<abstract xmlns="http://www.w3.org/1999/xhtml">The article describes the theory of cavitation at high values of shear stress in a viscous liquid. For this purpose, a spatial model of two cylindrical shells imposed concentrically was designed. In the narrow gap between the cylinders the temperature, density and viscosity of liquid is constant. Shear stress is induced by the rotary motion of the inner cylinder, resulting in a change of velocity and pressure fields. Due to the pressure drop between the cylinders there is a precondition to the formation of cavitation bubbles at the point of the lowest static pressure. To verify the assumption was made CFD model based on simplified physical model, through which cavitation was qualitatively and quantitatively assessed. In this paper the results of the numerical solution will be presented alongside with basic form of experimental device for physical generation of cavitation at high values of shear stress.</abstract>

Research of Cavitation at High Shear Stress

<abstract xmlns="http://www.w3.org/1999/xhtml">The main aim of the presented paper is to show how heat treatment, in our case the induction hardening, will affect the wear rates as well as the ratcheting evolution process beneath the contact surface in the field of line rolling contact. Used wear model is based on shear band cracking mechanism [1] and non-linear kinematic and isotropic hardening rule of Chaboche and Lemaitre. The entire numerical simulations have been realized in the C# programming language. Results from numerical simulations are subsequently compared with experimental data.</abstract>

VSB-Technical University of Ostrava, Faculty of Mechanical Engineering, Department of Applied Mechanics, 17.listopadu 15, Ostrava, 17. listopadu 15/2127, 708 33 Ostrava-Poruba, Czech Republic

Influence of Induction Hardening on Wear Resistance in Case of Rolling Contact

<abstract xmlns="http://www.w3.org/1999/xhtml">The present study emphasizes on joints two industrially important materials AISI 304 with AISI 1021steels, produced by friction welding have been investigated. Samples were welded under different axial pressures ranging from 75MPa to 135MPa, at constant speed of 920rpm. The tensile strength, torsional strength, impact strength and micro hardness values of the weldments were determined and evaluated. Simultaneously the fractrography of the tensile tested specimens were carried out, so as to understand the failure analysis. It was observed that improved mechanical properties were noticed at higher axial pressures. Ductile failures of weldments were also observed at 120MPa and 135MPa axial pressures during fractography analysis.</abstract>

Professor, Department of Mechanical Engineering, RIMT University, Mandi Gobindgarh (Punjab) India.

Professor, Department of Mechanical Engineering, Ferozepur College of Engineering and Technology, Ferozshah (Punjab) India.

Experimental Evaluation of Mechanical Properties of Friction Welded Dissimilar Steels under Varying Axial Pressures

<abstract xmlns="http://www.w3.org/1999/xhtml">The article discusses the application of synthesis gas from pyrolysis of plastics in petrol engine. The appropriate experimental measurements were performed on a combustion engine LGW 702 designated for micro-cogeneration unit. The power parameters, economic parameters in term of brake specific fuel consumption, and internal parameters of the engine were compared to the engine running on the reference fuel - natural gas and synthesis gas. Burning synthesis gas leads to decreased performance by about 5% and to increased mass hourly consumption by 120 %. In terms of burning, synthesis gas has similar properties as natural gas. Compared with [5] a more detailed study has been prepared on the effects of angle of spark advance on the engine torque, giving more detailed assessment of engine cycle variability and considering specification of start and end of combustion in the logarithm p-V diagram.</abstract>

Slovak University of Technology in Bratislava, Faculty of Mechanical Engineering, Institute of Transport Technology and Engineering Design, Námestie slobody 17, 812 31 Bratislava, Slovakia

Enmon, a. s., Robotnícka 14/9856, 036 01 Martin, Slovakia

Internal Combustion Engine Powered by Synthesis Gas from Pyrolysed Plastics

<abstract xmlns="http://www.w3.org/1999/xhtml">Friction Stir Welding (FSW) is one of the most effective solid state joining processes and it has numerous potential applications in many industries. The simulation process can provide the evolution of physical quantities such as temperature, metallurgical phase proportions, stress and strain which can be easily measured during welding. The numerical modelling requires the modelling of a complex interaction between thermal, metallurgical and mechanical phenomena. The aim of this paper is to describe the thermal-fluid simulation of FSW using the finite element method. In the theoretical part of the paper heating is provided by the material flow and contact condition between the tool and the welded material. The thermal-fluid results from the numerical simulation for aluminium alloy using SYSWELD are also presented in this paper.</abstract>

FSW Numerical Simulation of Aluminium Plates by Sysweld - Part I

<abstract xmlns="http://www.w3.org/1999/xhtml">In this work we studied the influence of the fluid injection configuration (OIG: outside-in-gas, OIL: outside-in-liquid) on the internal flows and external sprays parameters. We sprayed the viscous aqueous maltodextrin solutions (μ = 60 mPa·s) at a constant inlet pressure of the gas and the gas to the liquid mass flow ratio (GLR) within the range 2.5 to 20%. We found that the fluids injection has a crucial influence on the internal flows. The internal flows patterns for the OIG atomizer were the slug flows, the internal flow of the OIL device was annular which led to the significant improvement of the spray quality: Smaller droplets, faster atomization, fewer pulsations.</abstract>

Comparison of the Viscous Liquids Spraying by the OIG and the Oil Configurations of an Effervescent Atomizer at Low Inlet Pressures

<abstract xmlns="http://www.w3.org/1999/xhtml">This paper focuses on the characterization of the tabletting process and analysis one of the most common pharmaceutical excipients MCC Avicel PH102 by Heckel, Kawakita, Cooper-Eaton and Adams compaction equations. Experimental material was determined by measuring its parameters as particle size distribution, angle of wall friction and flow properties and for more detailed characteristics of the material particles, microscopy images of the powder before and after compressing were created.</abstract>

Slovak University of Technology in Bratislava, Faculty of Mechanical Engineering, Institute of Process Engineering, Nám. Slobody 17, 812 31 Bratislava, Slovakia

Slovak University of Technology in Bratislava, Faculty of Mechanical Engineering, Institute of Technologies and Materials, Pionierska 15,831 02 Bratislava, Slovakia

Analysis of Pharmaceutical Excipient MCC Avicel PH102 Using Compaction Equations

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Strojnícky časopis - Journal of Mechanical Engineering

 The Strojnícky časopis – Journal of Mechanical Engineering publishesoriginal scientific and application oriented papers, dealing withproblems of modern technologies in the fields of mechanicalengineering including:   structural and solid mechanics,  fluid mechanics,  mechatronics,  multi-physical problems,  biomedical engineering,  advanced micro and nano materials,  structural and machine design,  virtual and rapid protyping,  power and process engineering,  strength of materials, creep, plasticity,  fracture mechanics and fatigue,  durability and reliability of engineering structures,  production engineering, etc.   This considers the following activities in mechanical engineering andcross-linked branches as modelling, simulations, experiment,construction, testing, measuring, operation, production, environmentalaspects, quality, etc.  The Strojnícky časopis – Journal of Mechanical Engineering publishesthe following types of papers:   Regular Articles should describe original research of highquality or new application in the field of Mechanical Engineering.  Review Articles will generally be specially commissioned,however, suggestions for topics and authors are welcomed by theEditor-in-Chief.  Technical Notes provide rapid publication of important newcontributions.   Please see our Guide for Authors for information on articlesubmission. If you require any further information or help, please donot hesitate to contact us.  The submitted papers are peer-reviewed and tested against plagiarism.  The journal does not have article processing charges (APCs) norarticle submission charges.  Archiving  Sciendo archives the contents of this journal in Portico - digital long-term preservation service of scholarly books, journals and collections.  Plagiarism Policy  The editorial board is participating in a growing community of Similarity Check System's users in order to ensure that the content published is original and trustworthy. Similarity Check is a medium that allows for comprehensive manuscripts screening, aimed to eliminate plagiarism and provide a high standard and quality peer-review process. 