International Journal of


TFEME Journal                                                                                                                                                ISSN: 2831-0527


Naslovnica, Volume 2

All manuscripts should be submitted through the TFEME Journal online submission system to  June 28, 2024.

Submissions should follow the manuscript format guidelines for the TFEME Journal.

To ensure that all manuscripts are correctly identified  it is important to select type when you reach the “Article Type” step in the submission process.

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Vol. 2. No.1. (2024)

In Press, Journal Pre-proof, Available online 22 July 2024

Research articleAbstract only

Heat energy generated during friction stir welding influences the joint geometry

Darko Veljic,, Bojan Medjo, Darko Bajic, Nenad Radovic   



This study deals with the analysis of heat generation components (stemming from friction and plastic deformation) and reaction force in vertical direction during the plunge stage of the friction stir welding. Influence of the joint geometry is determined on butt joints and T-joints fabricated from the same material, high strength Al alloy; on the example of the T-joint, different tool rotation speeds and tool pin lengths are considered.

The material temperature in the root of the weld below the tool pin is lower in the T-joint than in the butt joint, due to the efficient transfer of the generated heat energy through the vertical plate (stringer). The reaction force is higher for the T-joint than for the butt joint; as a consequence, heat generation by friction is more pronounced in comparison with the heat generation by plastic deformation. The reaction force is somewhat lower for the tool with shorter pin, which increases both components of the generated heat. Increase of the tool rotation speed decreases the resistance to the tool plunging into the T-joint, which decreases the friction-generated heat and increases the amount of heat generated by plastic deformation.

In Press, Journal Pre-proof, Available online 

Research articleAbstract only

The external irreversibility within finned two sections heating channel: Analytical approach

Fikret Alic


During fluid flow through profiled convective channels, thermal and hydraulic irreversibilities occur simultaneously in different mutual ratios. The quantitative ratio of these irreversibilities depends on each case, and the value of this ratio can be many times higher than one. Forced air flow and heating of the fluid are established in the finned profiled channel, which consists of two axisymmetric and geometrically identical sections. The entire profiled housing is thermally insulated from the environment. The central heating element of constant heat flux simultaneously heats the longitudinal fins at their bottom. The total external entropy of the air in the inlet and outlet convective channel consists of the thermal and hydraulic. The total internal entropy includes only the thermal entropy, caused by the heat load of the fins and inter-fin surfaces in both sections. The relationship between entransy flow dissipation ratio and thermal entropy is analyzed using the new irreversibility ratio. The established mathematical model represents the basis for optimizing the geometric and process parameters of the analyzed heating system.

In Press, Journal Pre-proof, Available online 22 July 2024

Research articleAbstract only

Possibilities of using dissipative heat during infrared heating - Combined approach

*Darko Veljic, Bojan Medjo, Dragana Mihajlovic, Fikret Alic 


This work contains a brief overview of the application of infrared heaters in different industry branches and a new solution of a modular heating device with the nanofluid collector for efficient and optimal usage of the infrared heat/energy. The system comprises two functional sub-systems. The first one contains one or more detachable infrared heating elements which jointly represent an infrared heat source with appropriate power, spatial and geometry configuration. The second sub-system contains one or more nanofluid collectors positioned in the vicinity of the first subsystem with a heat source. The aim is to accumulate or utilise the emitted thermal radiation which does not reach the heated body, as well as the portion of the infrared energy emitted from the top side of the heaters. Different types of the modular heating devices with nanofluid collectors will have different fields of application, such as: heating of indoor spaces, drying, thermal treatment during the painting (e.g. in car paint shops), heating of outdoor spaces, thermal treatment of different products, in food industry (e.g. baking), agriculture, etc. 

In Press, Journal Pre-proof, Available online 22 July 2024

Research articleAbstract only



Vol. 1. No 1. (2022)

Energy Efficiency of the Novel Adaptive In-Line Process Electric Heaters

Fikret Alić

Experimental and Artificial Neural Network Investigation on the Thermal Efficiency of Two-Phase Closed Thermosyphon

Engin Gedik, Hüseyin Kurt, Murat Pala, Abdulla Alakour, Metin Kaya

Thermo-hydraulic Performance Analysis of Al2O3/water Nanofluid Flow in a Tube Extended by Twisted Tape

Emrehan Gürsoy, Ezgi Çalar, Abdullah Dağdeviren, Hayati Kadir Pazarlıoğlu, Engin Gedik, Kamil Arslan

Importance of nanofluid evaluations at identical velocity and pumping power: a specific evaluation for Ag-MgO/water hybrid nanofluid flow through a pipe under turbulent regime

Huseyin Kaya, Volkan Akgul, Cuneyt Uysal

Mathematical modelling of moisture sorption isotherms of some fruits

Vangelce Mitrevski, Cvetanka Mitrevska


TFEME (ISSN 2831-0527) is an open access journal and publishes papers on scientific research, technology development, engineering policy, and management studies related to the general field of energy, from technologies of energy supply, conversion, dispatch, and final use to the physical and chemical processes behind such technologies. Acceptable paper types are reviews, regular research papers, and communications. Original, innovative and novel contributions providing insight into the use of analytical, computational modelling as well as experimental research results are encouraged. There is no restriction on the length of the papers.