Temat: insert - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Analysis of the Mechanical Properties of the Titanium Layer Obtained by the Mold Cavity Preparation Method
Autorzy:: Dulska, A.
Szajnar, J.
Król, M.
Tematy:: modular insert
titanium layer
cast iron
SLM; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/2049618.pdf Link otwiera się w nowym oknie
Opis:: The article presents the technology of layered casting with the use of 3D printing to make a frame insert. The insert was made of powdered titanium and then filled with liquid cast iron. The paper presents the results of research, including structure observation and hardness measurements, as well as abrasion resistance tests. The results indicate the possibility of creating a local reinforcement using a frame insert. The resulting casting is characterized by a local increase in hardness and, in addition, an increase in abrasion resistance of the entire surface layer. The quality of the obtained connection depends strongly on the casting parameters.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 2.

Tytuł:: Influence of ALSi7mg0,3 Modification by Sr to Its Machining Process Quality
Autorzy:: Náprstková, Nataša
Cais, Jaromír
Svobodová, Jaroslava
Wydawca:: Savaş Kitap ve Yayınevi
Opis:: Al-Si Alloys are a leading casting alloys based on aluminum. Machining of aluminum alloys is currently frequently used and it is an important area of production. The paper deals with an experiment, that was realized at the Faculty of Production Technology and Management, University of Jan Evangelista Purkyně in Ústí nad Labem, where was machined alloy AlSi7Mg0.3. Samples were made for machining because of the master alloys of AlSi7Mg0.3, where part of the castings was left in its original condition and part of the castings was modified by strontium. This paper describes the evaluation of surface roughness and tool wear obtained after machining of these castings in terms of how the modification by strontium can affect this.
Stanisław Borkowski
Dostawca treści:: Repozytorium Centrum Otwartej Nauki

Artykuł

na półce

Skocz do pozycji: 3.

Tytuł:: Effect of using insert on the flow pressure in cylindrical silo
Autorzy:: Hammadeh, Hala
Askifi, Farzat
Ubysz, Andrzej
Maj, Marek
Zeno, Amjad
Tematy:: silo model
flow pressure
insert
wall pressure; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/178369.pdf Link otwiera się w nowym oknie
Opis:: This paper presents an experimental investigation of the discharge flow pressure in the vertical silo and the hopper due to the use of insert (top cone with trunk cone bottom). Using the Insert inside the silos is one of the proposed solutions to avoid the problems of having funnel flow pattern, which has a significant effect on the distribution of flow pressure exerted on the silo wall and the hopper. The experiments were performed on a metal cylinder prototype; corn was used as a granular material, and the wall and hopper pressure distribution was measured by a special pressure transducer. The experiments revealed an important result in the flow pressure due to the change in the location of the insert. The experiments were conducted in Damascus University laboratories.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 4.

Tytuł:: Effect of progesterone-releasing intravaginal device on reproductive performance of cows with cystic ovarian follicles after puerperium
Autorzy:: Rudowska, M.
Barański, W.
Zduńczyk, S.
Tobolski, D.
Janowski, T.
Tematy:: cows
cystic ovarian follicles
progesterone insert
fertility; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/2087479.pdf Link otwiera się w nowym oknie
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 5.

Tytuł:: Simulations of flow patterns in silos with a cellular automaton: Part 1
Autorzy:: Kozicki, J.
Tejchman, J.
Tematy:: cellular automation
granular flow
flow pattern
insert
silo; Pokaż więcej
Wydawca:: Politechnika Gdańska
Powiązania:: https://bibliotekanauki.pl/articles/1965146.pdf Link otwiera się w nowym oknie
Opis:: A simplified cellular automaton was used to calculate the kinematics of non-cohesive granular materials during confined flow in silos. In this model, granular flow was assumed to be an upward propagation of holes through a lattice composed of cells representing single particles. Calculations were carried out with different silo shapes and inserts, transition probabilities, migration rules, outflow schemes, grid types, wall roughness and cell numbers. To visualize the calculation process, horizontal layers of various shades were introduced. The simulation results were compared with laboratory tests in model silos.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 6.

Tytuł:: Comparative experimental analysis of fluid flow in a concentric tube exchanger having semi hollow cylindrical macro inserts with nanofluid and base fluid
Autorzy:: Kaushik, Shivasheesh
Singh Mahar, Vikas
Singh, Satyendra
Kshetri, Rahul
Kumar, Bhupendra
Singh Mehta, Jagdish
Raj Paul, Ashwarya
Kumar, Satish
Vashisth, Samriddhi
Singh Pundir, Raj
Kumar, Amit
Tematy:: longitudinal spacing
macro insert
fin height
nanofluid
orientation
ultrasonication; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Powiązania:: https://bibliotekanauki.pl/articles/59111964.pdf Link otwiera się w nowym oknie
Opis:: Nanofluids represent a novel category of advanced heat transfer fluids composed of nanoparticles within a size range of 1-20 nm dispersed in a base fluid such as water. Contemporary research predominantly focuses on incorporating nanoparticles like Al2O3 and ZnO into the water at a 0.1% volume fraction to create nanofluids. Recent investigations aim to optimize thermal performance by introducing nanoparticles into the base fluids and inducing turbulence through various macro-inserts. Key factors influencing heat exchanger efficiency enhancement include geometric parameters, thermal conductivity and volume fraction. This study endeavours to analyse the thermal and fluid flow characteristics of a proposed nanofluid, augmenting thermal transfer through computational simulations and experimental validation, achieving an error margin of 3%-5%. The impact of rectangular micro inserts, with dimensions of 4 cm in height and longitudinal spacings of 5 cm and 11.5 cm, on the heat transfer rate is examined to enhance fluid flow turbulence. Results indicate that among different geometric profiles, the insert with a spacing of 11.5 cm demonstrates superior performance, yielding higher heat transfer rates and Nusselt numbers. This research holds significant implications for various industries including thermal, power, aviation, space and automotive sectors, particularly in the utilization of concentric tube heat exchangers across diverse applications. By exploring novel geometrical and fluid domains within heat exchangers, this study unveils promising avenues for enhancing the heat transfer efficiency compared to conventional methods, highlighting the potential for further investigation into alternative materials and configurations for heat elimination enhancement.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 7.

Tytuł:: Loads on walls and inserts in a mass-flow silos
Autorzy:: Ding, S.
Wójcik, M.
Jecmenica, M.
Silva de, S. R.
Tematy:: silo flow/loads
insert
Lagrangian-Eulerian
adaptive
fillet; Pokaż więcej
Wydawca:: Politechnika Gdańska
Powiązania:: https://bibliotekanauki.pl/articles/1955779.pdf Link otwiera się w nowym oknie
Opis:: A finite element analysis has been carried out to investigate flow patterns and loads on silos either with a ralatively steep hopper, or with a shallow hopper but in the presence of an insert. A Lagrangian-Eulerian approach was first adopted to simulate the material flow pattern, with the precondition that mass flow was obtained. It was then attempted to predict the loads exerted by granular materials on the walls of such silos. The load on the insert was also simulated. Techniques such as the adoption of adaptive meshes and filleting along sharp corners were applied in the analysis to overcome the difficulties usually encountered with large deformations in the FEM and the mathematic singularity presented by the abruptness of geometry. Filleting proved to be necessary to bring down the pressure peak at the transition level. The insert took over a significant part of the loads. Comparison with the classic theories have confirmed that the loads predicted on the wall agree quite well with the theoretical results in the silo's cylinder section, but that differences exist in the hopper section; the difference is greater when the hopper is shallower. It has also shown the limitations of predicting flow patterns of granular materials with the traditional elastic-plastic model; a more advanced model is needed.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 8.

Tytuł:: Tribological properties of the seat insert - valve - guide assembly for valve driven magnetoelectrically
Autorzy:: Siczek, K.
Tematy:: combustion engine
valve timing
seat insert
valve guide
magnetoelectrical drive; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/247681.pdf Link otwiera się w nowym oknie
Opis:: The researches have been carried out, where the object has been the set of two friction couples: valve stem - valve guide and valve seat - seat insert. The camless driven valve has been common for each of such cases. The analyzed valve has been driven by magnetoelectrical drive. The speciał research stand has been elaborated and its scheme has been presented in the article. It has been measured the valve lift and valve acceleration, the impact force, the friction force, temperature values for valve guide and for seat insert, sound level during impacting on the stand. The aim of researches has been to determine the dynamic parameters, the friction force between valve stem and valve guide, the impact force for valve impacting seat insert vs. frequency and valve lift. The analyzed valves have mated with seat inserts and valve guides made of cast iron, in oil absence. The valves have been made of TiAl6Zr4Sn2Mo2 alloy. The researched friction couples have operated in temperature equal 293 K. The increase of frequency has resulted in small changes for values of lift and in greater changes of acceleration, during valve impact into its seat insert. The greatest values of impact force and acceleration have been for the small, middle and high values of valve lift, either. The ratio of impact force and valve acceleration has changed in thin bands. The friction force has decreased slightly with frequency increase and has decreased with valve lift increase. The sound level has increased with the frequency increase, and has not been dependent upon valve lift.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 9.

Tytuł:: The simulation researches on the wear for elements of the seat insert-valve-valve guide assembly
Autorzy:: Siczek, K.
Kuchar, M.
Tematy:: combustion engine
valve timing
lightweight valve
seat insert
valve guide; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/247694.pdf Link otwiera się w nowym oknie
Opis:: The researches have been carried out, where the object has been the elements of valve trains in the different combustion engines. Those elements have been valve, valve guide and seat insert. The analysed valves have been driven by special camshaft, with the cams of trapezoid shape. The special research stand has been elaborated and its scheme has been presented in the article. The mentioned research stand has been driven by electric motor. The rotational velocity of the camshaft has been controlled and measured. The aim of the researches has been to obtain values of wear for valve, seat insert, valve guide vs. valve lift, and rpm of camshaft. The dynamic parameters have been analyzed for the seat insert - valve - valve guide assembly, experimentally and by simulation either. During researches the values of valve lift, of valve acceleration, of temperature for seat insert and additionally sound level have been measured. The wear of valve, seat insert and valve guide has been measured, basing on their initial and post-research geometry. The results of experimental researches obtained for different materials for valve, valve guide and seat insert have been presented in the article. The simulation model of the analyzed seat insert - valve - valve guide assembly has been elaborated and presented in the article. Such model has been needed to calculate the values o f the settle velocityfor the analyzed valve. The wear of titanium valve has been a little greater than of the steel valve, the wear of cast iron seat insert mating with steel valve has been much greater than for titanium valve case. The wear of valve guides, made of bronze has been several times less than those of cast iron.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 10.

Tytuł:: Numerical Modeling of Wall Pressure in Silo with and Without Insert
Autorzy:: Askif, Frzat
Hammadeh, Hala
Ubysz, Andrzej
Maj, Marek
Tematy:: numerical modeling
silo
silo model
flow pressure
insert
wall pressure; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/1845157.pdf Link otwiera się w nowym oknie
Opis:: This paper presents a methodology based on the finite element method to simulate the flow of granular materials. Moreover, it allows proper estimation of dynamic pressure during silo discharge since this subject is still under discussion, especially for designing silos with an insert (an input element). A 2-D simulation of the discharge process of a cylindrical silo with cone and a central discharging orifice was performed. Two cases were studied, with and without using insert in silo. Numerical analysis was carried out with the help of the uncoupled arbitrary Lagrangian–Eulerian (ALE) approach. The resulting dynamic pressure distribution on the silo wall for each of the two cases was inferred numerically. The resulting values of pressure were compared with the results of the experimental study on a cylindrical metal silo to demonstrate the accuracy of the numerical model in determining the dynamic wall pressure, especially in the case of using an insert in silo during discharge.
Dostawca treści:: Biblioteka Nauki

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