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Blend time, sometimes termed mixing time, is the time to achieve a predefined level of homogeneity of a tracer in a mixing vessel. Blend time is an important parameter to evaluate the mixing efficiency of mixing devices. [1] In order to make this definition valid, the tracer should be in the same physical phase (e.g. liquid) as the bulk material.
P 2 and V 2 the initial pressure and volume of the other cylinder and P 3 is the equilibrium pressure. An example could be a 100-litre (internal volume) cylinder (V 1) pressurised to 200 bar (P 1) filling a 10-litre (internal volume) cylinder (V 2) which was unpressurised (P 2 = 1 bar) (resulting in both cylinder equalising to approximately 180 ...
The difference in PO 2 can be used to calculate PHe, or conversely, a desired trimix product partial pressures can be used to calculate the PO 2 for the nitrox and trimix stages of the blend. Example: Desired product 50% helium, 16% oxygen, remainder nitrogen (34%). The PO 2 after the helium addition must be 0.16 bar if there is negligible ...
Example: Choose a gas mixture suitable for a bounce dive to 50 metres, where P O 2 must be limited to 1.4 bar and equivalent narcotic depth to 30 metres: Pressure at 50 m depth = 6 bar Required P O 2 = 1.4 bar : Oxygen fraction F O 2 = 1.4/6 = 0.23 = 23% Required equivalent narcotic depth (END) = 30 m Equivalent air pressure at 30 m = 4 bar
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The fractional result of this mathematical division is often expressed as a percent. For aircraft with external drop tanks, the term internal fuel fraction is used to exclude the weight of external tanks and fuel. Fuel fraction is a key parameter in determining an aircraft's range, the distance it can fly without refueling.
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These methods are often more time-consuming than entering the values into a VCF calculator; however, due to the variance in methodology and computation of constants, the tables published by the American Petroleum Institute are preferred when dealing with the purchase and sale of crude oil and residual fuels.