Thermophysical properties of automotive fluids have become increasingly important in designing advanced automotive systems and components. By controlling the thermophysical properties of automotive fluids, the thermal management of automotive systems can be better controlled. The temperature dependence of thermal conductivity, specific heat capacity, density, and kinematic viscosity have been studied in detail for a range of oils and coolants used in automotive systems. Engineering properties, such as Prandlt and Nusselt numbers, were calculated from the measured thermophysical properties and are compared for the fluids studied. Finally, the importance of vapor pressure and surface tension measurements are discussed as means for assessing fluid behavior effects in systems and for fluid formulation development. The study indicates that the combined effects for each of these measured factors and their temperature dependence, are crucial in quantifying the overall heat transfer and thermal management of automotive systems. Reliable thermophysical properties are not generally available for existing automotive fluids and certainly are not available for new fluids under development. Therefore good characterization tools are critical for understanding and controlling thermophysical properties during the development of next-generation automotive fluids. In this work, the four major factors have been shown which are used to describe the thermophysical properties of a broad range of automotive fluids, including oils and coolants over a broad range of temperature varying between -20 deg C and 120 deg C.
Thermophysical characterization of automotive fluids
Thermophysikalische Kennzeichnung von Kraftfahrzeugfluiden
2006
11 Seiten, 8 Bilder, 1 Tabelle, 37 Quellen
Conference paper
English
Thermophysical Characterization of Automotive Fluids
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