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Zaprezentowana w artykule praca badawcza przedstawia symulacyjną analizę występowania przepływu wtórnego namywającego osad w kadzi wirowej. Przedmiotem analizy był przepływ w zbiornikach kadzi wirowej o kształtach występujących w konstrukcjach przemysłowych. Celem analizy było określenie wpływu zmiennych rozwiązań konstrukcyjnych kształtu takich zbiorników na warunki formowania i ewolucję przepływu wtórnego formującego stożek osadu.
Growing interest in functional and fermented beverages market is undeniable. Many traditional beverages find their customers in different markets, like kefir in the United States, water kefir in France or kombucha in Europe. In fermented beverages not only functional properties are found, but also technological issues, such as blowing bottles, over-carbonation, growing alcohol content and repellent flavor
Coffee is one of the most often consumed beverages. Despite its tradition and story, there are still innovations showing up on the market. Cold brew coffee is an innovative beverage and its dramatic growth in sales inspires more and more companies to have at least few cold brew coffees in its portfolio
The present paper is a literature survey focused on a specific kind of corrosion, i.e. pitting corrosion and its influence on fatigue of ship and offshore steels. Mechanisms of a short- and long-term pitting corrosion in marine environment have been described including pit nucleation and growth phases. Some models of pit growth versus time of exposure have been presented. Some factors which influence the pit growth rate have been discussed briefly
The present paper deals with the influence of pitting corrosion on mechanical properties of mild and low alloy steels and strength of steel structures under static and quasi-static loads. Pitting corrosion is a very important phenomenon that influence local strength of ship hull members. The present paper is based mainly on Japanese publications. Analyzing the standard tensile diagrams one can see that that pitting corrosion reduces the load corresponding to yield stress (YS) and, even more markedly, tensile strength UTS, reduces almost to zero plastic flow strains at YS load level and dramatically reduces the total elongation to fracture. Nominal UTS load for uniformly corroded specimens is higher than that for pitted specimens at the same average thickness loss. The strength related to the true fracture surface area (i.e. reduced by pits, taking into account real path of the crack through the pits) is almost independent of the thickness loss and is almost the same as for uniform thickness loss. For wide specimens the tensile strength depends mainly on the local deformation ability, and the maximum loading ability for large members, predicted on the base of the total true fracture surface area, can be overestimated. Concept of equivalent thickness loss for plates under bending and compression and for more complex structural models as well as relation between the average and the equivalent thickness losses has been presented. Approach based on degree of pitting (ratio of pitted area to total plate surface area) has been shown as a real and more convenient than the approach based on the thickness loss
The objective of the research project was to determine the correlation between the volume of tree crowns and the proportions of juvenile and mature wood in 8-meter long stem sections of Norway spruce (Picea abies Karst.). The performed experiments comprised 28 test trees selected from stands, which have grown in conditions of two forest site types: mixed mountain forest and mixed coniferous mountain forest.
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