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The paper presents analysis of thermal properties of natural ester modified by nanoparticles C60 and TiO2, used in power transformers. The measurements of thermal properties, such as thermal conductivity, kinematic viscosity, specific heat, density, and thermal expansion were carried out. Measurements were carried out at a temperature of 25 °C, 40 °C, 60 °C and 80 °C. On the basis of measurement results,...
The heat transfer characteristics are experimentally investigated when a droplet train impinges onto a heated surface. A steady-state experimental method is applied to measure the heat transfer coefficient continuously. The boiling regime, transition of the splashing regime, and post-transition regime can be observed. The hydrodynamic pattern significantly changes with an increase of wall temperature...
Since the higher function and miniaturized electronic devices need to consume more energy, the heat flux of local area in device will be more than 1000 w/cm2 to cause the concern of heat transfer. This paper studied the heat transfer of air-water two-phase flow in microgap with non-boiling conditions. When the flow rate of DI water was fixed (32∼196 ml/min), Nusselt number increased higher with the...
The dual phase model for thermal conduction has been applied to transient measurement of a human tissue. The dual phase thermal conduction is closely related to the non Fourier thermal conduction due to the wave properties of the equation.
This study contributes to a better understanding of condensation heat transfer in horizontal non-circular micro-condenser. For this purpose, the experimental investigations of a two-phase flow were conducted to study various flow patterns and coalescence phenomena of steam condensation in rectangular microchannel with hydraulic diameter of 305μm (depth of 310μm and width of 300μm). Local surface temperatures...
The effect of the type and quality of process models applied for fault detection and isolation is investigated in this paper. It is shown that the level of details and the modelled processes within the applied grey box model determine the detectability of the faults as well as the sensitivity and detection delay of a particular fault detection method. The concepts and results are illustrated on the...
We report a micro- and nano-machined surface cavity on which boiling nucleation resumes after ceasing in perfluorohexane (i.e., FC-72, a Fluorinert™ from 3M™) for a short time. To the best of our knowledge, this is the first such success with FC-72, which has the lowest surface tension of all available liquids and completely wets any existing material including Teflon® so that all surface cavities...
Arrays of impinging jets can cool large areas with good thermal uniformity and are often used in industrial processes, such as drying and electronics cooling. However, due to cross-flow of the spent liquid and interference between adjacent jets, a significant amount of the available cooling performance is lost. Under free-surface jet impingement the area beyond the hydraulic jump is associated with...
A double-loop thermosyphon for cooling electric components is presented. It consists of two loop thermosyphons in series, both driven by gravity. The evaporator of the first loop is in contact with the heating blocks providing the power. The condenser of the first loop thermosyphon comprises a heat exchanger plate, in close contact with a second heat exchanger plate serving as evaporator for the second...
A new heat transfer method, which combines the merits of liquid jet impingement heat transfer with metallic porous surfaces, is proposed. The porous surface was made by sintering a single layer or multiple layers of copper wire mesh screen to a plain copper base heat transfer surface. Experiments were conducted with a 2.0-mm diameter circular water jet impinging onto a 6.35-mm diameter circular porous...
In process control involving energy balances the heat capacity of the process fluid is needed. Although many methods for accurate heat capacity measurements are available for the laboratory, an instrument for online heat capacity measurement has yet to be developed. This paper presents such a method of online heat capacity measurement. The method is optimized with respect to the design, and a preliminary...
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