Thermophysical properties of transformer and turbine oils

Mamedov, F. F.; Kuliev, F. A.; Azizov, A. G.

doi:10.1007/bf02694099

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“…The coefficient of thermal conductivity, λ a , and heat capacity, C a , at constant pressure were determined from the following relations assuming the additivity rule: Table 3 Values of densities ρ a , coefficients of thermal expansion, γ a and γ f , coefficients of thermal conductivity, λ a and λ f [10], and heat capacities, C a and C f [10], for magnetite/oleic acid aggregates and carrier liquid where…”

Section: Resultsmentioning

confidence: 99%

Temperature Dependence of Particle Size Distribution in Transformer Oil-Based Ferrofluid

2010

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The temperature dependence of the particle size distribution (PSD) of a transformer oil-based ferrofluid was studied using an ultrasound method. The measurements of the ultrasound velocity and attenuation were carried out in the absence of an external magnetic field as a function of the volume concentration of magnetite particles at temperatures ranging from 10 • C to 80 • C. The experimental results of ultrasound measurements were analyzed within the framework of the Vinogradov-Isakovich theory which takes into account contributions to acoustical parameters due to friction and heat exchange between magnetic particles and the surrounding carrier liquid. From the best fit of the experimental results and theoretical predictions, the parameters characterizing the PSD at different temperatures were determined. In order to analyze ultrasonic data, the density and viscosity of ferrofluid samples and the transformer oil were also measured.

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Section: Resultsmentioning

confidence: 99%