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Gammal, S. El; Dirschka, Thomas; Oster-Schmidt, Claus

doi:10.1016/b978-3-437-22301-3.10021-5

Cited by 7 publications

(12 citation statements)

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“…Attention must be paid on the rotational speed and its influence on the mass flow rates through the labyrinth seals. However, it's found that in case of very small seals gaps and higher rotational speeds, mass flow coefficient increase [41].…”

Section: Introductionmentioning

confidence: 99%

“…For example, staggered seals limit the movement of rotor in axial direction. A big difference between the so called up-the-step and down-the-step seals, in dependence on the flow direction, while negatively influencing leakage through down-the-step configurations, exists [41,42]. The interlocking type of labyrinth seal is characterized by higher efficiency than the stepped one.…”

Section: Introductionmentioning

confidence: 99%

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Labyrinth seals with application to turbomachinery

Ilieva

Pirovsky

2019

Materialwissenschaft Werkst

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It is well known that there exist losses of fluid through axial and radial gaps in turbomachines, leading to less efficiency. Every 1 % decrease in leakage flow through a high‐pressure gas turbine seals would result in a 0.4 % decrease in the specific fuel consumption [1]. Last decades, a number of solutions have been applied to overcome losses of fluid through axial and radial gaps. A feasible solution is the application of labyrinth seals to act as an obstacle on the way of flow leakages. This research is targeted to attain a seal configuration that has good dynamic sealing properties, higher compliance with the shaft, simple geometry for manufacturing and maintenance. The labyrinth seal must produce significant losses of kinetic energy in order to stop leaks passing through the sealed places. It is known that the turbine shaft exhibits modal and stress loads. Also, seals must be designed to resist loads and operate at maximum efficiency. The fulfilled numerical analysis shows that the proposed geometry causes intensive reduction of leakage flow rates and thus contributes to increase in the efficiency performance of stages under consideration.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Labyrinth seals with application to turbomachinery

Ilieva

Pirovsky

2019

Materialwissenschaft Werkst

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“…The aim of the present paper is to study the total energies, the dissociation energies and the binding energies of the hydrogen molecule 2 and the hydrogen molecular ion 2 + in the presence of external magnetic field in framework of the Variational Monte Carlo (VMC) method, which is used widely in Refs [12][13][14][15][16][17][18][19][20][21]. Therefore, we have extended our previous work [22] to investigate the molecular systems using the VMC method.…”

Section: Introductionmentioning

confidence: 99%

Ground states of the hydrogen molecule and its molecular ion in the presence of a magnetic field using the variational Monte Carlo method

et al. 2016

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AbsractBy Using the variational Monte Carlo (VMC) method, we calculate the 1 state energies, the dissociation energies and the binding energies of the hydrogen molecule and its molecular ion in the presence of an aligned magnetic field regime between 0 . . and 10 . . The present calculations are based on using two types of compact and accurate trial wave functions, which are put forward for consideration in calculating energies in the absence of magnetic field. The obtained results are compared with the most recent accurate values. We conclude that the applications of VMC method can be extended successfully to cover the case of molecules under the effect of the magnetic field.

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“…These signals attributed to (NH) a , (NH) b and (OH) protons respectively. [48,49] The signals of NH groups appeared in high downfield frequencies because of formation of two hydrogen bond between N(36)-H (81) and N(11)-H (48). Appearance of (OH) signal at high frequency is additional evidence that the ligand present in enol form.…”

Section: H and 13 C Nmr Of H 4 Bpcdmentioning

confidence: 99%

“…In vitro and in vivo tests [8] proved that dihydrazides possess non-genotoxic, anti-inflammatory, antioxidant and anticancer activities. [9][10][11][12] Also, their derivatives in the field of analytical chemistry used as reagents for specific chemical separations, [13][14][15] spectrophotometric microdetermination of some metal ions [16][17][18] and used for polymer industry. [19,20] Furthermore, luminescent compounds are very interesting because of their many applications for photocatalysis.…”

Section: Introductionmentioning

confidence: 99%

Spectroscopic investigation, DFT, fluorescence, molecular docking and biological studies of divalent and trivalent binuclear complexes prepared from benzoyl thiosemicarbazide derivative of 2‐benzylmalonohydrazide

El‐Morshedy

El‐Gamil²,

Abou-Elzahab

et al. 2019

Applied Organom Chemis

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The binuclear Cr (III), Mn (II) and Fe (III) complexes of N,N′‐(2,2′‐(2‐benzylmalonyl)bis (hydrazine‐1‐carbonothioyl))dibenzamide (H4BPCD), which derived from the combination of 2‐benzylmalonohydrazide suspension with benzoyl‐isothiocyanate, have been isolated and investigated by the necessary analytical and spectroscopic techniques. The IR studies show that H4BPCD dispose as a mono‐negative hexadentate ligand (NOS)2 towards Mn (II) ion and tetra‐negative hexadentate (NOS)2 towards both Cr (III) and Fe (III) ions. The values of molar conductance in DMSO suggested the non‐electrolytic nature for all complexes. The magnetic measurements and the electronic transitions data confirmed the hexa‐coordinate geometry of complexes. The DFT geometry optimization of all compounds and IR comparative study of both theoretical and experimental of H4BPCD were carried out. Moreover, the H4BPCD and its Cr (III) complex displayed intra ligand (π → π*) fluorescence emission spectra which corroborate their photoactive nature. The coordinated and crystalline water molecules have been investigated by (TG/DTG) studies. The kinetic and thermodynamic parameters were computed using Horowitz‐ Metzger, Coats‐Redfern and Broido methods. Biological studies of DNA binding, minimum inhibitory concentration, in vitro determination of SOD‐like activity and MTT‐cytotoxicity assay as well as molecular docking studies were tested for the ligand and its complexes.

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Gefäßerkrankungen

Cited by 7 publications

References 0 publications

Labyrinth seals with application to turbomachinery

Labyrinth seals with application to turbomachinery

Ground states of the hydrogen molecule and its molecular ion in the presence of a magnetic field using the variational Monte Carlo method

Spectroscopic investigation, DFT, fluorescence, molecular docking and biological studies of divalent and trivalent binuclear complexes prepared from benzoyl thiosemicarbazide derivative of 2‐benzylmalonohydrazide

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