Kielce University of Technology
Kielce, Poland

The Kielce University of Technology is a relatively young institution, although the traditions of higher education in Kielce go back to the beginning of the 19th century. It was here that Stanisław Staszic founded the Mining Academy, one of the first higher schools in Poland, which operated in the years 1816–1826 and provided qualified personnel to meet the needs of the Old Polish Industrial Basin. Higher education became available in Kielce again in 1965 when Kielce-Radom Evening Higher Engineering School was established. It was transformed into the Kielce University of Technology in 1974.The University has four faculties: Civil and Environmental Engineering, Electrical and Computer Engineering, Mechatronics and Machinery Design, Management and Computer Modelling.At present, over 9,400 students take courses in seven fields of studies: Civil Engineering, Environmental Engineering, Electrical Engineering, Computer Science, Mechanics and Machinery Design, Management and Marketing, Management and Production Engineering. The University is entitled to award a Doctor's degree in five academic disciplines: civil engineering, environmental engineering, electrical engineering, machine building and operation, mechanics, and a degree of Doctor Habilitated in machine building and operation. In the last discipline doctoral courses are also run.Staff of 403 academic teachers, including 81 Professors and Doctors Habilitated and 153 PhDs together with laboratories provide education in all fields of studies and specializations.Co-operation with partner institutions constitutes an important issue for the University. 27 bilateral agreements provide basis for collaboration in research and teaching with 50 universities from 27 countries. The University is currently running 10 projects being a part of international programmes and also research tasks, one of which belongs to the Fifth EU Framework Programme.A number of things differentiate the University from other Polish higher schools:The Centre for Laser Technologies of Metals, named after Prof. Frąckiewicz, the late University Rector, is a joint unit of the University and the Polish Academy of science. It is housed in a modern building completed in 2000. The equipment the Centre has at its disposal , together with the support from the Polish Academy of science provides the possibility of conducting unique research. Such investigations have led, among others, to working out the technology of laser forming, the only one in the world. Apart from the research, the Centre also offers educational options, running a country unique specialization in laser and plasma technologies.The specialization of Repair and Preservation of Historical Monuments combines the practical knowledge of civil engineering with arts and architecture. Its students have recently worked on the overhaul and conservation of the Mirror Room of the Polish Academy of science Station in Paris. The quality of their work and the level of expertise have been highly appreciated. For many years, ordered by the Minister of Culture and National Heritage, inventory making of Polish tombs in Ukraine has been going on.One of the most modern, fully computerised libraries in Poland was made available to the users in 2002.Compact University campus housing laboratories, teaching buildings and hostels as well as the size of the University account for its being student friendly, facilitate human contact, making it easier to find help. Structural computer network, covering also students' hostels, provides access to the world's knowledge and information resources. Student organisations and the Student Cultural and Social Centre operating at the hostel area offer different ways to spend free time. The Student Self-government started to run a new student club in 2002.Careers Office, operating at the University on the basis of agreement with the Province Labour Office, helps our graduates seek job vacancies. Wikipedia.

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Piasecka M.,Kielce University of Technology
Experimental Heat Transfer | Year: 2014

The results of flow boiling heat transfer in a 1-mm-deep vertical minichannel are presented. The heating element for an FC-72 laminar flow in a minichannel is a single-sided enhanced foil with various depressions; liquid crystal thermography was used for measuring temperature distribution of the foil. The void fraction and vapor quality were determined for some cross-sections of two-phase flow images. Results presented in the form of boiling curves were analyzed. Both typical and untypical shapes of boiling curves were found. The suitability of classical methods of two-phase pressure drop determination using experimental verification was confirmed. Copyright © 2014 Taylor & Francis Group, LLC.

The laminated Ni-(Ni 2Al 3 + NiAl 3) and Ni-(Ni 3Al + NiAl) composites have been successfully fabricated by reaction synthesis in vacuum using 400 μm thick Ni sheets and 150 μm thick Al foils. The aluminium layers were completely consumed due to the formation of intermetallics. The final microstructures consisted of alternating layers of intermetallic phases and unreacted nickel could be designed easily because the structures of the composites depend on the treating time and temperature. Reaction synthesis at 620°C for 2 h resulted in a microstructure consisting of Ni and Ni 2Al 3 + NiAl 3 layers. At room temperature the Ni-(Ni 2Al 3 + NiAl 3) laminated composites had an ultimate tensile strength of 615 MPa and an elongation of 10%. The fracture behaviour of the composites exhibited a mixture of brittle fracture of Ni 2Al 3 + NiAl 3 intermetallics and ductile one of Ni layers. Delamination that occurred in the middle of the intermetallic layers was caused by the presence of continuous Al 2O 3 inclusions. The next thermal aging cycle was employed to change the microstructure of intermetallic layers and to improve mechanical properties of the laminated composites. Heat treatment at 1150°C for 4 h resulted in a composite comprising Ni and Ni 3Al + NiAl layers. The Ni-(Ni 3Al + NiAl) laminated composites had an ultimate tensile strength of 875 MPa and an elongation of 24%. The dislocations in the Ni layers could easily slide through the coherent Ni/Ni 3Al interfaces, so Ni 3Al layers co-operatively deformed with the Ni layers during tensile testing. Debonded Ni 3Al/NiAl interfaces containing spherical Al 2O 3 inclusions further encouraged the capability of the Ni 3Al layers for plastic deformation. As a consequence, the Ni-(Ni 3Al + NiAl) laminated composites at room temperature exhibited significant strain-hardening, a good tensile strength and a high ductility. The effect of temperature on the tensile properties and deformation behaviour of the laminated Ni-(Ni 2Al 3 + NiAl 3) and Ni-(Ni 3Al + NiAl) composites have been also investigated. With increasing tensile test temperature from room to 700°C, the ultimate tensile strength decreased gradually for both types of composites. The yield strength of the Ni-(Ni 2Al 3 + NiAl 3) laminated composites decreased and elongation increased with increasing temperature. The abnormal strengthening of the Ni 3Al phase in the Ni-(Ni 3Al + NiAl) composites led to a gradual increase of the yield strength and the fracture elongation decrease with increasing the tensile test temperature. © 2012 Elsevier Inc. All rights reserved.

Blasiak S.,Kielce University of Technology
International Journal of Heat and Mass Transfer | Year: 2015

The mathematical model proposed in this paper describes thermal deformation processes in a non-contacting face seal. The processes include heat transfer phenomena in the rings sealing the radial clearance gap. In a non-contacting face seal with a flexibly mounted rotor (FMR), used, for instance, in a turbomachine, mechanical energy is instantly converted into heat. The heat flux generated in the film between the two faces travels through the structural elements to the surrounding fluid, causing asymmetric distributions of temperature. In the study, the mathematical model of the non-contacting face seal was solved analytically. The distributions of temperature in the rings were calculated using the Fourier-Bessel series as a surface function of two variables (r, z) for a ring cross-section. The thermoelastic problems described with Navier's equations were solved by applying the Boussinesq functions and the Goodier thermoelastic displacement potential. The method used to solve the model is very complex and covers many theoretical and practical problems. These were included and described by presenting the solutions to the thermoelastic problems for non-contacting face seals. The results, especially those concerning fields of temperatures and thermal distortions, were compared with the results available in the literature and those obtained through numerical calculations presented in the author's previous papers. © 2014 Elsevier Ltd. All rights reserved.

Zorawski W.,Kielce University of Technology
Surface and Coatings Technology | Year: 2013

A nanostructured WC-12Co composite coating was prepared by applying the liquid-fuel HVOF spray technique. The microstructure and composition of tungsten carbide nanopowder were analyzed with a scanning electron microscope (SEM) and a transmission electron microscope (TEM). The investigations revealed that the sizes of the original particles were in the range of 50-500nm. The nanostructured coatings had denser structure and higher hardness than the conventional coating. The content of W2C, WC1-x, W and of amorphous phase was also smaller. The coefficient of friction for the HVOF-sprayed nanostructured WC-12Co coating was four times lower than that for the conventionally sprayed WC-12Co coatings. Finally, the nanostructured coating showed higher abrasive resistance than the conventionally sprayed coatings. © 2012 Elsevier B.V.

Mola R.,Kielce University of Technology
Materials Characterization | Year: 2013

Al/Zn-enriched surface layers were fabricated by heating Mg specimens in contact with Al-Zn powder mixtures in a vacuum furnace at 445 C. The layer formation process took place through partial melting at the Mg-substrate/powder- mixture interface. Heating times ranged from 20 to 80 min. The layer microstructure and composition were analyzed by optical microscopy (OM), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The layers were 100-900 μm in thickness, depending on the treatment time. The examination results revealed that the layers consisted of Mg17(Al,Zn) 12 and Mg5Al2Zn2 intermetallic phases and a solid solution of Al and Zn in Mg. Between the Al/Zn-enriched layer and the Mg substrate, there was a transition zone of a solid solution of Al and Zn in Mg with a thickness of 20-30 μm. The layers had much higher microhardness than the Mg substrate. © 2013 Elsevier Inc.

Piasecka M.,Kielce University of Technology
Advanced Materials Research | Year: 2014

The paper describes selected passive methods of modifying properties and structures of metal surfaces. The following surface processes with thermal treatment have been used: laser surface texturing, electromachining (spark erosion) and mechanical process - sand blasting. Practical aspects of the use of produced surfaces in two types of heat transfer devices have been underlined. The first one consists of the heat exchanger with a minichannel furnished with enhanced heating surface. The second one includes prototype solar collectors with the developed surface of the absorber's pipes or smooth pipes covered with developed absorber plate. Modified developed metal surfaces obtained by selected passive methods reach more effective heat transfer in comparison with smooth surfaces. © (2014) Trans Tech Publications, Switzerland.

Piasecka M.,Kielce University of Technology
International Journal of Heat and Mass Transfer | Year: 2013

The paper discusses the results of the flow boiling heat transfer in horizontal (in two positions) and vertical minichannels of 1 mm depth, 40 mm width and 360 mm length. A single-sided enhanced foil with various depressions heats FC-72 laminar flow. Liquid crystal thermography was used for measuring the temperature distribution on the plain side of the foil. The observations of the flow structures were carried out on the enhanced side of the foil contacting fluid in the minichannel, which enabled the identification of flow structures and presentation of flow pattern maps. The void fraction was determined for some cross-sections of two-phase flow images and the vapour quality was determined on this basis. The study employed heat transfer analysis and results regarding local heat transfer coefficient, and boiling curves were constructed. In addition to the typical shapes of boiling curves, the untypical boiling curves with several "stepped" courses of nucleation hysteresis were found. The suitability of classical methods of the two phase pressure drop determination using the experimental verification was confirmed. The comparison of the total measured pressure drop with data obtained from the theoretical models shows that all predicted results fall within the range of ±30%, but only for the vertical minichannel. In most cases the experimental data reached values approaching approximate values in comparison with values from the theoretical models. Calculation of the pressure drop on the basis of the thermodynamic vapour quality and the vapour quality calculated from the experimentally determined void fraction showed a similar dependence. © 2013 Elsevier Ltd. All rights reserved.

Goszczynska B.,Kielce University of Technology
Archives of Civil and Mechanical Engineering | Year: 2014

Application of the acoustic emission method (IADP), to the analysis of crack initiation and growth in concrete and reinforced concrete beams is presented in the paper. This method is based on the idea that every active destructive process becomes a source of acoustic emission. Comparing AE signals, generated within structures under service load, with previously created database, one can identify the processes of active deterioration occurring in an element. They can be located on the basis of the difference in the time, that AE signal reaches the sensors with known wave velocity.Because the cracking process (micro-cracking) occurs in concrete already at the maturing stage, experiments were performed on unloaded concrete members just after concreting (when shrinkage occur) as well as on concrete beams (in technical scale) subjected to continuous loading. It was found that using the IADP method, it was possible to detect and locate creation of micro-cracks (not visible on the member surface) and initiation and growth of cracks, which are visible on the element surface. © 2013 Politechnika Wroclawska.

Kielce University of Technology | Date: 2012-05-28

The invented controller tuning method relies on the following procedure. To the controlled system with known proportional gain the integral type controller is connected in series. The controller gain k_(l )is increased to get the closed loop system to the stability limit. At this stage the controller ultimate gain k_(u )and the sustained oscillation period period T_(osc )of the controlled value are assessed. It is assumed that the controlled system dynamics can be approximated by the first order filter with dead time model. The following formulas allow to estimate the first order filter time constant F(1) and the coefficient =L/T=(arcctg(_(osc)T))/(_(osc)T) where L is the dead time constant of the controlled system model. From the formulas: F(2) the controller model parameters are calculated. After that on the basis of the calculated controller model parameters value the real controller parameters are calculated from the formulas: F (3) the proportional controller gain, the T_(iN )is the integral controller time constant and the T_(dN )is the derivative controller time constant.

Kielce University of Technology | Date: 2012-07-04

The device for positioning a spherical component during measurement of form errors includes a platform (1), pivotally mounted on an aligning ring (18), and a lifting mechanism, fixed to the platform (1) and coupled to a gripping mechanism (5), equipped with a pair of jaws (9, 10), one of which (10) has a rotating mechanism (11) for positioning the spherical component (7) by rotating it about a predetermined angle, and the spherical component (7) is placed on a support (3) mounted on an aligning pin (15), fixed in the aligning ring (18). The rotating mechanism (11) includes a pawl module (12), which cooperates with pitched positioning grooves (13) on the face of an angle-adjusting ring (14), with the pitch of the grooves (13) being, preferably, 30 or 22.5. The support (3) possesses three forked claws (3a) with flat inner surfaces circumscribed about a conical surface.

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