in water. The temperature response and dryout condition were determined for various bed levels, particle diameters, and heat fluxes. Analysis of the data retrieved from the bed was used to generate a family of curves to predict the necessary conditionsmore » for dryout to occur within a fluidized particle bed with internal heat generation. The results presented here, with internal heat generation, show that previous results with bottom heating and volume heating are conservative.« less