Hydromechanics

Sinaiski, Emmanuil G.; Braun, Moritz

doi:10.1002/9783527633760

Cited by 12 publications

(7 citation statements)

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“…According to Sinaiski [25], the general condition for the beginning of turbulence has been established by Reynolds number (Re), which could be calculated by the formula Re = ρvD / µ ( ρ was the fluid density, v was the fluid velocity, D was the domain diameter, and µ denoted the fluid viscosity). In the present study, ρ = 1.04 g/cm 3 , µ = 0.986 × 10 −3 Pa s, v = 4.3 m/s (the mean velocity, which was half of the inlet flow velocity of the needle), D ranged from 0.63 mm to 0.81 mm for the two extreme positions of the needle tip (at 3.5 mm and 6.5 mm from the apex).…”

Section: Methodsmentioning

confidence: 99%

“…In addition, the critical value of Re (Re cr ) for a pipe flow is approximately equal to 2800. Namely, the flow remains laminar until the Re stays below Re cr , whereas at Re > Re cr , the flow becomes turbulent [25]. Therefore, the flow motions in the present study were modeled by solving the Reynolds-Averaged Navier–Stokes (RANS) equation and the k – ε turbulence model [26].…”

Section: Methodsmentioning

confidence: 99%

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Evaluation of needle movement effect on root canal irrigation using a computational fluid dynamics model

Duan

Wan

et al. 2019

BioMed Eng OnLine

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Background Irrigation is considered to be a critical part of root canal treatment. However, little is known about the effect of needle movement on the irrigation process. Therefore, this study aimed to investigate the influence of the syringe and needle movement on root canal irrigation using a three-dimensional computational fluid dynamics (CFD) numerical model. Methods The CFD codes Flow-3D was adopted to simulate the root canal irrigation process with the syringe and needle moving up and down in motions at different amplitudes and frequencies. One stationary needle was adopted to allow comparison with the needles in up-and-down motions. Six cases where the needles were moving up and down with different amplitudes and frequencies were used to investigate the relationships between the motion of needle and irrigation efficacy. Results The stationary needle gained relatively higher flow velocity and apical pressure all through the irrigation process, while the needles in constant up-and-down motions exhibited lower mean flow velocity and apical pressure. The larger the amplitude, the less mean flow velocity and apical pressure were developed. In addition, the needles moving with different frequencies were similar in the terms of irrigant replacement and apical pressure. Conclusions To avoid periapical extrusion accidents while obtaining adequate irrigant replacement, the needle should be moving up and down with a moderate amplitude during manual root canal irrigation; and the motion frequency was not highly relevant in terms of the irrigation efficiency. Electronic supplementary material The online version of this article (10.1186/s12938-019-0679-5) contains supplementary material, which is available to authorized users.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Evaluation of needle movement effect on root canal irrigation using a computational fluid dynamics model

Duan

Wan

et al. 2019

BioMed Eng OnLine

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“…When the uid ow through the narrowed channel, the uid ow will be accelerated. 38 A higher ow rate in the narrow channel will lower the pressure at the narrowed channel, which is the outside of the bubble. Bernoulli equation still works for the uid ow in our microuid channels, ignoring the viscous force (although strictly speaking, Bernoulli equation works for inviscid ow).…”

Section: Resultsmentioning

confidence: 86%

“…Bernoulli equation still works for the uid ow in our microuid channels, ignoring the viscous force (although strictly speaking, Bernoulli equation works for inviscid ow). 38 Thus, the lowered pressure helps the bubble to grow, which is similar to Bernoulli effect. Larger inow induces larger pressure drop, which benets the growth of the bubble.…”

Section: Resultsmentioning

confidence: 99%

A microfluidics vapor-membrane-valve generated by laser irradiation on carbon nanocoils

Liu

Zhao

et al. 2023

RSC Adv.

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“…Viņš arī Latvijas Universitātē izveidoja un lasīja fakultatīvu priekšmetu "Juridiskā metodoloģija", kas bija veltīts praktisku prasmju apguvei tiesību piemē rošanā. 44 Par juridiskās metodoloģijas jautājumiem Vasilijs Sinaiskis sagatavojis atsevišķu darbu, kurā apkopojis Latvijas Universitātes lekciju materiālus. 45 Līdzīgi nozīmīgs pienesums tiesību teorijas attīstībā bijis Vasilija Sinaiska izdotais žurnāls "Jurists", kas mērķtiecīgi uzsvēra un atgādināja tiesību teorijas nepieciešamību jurista praksē.…”

Section: Tiesību Teorijas Pārtrauktās Perspektīvasunclassified

Tiesību teorija Latvijā starpkaru periodā

Pleps¹,

fakultāte²

2021

Tiesības Un Tiesiskā Vide Mainīgos Apstākļos

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After proclamation of the independence of the Republic of Latvia, it was necessary to create national legal system. In this context, every national legal system needs its own legal theory. Legal theory in the Latvian legal system was based on succession of the former Russian legal theory traditions. The leading legal minds of new Latvian legal system had graduated from the universities of Russian Empire and practiced law in the Russian legal system. They continued their work in the Republic of Latvia, contributing to the new legal system. Furthermore, they created necessary foundations for impressive development of legal theory in Latvia during the interwar period. Prospective development of legal theory was interrupted by Soviet and Nazi occupations, and only partly continued in the exile.

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Hydromechanics

Cited by 12 publications

References 0 publications

Evaluation of needle movement effect on root canal irrigation using a computational fluid dynamics model

Evaluation of needle movement effect on root canal irrigation using a computational fluid dynamics model

A microfluidics vapor-membrane-valve generated by laser irradiation on carbon nanocoils

Tiesību teorija Latvijā starpkaru periodā

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