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公开(公告)号：US09933347B2
公开(公告)日：2018-04-03
申请号：US15511121
申请日：2015-09-15
Applicant: Stellenbosch University
Inventor： Cornelius Louwrens Pieterse
CPC classification number: G01N9/24 , B05B5/0255 , G01N9/00 , G01N27/002
Abstract: A method and system for determining a density of a fluid is provided. The method is carried out using an electrospraying apparatus connected in the system. At a first step fluid is introduced into an emitter of the electrospraying apparatus. A voltage is applied between the emitter and a counter-electrode spaced apart from the emitter for a number of intermittent time periods, wherein the duration of at least some of the time periods during which the voltage is applied progressively decreases. The current between the emitter and the counter-electrode is measured for each time period during which a voltage is applied and the shortest time period for which a current reading is obtained is recorded. The shortest time period is used to calculate the density of the fluid in the emitter.
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公开(公告)号：US20170173606A1
公开(公告)日：2017-06-22
申请号：US15316660
申请日：2015-06-05
Applicant: STELLENBOSCH UNIVERSITY
Inventor： Cornelius Louwrens Pieterse , Paul Papka
CPC classification number: B05B5/0255 , B05B5/035 , B05B17/04 , B64G1/401 , B64G1/405
Abstract: A method of providing a suitable candidate liquid for an electrospray system is provided. At a first step an aperture radius for an aperture of the electrospray system (10) through which the liquid to be electrosprayed is drawn is obtained. Next, a corona threshold electric field curve as a function of relative permittivities of candidate liquids is calculated to determine the electric field at which undesirable corona discharge will occur. The maximum surface tension that can be electrosprayed by the system is calculated and then a candidate liquid which has a chosen relative permittivity and a surface tension that is equal to or less than the maximum surface tension is provided, to thereby provide a suitable candidate liquid with an appropriate surface tension to result in electrospray that meets the requirements of the electrospray system.
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公开(公告)号：US20170276583A1
公开(公告)日：2017-09-28
申请号：US15511121
申请日：2015-09-15
Applicant: Stellenbosch University
Inventor： Cornelius Louwrens Pieterse
CPC classification number: G01N9/24 , B05B5/0255 , G01N9/00 , G01N27/002
Abstract: A method and system for determining a density of a fluid is provided. The method is carried out using an electrospraying apparatus connected in the system. At a first step fluid is introduced into an emitter of the electrospraying apparatus. A voltage is applied between the emitter and a counter-electrode spaced apart from the emitter for a number of intermittent time periods, wherein the duration of at least some of the time periods during which the voltage is applied progressively decreases. The current between the emitter and the counter-electrode is measured for each time period during which a voltage is applied and the shortest time period for which a current reading is obtained is recorded. The shortest time period is used to calculate the density of the fluid in the emitter.
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