gvf
gvf
It stands for gradient vector flow.
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Of course, the value of a medal depends upon who happens upon it being for sale, who is in the auction room, and so on. It also depends on the condition, although the Ashanti Star is a fairly robust medal, and so not often found in a poor state. The 2008 Medal Yearbook gives a value of about £220. A VF-condition (it had minor cleaning residues, but otherwise GVF), was sold at auction (Spink & Son) in London on 24 July 2008 for £130 hammer price, £172.05 total price after commission and so on. Ultimately, the medal is worth what you, as a collector, think it is worth to you. You might have a passion for the Ashanti story, so you may be prepared to pay more for a medal.
The limitation of Coriolis meters in measuring foamy oil or entrained gas can vary with the design of the sensor. In general, low Gas Volume Fractions - less than 5% - do not affect the mass measurement of a liquid. The mass of the gas in proportion to the mass of the liquid is too small to have a significant impact. The density measured by the Coriolis meter will be reflective of the combined stream, for example a 1,000 kg/m3 fluid will have a measured density of approximately 995 kg/m3 with a 5% GVF. This will impact volume measurements as the volume output is a function of dividing the mass by the measured density of the fluid. With increasing Gas Volume Fractions, the accuracy of the mass and density measurement can be impacted, depending upon various application parameters (viscosity, velocity etc.). Because performance will vary with design, you should consider providing detailed application information to a couple of Coriolis manufacturerers to confirm how their meters will perform, critical appication parameters required and experience in providing solutions for entrained gas applications.
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