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Effect of emitter geometry on flow rate sensitivity to voltage in cone jet mode electrospray

Effect of emitter geometry on flow rate sensitivity to voltage in cone jet mode electrospray
Effect of emitter geometry on flow rate sensitivity to voltage in cone jet mode electrospray


The effect of voltage on flow rate within cone jet mode electrospraying has been investigated, with particular emphasis on the effect of emitter geometry. A set of experiments investigated the effect of the outer and inner diameters on the flow rate relationship to voltage, in cone jet mode electrospray. This was accomplished by the use of a high fidelity flow meter, capable of measuring changes in flow rate to a fraction of a nanolitre per second.

It has been previously demonstrated that there are two separate parameters that influence the flow rate sensitivity to voltage; the hydraulic resistance of the flow system, and the outer diameter of the emitter. By a simple derivation, the second of these two is explained by the variation of theoretical electric pressure with voltage, as the outer diameter is varied.

Good agreement is found between experimental and theoretical results, suggesting the simple theory reasonably explains the physics of the situation.

As well as elucidating the physics involved in electrospray—suggesting the electric field is an important controlling parameter within cone jet mode electrospray—the theoretical and experimental agreement has important implications for variable throttling of thrust in colloid thrusters, and could bring about better optimization of performance in other electrospray-employing fields.
0022-3727
1-8
Ryan, Charles
3627e47b-01b8-4ddb-b248-4243aad1f872
Katherine, Smith
0980453d-ae36-47cb-b5b4-22102db76199
Mathew, Alexander
58d3aedc-f14f-40e4-82bc-dac14e9c7c55
Stark, John
cf8da964-ba02-4d93-b9d6-096fba5a31ab
Ryan, Charles
3627e47b-01b8-4ddb-b248-4243aad1f872
Katherine, Smith
0980453d-ae36-47cb-b5b4-22102db76199
Mathew, Alexander
58d3aedc-f14f-40e4-82bc-dac14e9c7c55
Stark, John
cf8da964-ba02-4d93-b9d6-096fba5a31ab

Ryan, Charles, Katherine, Smith, Mathew, Alexander and Stark, John (2009) Effect of emitter geometry on flow rate sensitivity to voltage in cone jet mode electrospray. Journal of Physics D: Applied Physics, 42 (15), 1-8. (doi:10.1088/0022-3727/42/15/155504).

Record type: Article

Abstract



The effect of voltage on flow rate within cone jet mode electrospraying has been investigated, with particular emphasis on the effect of emitter geometry. A set of experiments investigated the effect of the outer and inner diameters on the flow rate relationship to voltage, in cone jet mode electrospray. This was accomplished by the use of a high fidelity flow meter, capable of measuring changes in flow rate to a fraction of a nanolitre per second.

It has been previously demonstrated that there are two separate parameters that influence the flow rate sensitivity to voltage; the hydraulic resistance of the flow system, and the outer diameter of the emitter. By a simple derivation, the second of these two is explained by the variation of theoretical electric pressure with voltage, as the outer diameter is varied.

Good agreement is found between experimental and theoretical results, suggesting the simple theory reasonably explains the physics of the situation.

As well as elucidating the physics involved in electrospray—suggesting the electric field is an important controlling parameter within cone jet mode electrospray—the theoretical and experimental agreement has important implications for variable throttling of thrust in colloid thrusters, and could bring about better optimization of performance in other electrospray-employing fields.

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Published date: 10 July 2009
Organisations: Astronautics Group

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Local EPrints ID: 384328
URI: http://eprints.soton.ac.uk/id/eprint/384328
ISSN: 0022-3727
PURE UUID: 22f80290-e83c-4a82-a3b6-fc0292ffd181

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Date deposited: 27 Nov 2015 16:59
Last modified: 19 Jul 2019 20:26

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