Acta Mechanica Slovaca, 2024 (vol. 28), issue 2
A Numerical Study of the Innovative Design of Kinetic Static Mixer on Mixing Efficiency and Heat Transfer Improvement
Ourdia Benabdellaziz, Youcef Kamla, Ahmed Mouissi, Abdelkader Karas, Zied Driss
Acta Mechanica Slovaca 2024, 28(2):6-20 | DOI: 10.21496/ams.2024.008 
This paper investigates the influence of rheological and geometrical properties on flow structures generated within a KENIC static mixer. The primary objectives are to examine the impact of these factors on fluid flow characteristics, particularly low-pressure conditions and mixing efficiency. To exanimate the performances of the different shapes, several parameters have been considered which consist on mixing index, thermal mixing index, hydrodynamic behavior and the probability density function. The investigation extends to encompass both Newtonian and non-Newtonian fluids, emphasizing Reynolds numbers ranging from 10 to 80. Comparative analyses...
Impact of Casting Speed on Low Carbon Steel Manufacturing Process
Luboš Polcar, Marek Velička, Jan Růžička, Arasappan Yesudass
Acta Mechanica Slovaca 2024, 28(2):22-27 | DOI: 10.21496/ams.2024.013
Presented paper is focused on research of low carbon steel behaviour during continuous casting process. Research was conducted to investigate optimization opportunity of current casting process and possibility of increase in casting speed. Research was focused mainly on primary cooling area which is represented by mould. Mould insert was drilled, and thermocouples were installed in centreline of each side. Among others also temperatures and flow of cooling water, mould insert temperature and surface temperature of billet on the exit from the mould were measured. From conducted research it can be concluded that all following values exhibit strong linear...
Modelling of Pulsed Flow Effects Through the Exhaust System of a Turbocharged Engine Using Mixed Flow Turbine
Djamel Mazari, Mustapha Bordjane, Mohammed Hamel, Khadidja Boualem
Acta Mechanica Slovaca 2024, 28(2):28-43 | DOI: 10.21496/ams.2024.007
For some decades, reductions of fuel consumption and pollutant emission control have become the first requirement for internal combustion engines. Turbocharging is a promising way among many techniques to solve this problem since it leads to a downsized, lighter and more compact engine. Two important novelties can be listed in this study, the first is the development of a thermodynamic (zero dimensional) model for the gas expansion process through the exhaust system of turbocharged internal combustion engines. The latter is used to setup the unsteady state analysis using interpolation function for cyclic time of the internal combustion engine and the...
Metamaterials and Their Application in Biomedical Engineering
Barbara Schürger, Peter Frankovský, Ingrid Delyová, Jozef Živčák, Sára Janigová
Acta Mechanica Slovaca 2024, 28(2):44-50 | DOI: 10.21496/ams.2024.016
Mechanical metamaterials have attracted attention due to their unique mechanical properties, such as low weight, adjustable stiffness, and auxeticity, making them excellent candidates for biomedical engineering innovative applications such as bone implants, vascular stents, and other healthcare applications. In this review, we will focus on the mechanical properties and behavior of these materials under different conditions, focusing on their application in the field of biomedical engineering.
Conceptual Design of a Bioreactor for Tissue Engineering and Regenerative Medicine
Petra Kolembusová, Norbet Ferenčík, Radovan Hudák
Acta Mechanica Slovaca 2024, 28(2):52-60 | DOI: 10.21496/ams.2024.030
The aim of the paper was to make an overview of current bioreactor systems in tissue engineering and introduces a conceptual design for a perfusion bioreactor tailored for vascular tissue culture. Perfusion bioreactors were selected for their ability to replicate the in vivo environment, particularly for blood vessels, by providing continuous media flow and applying shear stress, both critical for successful vascular tissue growth. Three bioreactor variants were designed, each incorporating specific modifications aimed at improving the tissue culture process. Variant A consists of a cylindrical chamber that allows for uniform external media flow. Variant...
Analysis of the Relationship Between the Motion Resistive Force and the Road Surface for Special Purpose Off-Road Vehicle
Marek Nowakowski, Przemyslaw Siminski, Krzysztof Kosiuczenko
Acta Mechanica Slovaca 2024, 28(2):62-66 | DOI: 10.21496/ams.2024.010
A comprehensive understanding of the relationship between motion resistive force and road surface is essential for operation of special purpose off-road vehicles. This research focuses on the testing of a developed Light Terrain Vehicle (LST). Design of LST special vehicle as well as used equipment for testing purposed is descried. The paper presents carried out testes on typical road surfaces closely related to the operational conditions. The study enables defining operational usage of developed special purpose off-road vehicle in diverse environments.
Three-dimensional Bioprinting with the Use of Induced Pluripotent Stem Cells in Regenerative Medicine
Jana Demeterová, Marianna Trebuňová, Darina Bačenková
Acta Mechanica Slovaca 2024, 28(2):68-74 | DOI: 10.21496/ams.2024.019
The field of regenerative medicine has witnessed significant advancements in recent years due to the emergence of three-dimensional (3D) bioprinting technology. One promising approach is the utilization of induced pluripotent stem cells (iPSCs) as a cell source for bioprinting, allowing for the construction of complex tissue structures. iPSCs hold immense potential as they can be derived from a patient's own cells, enabling personalized therapies, and eliminating the risk of immune rejection. The integration of iPSCs with 3D bioprinting technology expands the possibilities of regenerating damaged tissues and organs. iPSCs can be programmed to differentiate...
Angled G-Code Generator for Robotics Additive Manufacturing
Pavol Štefčák, Ivan Gajdoš, Ján Slota, Lukasz Sobaszek
Acta Mechanica Slovaca 2024, 28(2):76-82 | DOI: 10.21496/ams.2024.022
The current state of the utilization of robotic arms in large-scale additive manufacturing (AM) has spurred the development of new hardware and software solutions stemming from the need to reduce the cost of preprocessing and production itself. The use of 6 degrees of freedom combined with the proper software solution for generating the machine motion paths can largely save the time and material required for production of the large-format products. Although several studies have been carried out in this area outlining the possibilities of generating non-planar layers exploiting the potential of 4 or more degrees of freedom all these studies have been...