Theoretical research of friction factor in hydraulically smooth pipes

Khlapuk, M. M.; Bezusyak, Olexander; Volk, Liubov; Zhang, Zelu

doi:10.1051/e3sconf/202128010009

Cited by 7 publications

(4 citation statements)

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“…A theoretical response model was established ( Supplementary Note S3 and Figure S4 ) to express the generated charge Q inside the DSHPS as follows:

where n is a positive value, t 1 is the thickness of the P(VDF-TrFE)/BTO nanofiber mat, and D and H are the diameter and height of the cilium, respectively. The details are available in Supplementary Note S3 [ 35 , 36 , 37 ].…”

Section: Resultsmentioning

confidence: 99%

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A Highly Sensitive Deep-Sea Hydrodynamic Pressure Sensor Inspired by Fish Lateral Line

Hu,

Ma,

Gong

et al. 2024

Biomimetics

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Hydrodynamic pressure sensors offer an auxiliary approach for ocean exploration by unmanned underwater vehicles (UUVs). However, existing hydrodynamic pressure sensors often lack the ability to monitor subtle hydrodynamic stimuli in deep-sea environments. In this study, we present the development of a deep-sea hydrodynamic pressure sensor (DSHPS) capable of operating over a wide range of water depths while maintaining exceptional hydrodynamic sensing performance. The DSHPS device was systematically optimized by considering factors such as piezoelectric polyvinylidene fluoride–trifluoroethylene/barium titanate [P(VDF-TrFE)/BTO] nanofibers, electrode configurations, sensing element dimensions, integrated circuits, and packaging strategies. The optimized DSHPS exhibited a remarkable pressure gradient response, achieving a minimum pressure difference detection capability of approximately 0.11 Pa. Additionally, the DSHPS demonstrated outstanding performance in the spatial positioning of dipole sources, which was elucidated through theoretical charge modeling and fluid–structure interaction (FSI) simulations. Furthermore, the integration of a high Young’s modulus packaging strategy inspired by fish skull morphology ensured reliable sensing capabilities of the DSHPS even at depths of 1000 m in the deep sea. The DSHPS also exhibited consistent and reproducible positioning performance for subtle hydrodynamic stimulus sources across this wide range of water depths. We envision that the development of the DSHPS not only enhances our understanding of the evolutionary aspects of deep-sea canal lateral lines but also paves the way for the advancement of artificial hydrodynamic pressure sensors.

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“…A theoretical response model was established ( Supplementary Note S3 and Figure S4 ) to express the generated charge Q inside the DSHPS as follows:

Section: Resultsmentioning

confidence: 99%

“…where n is a positive value, t 1 is the thickness of the P(VDF-TrFE)/BTO nanofiber mat, and D and H are the diameter and height of the cilium, respectively. The details are available in Supplementary Note S3 [35][36][37].…”

Section: Material Structural Dimensional and Package Optimization Of ...mentioning

confidence: 99%

A Highly Sensitive Deep-Sea Hydrodynamic Pressure Sensor Inspired by Fish Lateral Line

Hu,

Ma,

Gong

et al. 2024

Biomimetics

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“…Branching and merging of streams can also provide additional resistance to movement. Especially important in aerodynamic calculations is the consideration of local resistances, which are associated with the design features of the system [11].…”

Section: Resultsmentioning

confidence: 99%

“…In the case of the expression of the coefficient ζ relative to the velocity head (in a wide section), the following is obtained (11):…”

Section: Resultsmentioning

confidence: 99%

Examination of the influence of hydrothermal treatment of textile materials on their physical and mechanical properties and development of innovative technology

Tashpulatov,

Bakhriddinova,

Nutfullaeva

et al. 2023

Scientific Herald of Uzhhorod University Series Physics

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Relevance. Investigation in the field of textile materials and the effect of processing on their properties, is relevant, as it helps to develop more effective processing methods and increase the resistance of textile materials to the influence of various factors, which is important for both manufacturers and consumers. Purpose. The purpose of the study was to examine the effect of hydrothermal processing of textile materials on their physical and mechanical properties, develop a technology for the production of clothing using a new method (device) of press equipment for hydrothermal processing of composite material. Methodology. The analysis method was used during the study, and an experiment was also conducted in which the temperature of the steam that did not fall below 160°C was used when processing the selected fabric samples, and the temperature of the working bodies of the press for forming the back was at least 110°C. Results. As a result, the influence of hydrothermal treatment on the properties of textile materials was examined in detail and established. Having analysed the existing method of hydrothermal treatment using a vacuum unit, it was established that the conventional method of treatment leads to a substantial decrease in fabric thickness, breaking load and air permeability. It was also noted that during the hydrothermal treatment of the material, it is exposed under the influence of pressure. This leads to densification and flattening of the threads inside the material, creating flat areas, which causes adverse changes in the physical and mechanical characteristics of the fabric. Conclusions. These factors indicate a potential deterioration in the quality and durability of textile products, which can increase the percentage of defects and negatively affect consumer satisfaction. This study also points to the prospects of using a vacuum installation in hydrothermal treatment, which allows preserving the desired properties of materials, improving the quality of the final products. The practical importance of the results of this study lies in the possibility of improving the quality of textile products and reducing the damage to materials, which is important for ensuring longer operation of textile products and increasing consumer satisfaction

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Necessity and ways to improve the calculation of a closed collector-drainage network of drainage systems

Volk,

Rokochynskyi,

Volk

et al. 2024

Sustain. Water Resour. Manag.

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Theoretical research of friction factor in hydraulically smooth pipes

Cited by 7 publications

References 1 publication

A Highly Sensitive Deep-Sea Hydrodynamic Pressure Sensor Inspired by Fish Lateral Line

A Highly Sensitive Deep-Sea Hydrodynamic Pressure Sensor Inspired by Fish Lateral Line

Examination of the influence of hydrothermal treatment of textile materials on their physical and mechanical properties and development of innovative technology

Necessity and ways to improve the calculation of a closed collector-drainage network of drainage systems

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