Heat transfer in MHD Ekman layer on a porous plate

A steady asymptotic solution for the temperature distribution in the case of flow past a porous plate in a rotating frame of reference is obtained. In particular, the temperature distribution for MHD Ekman layer on a porous flat plate is studied. It is seen that, while a steady asymptotic solution is possible in case of suction, no steady temperature field is possible in case of blowing. Further, from the results it is observed that suction and magnetic field have opposing influence on the rate of heat transfer. © 1978 Società Italiana di Fisica

Retrofitting of a 420 kV draw-lead type bushing with a draw-rod type – Part I

On observation of deterioration of tan-δ value to 1.08 %, i.e., surpassing the limiting value of 0.7 % as defined in IEC60137 for the 420 kV OIP bushing for a 315 MVA, 400 / 220 / 33 kV transformer located at substation Katni (India), a decision was made to replace the bushing. The replacement was risky, and it was a threat of causing the catastrophic failure for the transformer itself and the colossal loss to the neighbouring equipment and structures

Corrosion and failure processes in high-level waste tanks

A large amount of radioactive waste has been stored safely at the Savannah River and Hanford sites over the past 46 years. The aim of this report is to review the experimental corrosion studies at Savannah River and Hanford with the intention of identifying the types and rates of corrosion encountered and indicate how these data contribute to tank failure predictions. The compositions of the High-Level Wastes, mild steels used in the construction of the waste tanks and degradation-modes particularly stress corrosion cracking and pitting are discussed. Current concerns at the Hanford Site are highlighted

Effect of nanocrystalline structure on the corrosion of a Fe20Cr alloy

The corrosion behaviour of nanocrystalline and microcrystalline Fe20Cr alloys, prepared by high energy ball milling followed by compaction and sintering, was studied in 0.05M H2SO4 and 0.05M H2SO4 + 0.5M NaCl by potentiodynamic polarization. The nanocrystalline alloy exhibited improved passivating ability and pitting resistance as described by passivation potential, critical current density, passive current density and breakdown potential. XPS and SIMS analysis revealed greater Cr content in the passive film formed on the nanocrystalline form of the alloy. The enhanced passivating ability of the nanocrystalline alloy was attributed to the formation of the passive film with higher Cr content