![]() The viscosity of fluids can be expressed in terms of either dynamic viscosity or kinematic viscosity. Fluids differ in the internal resistance that is exerted, causing differences in viscosity as well. In fluids, the resistance to flow or to deform is known as viscosity. In fluids, the resistance to flow or to deform is known as viscosity ![]() Whenever a fluid is not subjected to physical forces other than gravitational force, kinematic viscosity is the right measurement. When external forces are applied to a fluid, dynamic viscosity measurements are the best choice. Overall, the sequence of influence on kinematic viscosity of oxygenated moieties is COOH approximately equal to C-OH>COOCH3 approximately equal to C=O>C-O-C> no oxygen.No two fluids can have the same kinematic viscosity, but they can have the same dynamic viscosity. the alcohol moiety is noted for the C10 compounds compared to unsaturated C18 compounds. A reversal in the effect on viscosity of the carboxylic acid moiety vs. To further assess the influence of the nature of oxygenated moieties on kinematic viscosity, compounds with 10 carbons and varying oxygenated moieties were investigated. The effect of dibenzothiophene, a sulfur-containing compound found in petrodiesel fuel, on viscosity of toluene is less than that of fatty esters or long-chain aliphatic hydrocarbons. The viscosity range of fatty compounds is greater than that of various hydrocarbons comprising petrodiesel. Free fatty acids or compounds with hydroxy groups possess significantly higher viscosity. Branching in the alcohol moiety does not significantly affect viscosity compared to straight-chain analogues. ![]() Terminal double bonds in aliphatic hydrocarbons have a comparatively small viscosity-reducing effect. The kinematic viscosity of unsaturated fatty compounds strongly depends on the nature and number of double bonds with double bond position affecting viscosity less. The increase in kinematic viscosity over a certain number of carbons is smaller in aliphatic hydrocarbons than in fatty compounds. Kinematic viscosity increases with chain length of either the fatty acid or alcohol moiety in a fatty ester or in an aliphatic hydrocarbon. ![]() The objective is to obtain a database on kinematic viscosity under identical conditions that can be used to define the influence of compound structure on kinematic viscosity. In this work, the kinematic viscosity of numerous fatty compounds as well as components of petrodiesel were determined at 40 ☌ (ASTM D445) as this is the temperature prescribed in biodiesel and petrodiesel standards. Ranges of acceptable kinematic viscosity are specified in various biodiesel and petrodiesel standards. One of the most important fuel properties of biodiesel and conventional diesel fuel derived from petroleum is viscosity, which is also an important property of lubricants. 1059-1065 Subject: sulfur, vegetable oil, viscosity, unsaturated fatty acids, animal fats and oils, kinematics, structure-activity relationships, fatty acid esters, biodiesel, temperature, toluene, alcohols Abstract: Biodiesel, defined as the mono-alkyl esters of vegetable oils and animal fats is an alternative diesel fuel that is steadily gaining attention and significance. Influence of compound structure and comparison to petrodiesel fuel components Author: Knothe, G., Steidley, K.R. Kinematic viscosity of biodiesel fuel components and related compounds.
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