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<strong>Hydraulic</strong> <strong>Library</strong> 4.2<strong>User</strong> <strong>Manual</strong>Figure 2.45: Liquid leakageThis air stays in the liquid as cavities and canmodify the fluid compressibility. In this contextwe talk about effective bulk modulus. Figure2.46 shows the bulk modulus of a diesel fuel at40 °C with 0, 0.01, 0.1, 1, 10% air. The plot isobtained using the system shown. The model ofthe diesel fuel properties is based on accurate experimentalmeasurements and are designed for use with injection system whichare very fast acting. For this reason air is assumed to be entrained rather thandissolved.Figure 2.46: Air is entrainedDissolved airAir can also be dissolved in a liquid. A certain amount of air molecule can bepart of the liquid. In this case the dissolved air does not significantly change thefluid properties.43
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