Secondary flow visualization on stagnation row of a combined impingement and film cooled high-pressure gas turbine nozzle guide vane using PIV technique
In this study, the local jet velocity distribution for a combined impingement and film cooled high-pressure nozzle guide vane system was analyzed, using flow visualization and PIV-assisted measurement. The measurements including flow visualization were performed on the stagnation row of an NGV to understand its complex flow pattern. PIV technique was used to measure the effused coolant jet exit velocity field in two-dimensional vertical planes. The computations were performed by ANSYS FLUENT 14.5 SOLVER using shear stress transport (SST) k-ω turbulence model. Three laboratory test cases that correspond to inlet coolant mass flow rates of 0.0032, 0.0045 and 0.0054 kg/s, at the region of an FIT, were studied. The numerical results for the spanwise coolant velocity at stagnation row of the film holes agreed well with the PIV experimental data on the same vane configuration.Graphical Abstract
Visualization of heat transfer from arrays of impinging jets
Abstract A visualization technique is used to measure the heat transfer coefficient distribution on a flat plate on which either a single jet or an array of jets impinges. Liquid crystals coated on a mylar sheet are used to locate isotherms on a heated surface. By adjusting the surface heat flux, contours of constant heat transfer coefficient are obtained.
Between identity and difference: Three ways of reading Nishida's non-dualism
The philosophy of Nishida KitarŌ offers the reader today not only a paradigm for a comparative philosophy, but also a methodological framework to construct a Buddhist philosophy. The key and, at the same time, the obstacle to his philosophy is the concept of the "self-identity of the absolute contradiction." This conceptual cornerstone of Nishida's philosophy is as controversial among scholars today as it is central to his philosophy. Critics, such as Tanabe Hajime and Takahashi Satomi, argue that Nishida's philosophy privileges the principle of identity over that of difference and falls into a monism; his supporters, most of all Nishitani Keiji and Ueda Shizuteru, to the contrary, claim that it comprises the key to philosophical non-dualism. In general, I am convinced that even his "self-identity of the absolute contradiction," if it is read carefully within the context of Nishida's philosophy, will render a paradigm that falls neither into a logical contradiction nor into a monism but that provides the foundation for a non-dualist philosophy. To this end, I will reread it first in the context of Nishida's overall project and, then, on the background of Nishida's debates with his critics.