1/13/2023 0 Comments Dynamic vs kinematic viscositySimply put, dynamic viscosity gives you information on the force needed to make the fluid flow at a certain. Thus the KV for microalgae biodiesel should be monitored to ensure a high biofuel quality. Here are the numerical values of the kinematic viscosity of the main types of oils, for comparison: Transformer oil - 24.1 cSt at 70 ° C Hardening oil 100-120 cSt Hydraulic oil - from 4.6 to 150 cSt at 40 ° C Turbine oil - from 20 to 59 cSt at 50 ° C.These values are approximate. The EN 14214 is more rigorous for this parameter, and some microalgae-based biodiesels do not meet this specification as seen in Table 10.4 because most microalgae species show a high degree of unsaturation and long-chain fatty acid contents. Factors such as growing conditions and lipid extraction may affect the fatty acid profile and consequently the biodiesel properties ( Soares et al., 2014). Kinematic viscosity is the dynamic viscosity divided by the density. >Absolute (Dynamic) viscosity is numerically equal to the force to shear a plane of fluid surface of area of a unit square meter, over another plane surface at. However, in another study ( Song et al., 2013), this microalgae-based biodiesel was according to the specification (4.5 mm 2 s − 1). Viscosity describes a fluids internal resistance to flow and may be thought of as a. If you divide kinematic viscosity by the fluid density, you get absolute viscosity. Thus, dynamic viscosity is a measure of force, while kinematic viscosity is a measure of velocity. Dynamic viscosity is the quantitative expression of fluid’s resistance to flow, while Kinematic viscosity is the ratio of the fluid’s viscous force to the inertial force. For the Brazilian standard, only Phaeodactylum tricornutum presents biodiesel with KV (2.9 mm 2 s − 1) slightly lower than the minimum established ( Gangadhar et al., 2015). Kinematic viscosity incorporates fluid density as part of its measurement. The biodiesel viscosity from oilseeds, animal fat, and microalgae are in accordance with the ASTM standard. As shown in Table 10.4, biodiesel presents greater viscosity than diesel due to a higher degree of unsaturation and by oxidation reactions that can modify the fatty acid composition during storage, transportation, and temperature change ( Knothe and Steidley, 2007). The dynamic viscosity determines the film thickness provided by the oil. Kinematic viscosity (KV) is a physical property related to the chain length and degree of saturation thus, this criterion is associated with oxidation stability and IV. Density actually provides a way to convert between a kinematic and a dynamic viscosity measurement. Kinematic Viscosity: What’s the Difference. Tzovenis, in Microalgae-Based Biofuels and Bioproducts, 2017 10.4.3 Kinematic viscosity
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