<abstract xmlns="http://www.w3.org/1999/xhtml">

A computational fluid dynamics simulation is done for comparative study from the pumping effect on the four surfaces of the stirred tank. The flow field generated by one-stage and bi-stage six-bladed Rushton turbine in the unbaffled square tank was studied. The Reynolds-averaged Navier-Stokes equation with steady-state multi-reference frame approach (MRF) is used to simulate hydrodynamic flow in the tank. The turbulent viscosity, the turbulent kinetic energy and mean velocity distributions obtained in vertical and horizontal plans are analyzed and discussed. We can deduce that the additional Rushton turbine in the upper part of the square tank improves the quality of the mixture.
</abstract>

Department of Mechanical Engineering, Faculty of Mechanics

University of Sciences and Technology of Oran Mohamed Boudiaf (USTO-MB)

Laboratory of Electro-Mechanic Systems, (LASEM)

Hydrodynamic Comparative Study on the Pumping Effects of a Square Tank Equipped with Single-Stage and Bi-Stage Impellers

<abstract xmlns="http://www.w3.org/1999/xhtml">

Nanofluids contain nanometer-sized particles in suspension to enhance heat transfer by increasing the thermal conductivity. This paper provides an overview of particle size and volume fraction of nanofluids, and their roles in enhancing the heat transfer. Often, the transfer of heat is enhanced by dispersed particles with small diameter and high concentration despite some debate about the governing effects. The design of elliptical cross-section and zigzag tube also sheds insight into augmenting heat transfer for future research directions and applications.
</abstract>

Department of Chemical Engineering, Faculty of Chemical & Energy Engineering

Nanofluids in Zigzag Elliptical Tube Heat Exchanger: A Design Perspective

<abstract xmlns="http://www.w3.org/1999/xhtml">

Inconel738 is a nickel-based super alloy widely used in manufacturing gas turbines, particularly in the manufacture of blades that are in direct contact with hot gases during their operation. As a result, these blades are subjected to high temperatures, significant static and dynamic stresses, erosion and/or hot corrosion which can be very severe. The use of coatings is one of the most effective strategies to protect materials against corrosion and increase the wear resistance of materials. In this study, β-Ni-Al coatings were sprayed onto an Inconel738 substrate using a wire flame spraying process and characterization of coating has been made.
</abstract>

Experimental Investigation on the Coating of Nickel-Base Super Alloy Using Wire Flame Spraying

<abstract xmlns="http://www.w3.org/1999/xhtml">

Since about two decades, cellular phones coupled to internet and wireless communications are offering many possibilities that can be exploited by classical telerobotics to free human operators from many constraints providing mobility and ubiquitous applications.
This paper presents the design and implementation of an experimental telerobotics system where the human operator supervises and controls remote robots by means of cell phones. To achieve this application, we used Java software namely J2ME platform which is dedicated for programming cell phones and J2SE platform for programming PCs. The adopted software technology of connection between the human operator and the remote robots uses the socket technique with client-server model. The cell phone held by the operator acts as a Client while a PC, situated at the remote robot site, acts as a Server. This application corresponds to Midlet-to-Servlet in Java terminology. Basic simulations and preliminary experiments have been successfully carried out with a three Degrees-of-Freedom (D.O.F) serial robot. These telerobotics systems based on cell phones are effectively offering interesting means to opening new perspectives for mobile and ubiquitous applications.
</abstract>

Control of Remote Robots by Means of Cell Phones

<abstract xmlns="http://www.w3.org/1999/xhtml">

The paper presents a strategy of energy loss minimization within a hybrid energy storage system of an electrical vehicle, composed by a battery and a supercapacitor. The optimization of the power sharing between these energy storage devices is performed for the New European Driving Cycle, using the Particle Swarm Optimization algorithm. The minimum energy storage required to pass through the driving cycle is taken into account as a time-variable constraint during the optimization. The dimension of the search space increases with the dimension of the optimization vector, which has to be kept low in order to keep the complexity of the problem manageable. It is shown, that the subdivision, and piecewise optimization of the driving cycle improves the result by means of relaxation of the constraint represented by minimum level of the required energy storage.
</abstract>

Department of Electrical Machines and Drives, Faculty of Electrical Engineering

Department of Electrical Engineering, Faculty of Technical and Human Sciences

Sapientia-Hungarian University of Transylvania

Optimal Power Sharing Control of the Hybrid Energy Storage System of an Electric Vehicle Along a Standard Driving Cycle

AHEAD OF PRINT

Volume 15 (2023): Issue 1 (December 2023)

Volume 14 (2022): Issue 1 (December 2022)

Volume 13 (2021): Issue 1 (December 2021)

Volume 12 (2020): Issue 1 (December 2020)

Volume 11 (2019): Issue 1 (December 2019)

Volume 10 (2018): Issue 1 (December 2018)

Volume 9 (2017): Issue 1 (December 2017)

Volume 8 (2016): Issue 1 (December 2016)

Acta Universitatis Sapientiae, Electrical and Mechanical Engineering

 Series Acta Universitatis Sapientiae, Electrical and Mechanical Engineering surveys in various fields of Electrical and Mechanical Engineering. All papers are peer-reviewed. The language of the journal is English.  Why submit Strict review, open access, various fields covered.  Why subscribe and read Series Acta Universitatis Sapientiae, Electrical and Mechanical Engineering publishes only original papers and surveys in various fields of Electrical and Mechanical Engineering. All papers are peer reviewed. Rejection Rate   40%   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. 