Pulse powder delivery of 0.25mg for a few seconds

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Discussion Overview

The discussion revolves around finding an effective delivery mechanism for a granular powder, specifically targeting a precise dosage of 0.25 mg to be delivered in pulses for a few seconds. The context includes considerations of fluid mechanics and the challenges associated with powder delivery systems.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • Venkat seeks a bulk delivery system for a granular powder without liquefying or aerosolizing it.
  • Aero 51 suggests an injection method similar to dye for fluid mechanics experiments, though this may not apply if the powder cannot be liquefied.
  • Venkat reports failure with the injection method due to compaction issues and mentions that an Auger Feed mechanism was too large for the desired dosage.
  • Another participant proposes using high frequency, low amplitude vibrations to address caking issues in the delivery system.
  • Pharmaceutical tablet presses and capsule fillers are mentioned as potential solutions for the delivery mechanism.

Areas of Agreement / Disagreement

Participants express various methods for delivering the powder, but there is no consensus on a single effective solution. The discussion remains unresolved regarding the best approach.

Contextual Notes

Challenges include the need to avoid liquefying the powder and the limitations of existing delivery mechanisms like the Auger Feed. The particle size of approximately 20 microns may also influence the effectiveness of proposed methods.

vkar16
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Hi,

I am trying to create a laboratory scale system, where I would like to deliver 0.25 mg of a substance which is granular and powder like consistency. I would like to pulse it for a few seconds and stop it. Can anybody tell me a good delivery mechanism for this. I have a method to disperse it but I am not able to find a bulk delivery system for that specs.

Thanks and best regards
Venkat
 
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Would this be for an experiment pertaining to fluid mechanics? If so you should be able to use an injection method similar to dye. If even if its not fluids related a dye-analogous method may be worth investigating.
 
Hi Aero 51. I could not succeed in the injection method as I am not supposed to liquefy or convert it to an aerosol. When used as is, the powder only compacts but does not come out. I tried using a Auger Feed mechanism (1.5 cm dia) but it was too large for the dosage I am looking into. The particle size is about 20microns in dia for my particles. Thank you for your suggestion though.
 
If caking is an issue you could always use the injection method with the added configuration of high frequency, low amplitude vibrations throughout the delivery system.
 
Pharmaceutical tablet presses and capsule fillers come to mind.
 

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