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1
Content available Comparison of single and X-wire measurements of streamwise velocity fluctuations in turbulent boundary layer
100%
Dróżdż A. , Elsner W.
Journal of Theoretical and Applied Mechanics
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2014
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tom Vol. 52 nr 2
499--505
EN
The paper discusses the problem of measuring velocity fluctuations of a turbulent boundary layer using single and X-wire probes. It seems that the difference between the streamwise fluctuating component of these two probes results not only from spatial resolution, but also from influence of the wall-normal fluctuating component, which is usually not considered. It was shown that the vector summing these two components obtained from X-wire probe gives the shape of fluctuation distribution obtained from a single-wire probe. It implies that the underestimation of the near-wall peak of streamwise fluctuating component in X-wire measurements results from disregarded wall-normal fluctuations, which is obviously taken in the case of a single-wire probe. Moreover, it was shown that the criteria for wire length i.e. l+ ≤ 20 could not be sufficient to properly estimate the streamwise and wall-normal fluctuations.
2
Content available remote Monte Carlo study of medium-energy electron penetration in aluminium and silver
88%
Aydın A. , Peker A.
Nukleonika
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2015
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tom 60
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nr 2
361-366
EN
Monte Carlo simulations are very useful for many physical processes. The transport of particles was simulated by Monte Carlo calculating the basic parameters such as probabilities of transmitted–reflected and angular-energy distributions after interaction with matter. Monte Carlo simulations of electron scattering based on the single scattering model were presented in the medium-energy region for aluminium and silver matters. Two basic equations are required the elastic scattering cross section and the energy loss. The Rutherford equation for the different screening parameters is investigated. This scattering model is accurate in the energy range from a few keV up to about 0.50 MeV. The reliability of the simulation method is analysed by comparing experimental data from transmission measurements.
3
Content available Monte Carlo study of medium-energy electron penetration in aluminium and silver
88%
Aydın A. , Peker A.
Nukleonika
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2015
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tom Vol. 60, No. 2
361--366
EN
Monte Carlo simulations are very useful for many physical processes. The transport of particles was simulated by Monte Carlo calculating the basic parameters such as probabilities of transmitted–reflected and angular-energy distributions after interaction with matter. Monte Carlo simulations of electron scattering based on the single scattering model were presented in the medium-energy region for aluminium and silver matters. Two basic equations are required the elastic scattering cross section and the energy loss. The Rutherford equation for the different screening parameters is investigated. This scattering model is accurate in the energy range from a few keV up to about 0.50 MeV. The reliability of the simulation method is analysed by comparing experimental data from transmission measurements.
4
Content available remote Analysis of hot-wire measurements accuracy in turbulent boundary layer
75%
Dróżdż A. , Elsner W.
Zeszyty Naukowe. Cieplne Maszyny Przepływowe - Turbomachinery / Politechnika Łódzka
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2014
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tom nr 145
39--40
EN
The paper discusses the problem of measuring velocity fluctuations of turbulent boundary layer using hot-wire probes. The study highlighted the problem of spatial resolution, which is essential when measuring small-scale in wall-bounded flows. Additionally, the attention was paid to the inconsistency in streamwise fluctuation measurements using single and X-wire probes. To clarify this problem the energy spectra using wavelet transformation were calculated. The analysis was performed for turbulent boundary layer flow, which was characterized by the Reynolds number based on the friction velocity equal ReƮ≈1000.
5
Content available remote Determination of the correlation between the thermal energy and the neutron multiplicity using the backtracing technique
63%
Donadille L. , Desesquelles P. , Liatard E.
Nukleonika
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1998
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tom Vol. 43, nr 3
257-264
EN
The backtracing method is applied to the system(sup 64)Ni + (sup 208)Pb at 8.39 A.MeV incident beam energy measured with the DeMoN detector. We determine the initial thermal energy available in the parent compound nucleus and the total neutron multiplicity distributions. The experimental neutron energy spectra of one, two and three detected neutrons in coincidence with symmetric binary events are used as observables for this procedure.
PL
W pracy zastosowano metodę wstecznego śledzenia do analizy reakcji (sup 64)Ni + (sup 208)Pb przy energii pierwotnej wiązki 8.39 MeV/nukleon z użyciem detektora DEMON. Określamy początkową energię termiczną dostępną w macierzystym jądrze złożonym oraz rozkłady całkowitej krotności neutronów. W metodzie jako "obserwabie" wykorzystano eksperymentalne widma energetyczne neutronów z jednym, dwoma lub trzema zarejestrowanymi neutronami w symetrycznych zderzeniach binarnych.
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