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A Mean Flow Model for Polymer and Fiber Turbulent Drag Reduction
We present a one-parameter model that fits quantitatively the mean velocity profiles from experiments and numerical simulations of drag-reduced wall-bounded flows of dilute solutions of polymers and non-Brownian fibers in the low and modest drag reduction regime. The model is based on a viscous mechanism of drag reduc…
Patents
Evaporation Blocker for Cone-Plate Rheometry of Volatile Samples
We report on the design and implementation of an evaporation blocker for cone-plate and plate-plate geometries. In addition to minimizing sample evaporation by trapping the saturated vapor inside a sample chamber, an important feature of the evaporation blocker is the suppression of solvent transport through condensat…
Non-Homogeneous Uncoupled Beam under Axially Distributed Loads
Editorial
Physics of Continuous Matter – Exotic and Everyday Phenomena in the Macroscopic World
The mechanism of changes in the surface layer of grey cast iron automotive brake disc
The aim of the study was to create a model, describing the run of tribological processes in the surface layer of grey cast iron automotive brake discs. Grey cast iron discs mating with non-asbestos organic brake pads were chosen for the investigations, as the most widely used materials in car brakes. Samples for surfa…
Operating characteristics of heavy loaded cylindrical journal bearing with variable axial profile
During the operation of turbounit its bearings displace as a result of heat elongation of bearings supports. It changes the static deflection line of rotor determined during assembly of the turbounit, causing an increase in the stresses on the bearing edges and a decrease in the dynamic state of the machine. One of po…
Theoretical and experimental study of carburisation and decarburisation of a meta-stable austenitic steel
Metastable austenitic stainless steels are known to undergo a partial transformation of austenite to martensite as a consequence of plastic deformation. In the case of cyclic loading, a certain level of plastic strain must be exceeded, and phase formation takes place after an incubation period, during which the necess…
Constant load creep data in air and vacuum on 2.25Cr-1Mo steel from 600 °C to 700 °C
Creep results on 2.25Cr-1Mo were obtained at 600 °C, 650 °C and 700 °C at five stress levels, under constant load, in air and vacuum. Two chambers were specially developed for carrying out creep testing in controlled environment, with the possibility of accommodating inside them the load train, the extensometry system…
TABLE OF CONTENTS
Surface processing to improve the fatigue resistance of advanced bar steels for automotive applications
With the development of new steels and processing techniques, there have been corresponding advances in the fatigue performance of automotive components. These advances have led to increased component life and smaller power transfer systems. New processing approaches to enhance the fatigue performance of steels are re…
Effect of alloy grain size on the high-temperature oxidation behavior of the austenitic steel TP 347
Generally, oxide scales formed on high Cr steels are multi-layered and the kinetics are strongly influenced by the alloy grain boundaries. In the present study, the oxidation behaviour of an austenite steel TP347 with different grain sizes was studied to identify the role of grain-boundaries in the oxidation process.…
Microstructural evaluation of rare-earth-zinc oxide-based varistor ceramics
Zinc oxide varistors are nonlinear voltage dependent ceramic resistors used to suppress and limit transient voltage surges. The work reported in this paper involves the relationship between microstructural characteristics and the varistor performance of ZnO ceramics doped with rare-earth oxides. Samples of these ceram…
High-temperature oxidation of pure Fe and the ferritic steel 2.25Cr1Mo
The global pressure for recycling and ecological energy production increases steadily in combination with the demand of cost-effective application of materials. However, some severe corrosion problems, associated with the high internal/intergranular corrosion rates in boiler components need to be avoid. Some commercia…
Production of a low young modulus titanium alloy by powder metallurgy
Titanium alloys have several advantages over ferrous and non-ferrous metallic materials, such as high strengthto-weight ratio and excellent corrosion resistance. A blended elemental titanium powder metallurgy process has been developed to offer low cost commercial products. The process employs hydride-dehydride (HDH)…
The effect of alloying on the resistance of carbon steel for oilfield applications to CO2 corrosion
A systematic study has been conducted to investigate the influence of a wide range of alloying elements and different processing conditions on the resistance of low-carbon steels to CO2 corrosion. Strong carbide-forming microalloying elements such as Ti, Nb and V, along with Cr additions, and different levels of Mn, S…
Editorial
Risks for the readymix concrete producer and contractor according to the acceptance or rejection criteria specified in different standards (part I)
The objective of the present work is the study and comparison of the criteria for conformity and acceptance of the EHE (1), EN206-I (2) and ACI 318 (3) series of standards, which are in use in Spain, the European Community, the US and many Latin-American countries. As such, the paper starts with a conceptual different…