CFD Analysis of the Effect of Elbow Radius on Pressure Drop in Multiphase Flow

Mazumder, Quamrul H.

doi:10.1155/2012/125405

Cited by 23 publications

(14 citation statements)

References 12 publications

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“…6 ). The pressure loss due to a bend is dependent on the ratio of the radius of curvature of the bend to the diameter of the pipe [ 29 ]. We surmised that the discrepancies in pressure loss through the tubular part of NTTs between measured and predicted values are mainly due to the sharp bend of the NTTs, and that the pressure losses due to the bend increase in the preformed NTTs with smaller IDs.…”

Section: Discussionmentioning

confidence: 99%

Role of tube size and intranasal compression of the nasotracheal tube in respiratory pressure loss during nasotracheal intubation: a laboratory study

Futagawa

Takasugi

Kobayashi³

et al. 2017

BMC Anesthesiol

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BackgroundSmall nasotracheal tubes (NTTs) and intranasal compression of the NTT in the nasal cavity may contribute to increasing airway resistance. Since the effects of size, shape, and partial compression of the NTT on airway resistance have not been investigated, values of airway resistance with partial compression of preformed NTTs of various sizes were determined.MethodsTo determine the factors affecting the respiratory pressure loss during the nasotracheal intubation, physical and fluid dynamics simulations were used. The internal minor axes of NTTs in the nasal cavity of intubated patients were measured using dial calipers. In physical and fluid dynamics simulations, pressure losses through the tubular parts, compressed parts, and slip joints of NTTs with internal diameters (IDs) of 6.0, 6.5, 7.0, 7.5, and 8.0 mm were estimated under partial compression.ResultsThe median internal minor axes of the 7.0- and 7.5-mm ID NTTs in the nasal cavity were 5.2 (4.3–5.6) mm and 6.0 (4.2–7.0) mm, respectively. With a volumetric air flow rate of 30 L/min, pressure losses through uncompressed NTTs with IDs of 6.0-, 6.5-, 7.0-, 7.5- and 8.0-mm were 651.6 ± 5.7 (6.64 ± 0.06), 453.4 ± 3.9 (4.62 ± 0.04), 336.5 ± 2.2 (3.43 ± 0.02), 225.2 ± 0.2 (2.30 ± 0.00), and 179.0 ± 1.1 Pa (1.82 ± 0.01 cmH2O), respectively; the pressure losses through the slip joints were 220.3 (2.25), 131.1 (1.33), 86.8 (0.88), 57.1 (0.58), and 36.1 Pa (0.37 cmH2O), respectively; and the pressure losses through the curvature of the NTT were 71.6 (0.73), 69.0 (0.70), 64.8 (0.66), 32.5 (0.33), and 41.6 Pa (0.42 cmH2O), respectively. A maximum compression force of 34.1 N increased the pressure losses by 82.0 (0.84), 38.0 (0.39), 23.5 (0.24), 16.6 (0.17), and 9.3 Pa (0.09 cmH2O), respectively.ConclusionPressure losses through NTTs are in inverse proportion to the tubes’ IDs; greater pressure losses due to slip joints, acute bending, and partial compression of the NTT were obvious in small NTTs. Pressure losses through NTTs, especially in small NTTs, could increase the work of breathing to a greater extent than that through standard tubes; intranasal compression further increases the pressure loss.

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Section: Discussionmentioning

confidence: 99%

Role of tube size and intranasal compression of the nasotracheal tube in respiratory pressure loss during nasotracheal intubation: a laboratory study

Futagawa

Takasugi

Kobayashi³

et al. 2017

BMC Anesthesiol

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“…The pressure-based solver of ANSYS Fluent is used for the simulations. In the mixture model, the drag coefficient needed to compute the relative velocity 51,52 between the phases is calculated using the Schiller and Naumann correlation. 53…”

Section: Methodsmentioning

confidence: 99%

A membrane-less electrolyzer with porous walls for high throughput and pure hydrogen production

Hadikhani

Hashemi

Schenk

2021

Sustainable Energy Fuels

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“…For fully developed flow the required Le/D is approximately between (100 -150) [25]. In this study, due to the difficulties and limitations of the experimental test method, the Le/D was set to be 40, as mentioned and validated by [20]. Unstructured mesh with an optimal number of nodes was used.…”

Section: The Cfd Approach and Geometry Detailsmentioning

confidence: 99%

“…Mazumder and Siddique [19] showed that the pressure decreased at the fluid exits from the elbow and a higher pressure drop obtained at increasing air superficial velocity. Velocity and pressure drop profiles of the mixture and their cross-section contour maps by CFD simulation have been provided for distinctive multi-phase flow conducts [20]. Csizmadia and Hos [21] investigated a computational and experimental studies to determine the friction loss coefficient of power law fluids and Bingham for the flow across elbows and diffuser.…”

Section: Introductionmentioning

confidence: 99%

A computational study of curvature effect on pressure drop of gas-liquid two-phase flow through 90 degree elbow

Saber

Maree

2022

THERM SCI

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Computational fluid dynamics (CFD) analysis of air-water two-phase flows was performed in a 90? vertical to horizontal elbows made of PVC with four different inside diameters (25, 50, 75, and 100 mm) with six different curvature radius to diameter ratios (R/D) 1, 2, 4, 6, 8, and 10. Pressure drops were investigated at various upstream and downstream locations using computational, experimental, empirical methods. The most effective method in investigating and determining total pressure drop of two-phase flow in pipes and bends is considered to be computational study. CFD Simulations were performed using ANSYSY 19.2 Fluent and a mixture model. The studies were conducted under the following two-phase conditions; mass quality from 1 to 50% and mass flux from 350 to 1000 [kg/m2 s]. The results show that the impact of these significant parameters are important and dramatic specially at high curvature radius, mass flux and mass quality. The results of the CFD study demonstrated a substantial loss in energy and pressure as the fluid exits the elbow section, and also a higher drop in pressure observed at higher air velocity. Also, higher pressure drops were obtained with increasing pipe diameter in one side, and with decreasing R/D on the other side. Finally, the current results were verified with the empirical and experimental studies and a good agreement were obtained.

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CFD Analysis of the Effect of Elbow Radius on Pressure Drop in Multiphase Flow

Cited by 23 publications

References 12 publications

Role of tube size and intranasal compression of the nasotracheal tube in respiratory pressure loss during nasotracheal intubation: a laboratory study

Role of tube size and intranasal compression of the nasotracheal tube in respiratory pressure loss during nasotracheal intubation: a laboratory study

A membrane-less electrolyzer with porous walls for high throughput and pure hydrogen production

A computational study of curvature effect on pressure drop of gas-liquid two-phase flow through 90 degree elbow

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