Showing papers by "Richard J Goldstein published in 2005"
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TL;DR: In this paper, the authors present an analytical/numerical method and modelling/simulation techniques for contact conduction/contact resistance. But they do not consider the non-Fourier effects and laser/pulse heating in complex geometries, composites/layered media and fins.
35 citations
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TL;DR: In this paper, the authors compared the Sherwood number distributions on an endwall with a simple blade and a similar blade having modified leading-edge by adding a fillet, and found that the fillet increased the mass transfer region near the leading edge.
Abstract: The secondary flows, including passage and other vortices in a turbine cascade cause significant aerodynamic losses and thermal gradients. Leading-edge modification of the blade has drawn considerable attention as it has been shown to reduce the secondary flows. However, the heat transfer performance of a leading-edge modified blade has not been investigated thoroughly. Since a fillet at the leading edge blade is reported to reduce the aerodynamic loss significantly, the naphthalene sublimation technique with a fillet geometry is used to study local heat (mass) transfer performance in a simulated turbine cascade. The present paper compares Sherwood number distributions on an endwall with a simple blade and a similar blade having modified leading-edge by adding a fillet. With the modified blades, a horseshoe vortex is not observed and the passage vortex is delayed or not observed for different turbulence intensities. However, near the blade trailing edge the passage vortex has gained as much strength as with the simple blade for low turbulence intensity. Near the leading edge on the pressure and the suction surface, higher mass transfer regions are observed with the fillets. Apparently the corner vortices are intensified with the leading-edge modified blade.Copyright © 2005 by ASME
31 citations
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TL;DR: In this article, the authors used the naphthalene sublimation technique to investigate the development of Taylor-Gortler vortices over the pressure surface of a simulated high performance turbine blade.
Abstract: The naphthalene sublimation technique is used to investigate the development of Taylor-Gortler vortices over the pressure surface of a simulated high performance turbine blade. Large spanwise variation in mass transfer is observed downstream on the pressure surface in the two-dimensional flow region for cases with low freestream turbulence, indicating the existence of Taylor-Gortler vortices. Different average and local mass transfer rates for the same flow conditions suggest that roughness variation near the leading edge affects the initial formation of Taylor-Gortler vortices. Larger and more uniformly distributed roughness at the leading edge produces much stronger Taylor-Gortler vortices downstream and greatly enhances the mass transfer rate.
9 citations
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TL;DR: An electrochemical technique was used to study local mass transfer coefficients on surfaces of inclined enclosures over the range 1.1×104 < RaH < 1.4×1010 for a nominal Schmidt number of 2280 as mentioned in this paper.
Abstract: An electrochemical technique is used to study local mass transfer coefficients on surfaces of inclined enclosures over the range 1.1×104 < RaH < 1.4×1010 for a nominal Schmidt number of 2280. Scaling with gcosθ instead of g in the Rayleigh number correlates the data well at low angles of inclination; however, as either the aspect ratio or the angle of inclination increase, the longitudinal density stratification causes the data to deviate from a power law scaling.
4 citations