Measurement of interfacial property
US9581535B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 13, 2013 |
| Grant date | Feb 28, 2017 |
| Priority date | — |
| Expiry date | Dec 17, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N13/02
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Interfacial tension between first and second immiscible liquids is determined using a device in which entrance and exit channels are connected by a cavity with wider cross-section. A flow of the first liquid enters the cavity as a jet and breaks into droplets within the cavity. Passage of a droplet through the exit channel feeds back to perturb the jet entering the cavity. An alternating signal applied to a heating element perturbs the incoming jet and is progressively scanned over a frequency range which includes the system's resonant frequency (frequency of droplet formation with no signal to the heating element). A bandwidth of frequency is observed in which the frequency of droplet formation is phase locked to the frequency applied to the heater. The ratio of resonant frequency to this bandwidth is a measurement of the interfacial tension between the two liquids.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.