Synthetic Turbulence Modeling for Evaluation of Ultrasonic Cross-Correlation Flow Measurement

The file attached to this record is the author's final peer reviewed version. The Publisher's final version can be found by following the DOI linkPerformance of an ultrasonic cross-correlation flow measurement instrument may be significantly affected by turbulence at the location of the ultrasonic sensors. In this paper, a new method of generating Synthetic Turbulence is presented, to provide an effective tool for creating a variety of turbulent fields, which can be used to model and analyze instrument performance under different flow conditions. In the proposed method, a turbulent field is presented as a Fourier time-series in each point in space. Turbulence structures are defined by a spatial distribution of phase functions for each harmonic. Principles of designing a phase function to achieve the desirable distribution of turbulence scales, and two-point correlations, are outlined by considering the example of Uniform Isotropic Turbulence. One application of this method, presented in this work, is the mathematical modeling of ultrasonic cross-correlation flow measurement. Results predicted by the proposed mathematical model show good agreement with experimental data

Influence of recombination on the thermal conduction in bipolar semiconductors and semiconductor structures

Paper presented to the 10th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Florida, 14-16 July 2014.It is investigated the influence of recombination on the energy flux in bipolar semiconductors. The expression for energy flux in a nondegenerate semiconductor in a linear approximation with respect to perturbation in a quasi-neutral approximation taking into account recombination (the presence of nonequilibrium charge carriers in the semiconductor) has been obtained. In a one-dimension case when the different temperatures from the both sides of the semiconductor have been considered the energy flux density has been calculated in two different cases: the case of weak recombination and the case of strong recombination.cf201

Analysis of phase equilibria in Ni-Ti-C system in high nickel regions

Translated from Russian (Izv. Vyssh. Uchebn. Zaved., Chern. Metall. 1987 (1) p. 6-10)SIGLEAvailable from British Library Document Supply Centre- DSC:5828.4(M--37304)T / BLDSC - British Library Document Supply CentreGBUnited Kingdo