...Pedro J. Coelho Theoretical analysis and experimental investigations have shown that the mean heat fluxes in turbulent gaseous flows are influenced not only by the mean scalar fields (temperature and molar fraction of the species) but also by the scalar fluctuations. It is widely recognized...

... of Maxwell’s equations with the fluctuation-dissipation theorem to directly calculate the emissivity. The present study aims at unifying the direct and indirect methods for calculating the far-field thermal emission from layered structures with a nonuniform temperature distribution. Formulations for both...

... on the hot and cold walls are obtained by time-averaging the fluctuations in local heat flux. The effects of key experimental parameters, such as the camera frame rate and the total image capture time, are investigated. For the current problem, it is shown that a total capture interval of about 10 s...

...James S. Hammonds, Jr. A Green function approach is used with the fluctuation-dissipation theorem to develop a qualitative theoretical model of radiation heat transfer across an evacuated microscale spherical geometry bounded by silicon carbide. The appropriate scalar Green function is presented...

... crossflows within the windowed test section of a water channel facility. Mean and fluctuating concentrations of source fluid were measured over cross sections of the flow using planar-laser-induced-fluorescence (PLIF). The self-preserving penetration properties of the flow were correlated successfully...

... 18, 2003. Associate Editor: S. T. Thynell. 31 October 2003 18 April 2003 23 09 2003 turbulence fluctuations heat transfer radiative transfer temperature distribution flames flow simulation Combustion Heat Transfer Jets Radiation Turbulence...

... , however, significantly higher temperatures can be observed for the flames with the higher Reynolds number. For all the piloted flames, the normalized temperature fluctuations reach their peak values at a radial location away from the flame axis. 3 Temperature distributions in flames C (circle), D...

...Y. Feng; J. Seyed-Yagoobi The mechanism of heat transfer enhancement and pressure drop penalty in the presence of a radial electric field for the two-phase (liquid/vapor) annular flow is presented. The turbulence spectral theory shows that the radial electric field fluctuation changes the turbulent...

...Erick A. Siba; M. Ganesa-Pillai; Kendall T. Harris; A. Haji-Sheikh This study concerns the flow and heat transfer characteristics of a turbulent submerged circular air jet impinging on a horizontal flat surface when free stream turbulence exceeds 20 percent. The turbulent fluctuations of the free...

... line heat transfer. A new correlation for the stagnation line heat transfer has been developed that includes the spanwise fluctuating vorticity components. Contributed by the Heat Transfer Division for publication in the JOURNAL OF HEAT TRANSFER . Manuscript received by the Heat Transfer...

...-mean-square temperature fluctuations and turbulent heat fluxes were verified with existing DNS studies obtained with ideal thermal boundary conditions. Results of the present study were compared to the findings of Polyakov (1974), who made a similar study with linearization of the fluid equations...

...A. Mosyak; E. Pogrebnyak; G. Hetsroni, Fellow ASME An experimental study of the wall temperature fluctuations under different thermal-wall boundary conditions was carried out. Statistics obtained from the experiments are compared with existing experimental and numerical data. The wall temperature...

... fluctuation variable Permanent address: Department of Mechanical and Materials Engineering, University of Western Ontario, London, Ontario N6A 5B9, Canada. To whom correspondence should be addressed. Magnussen, B. F., and Hjertager, B. H., 1976, “On Mathematical Models...