Failure Analysis of Heat Exchangers with a Valid CFD Simulation

Sass, Ádám; Kummer, Alex; Ulbert, Zsolt; Egedy, Attila

doi:10.3311/ppch.17095

Cited by 3 publications

(2 citation statements)

References 24 publications

(25 reference statements)

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“…Usually the k-ε turbulence model is used for simulating turbulence and hydraulics of a column with CFD method [12][13][14]. It can be an accurate method of modelling industrial problems [15].…”

Section: Introductionmentioning

confidence: 99%

CFD Investigation of Dry Tray Pressure Drop of Perforated Trays without Downcomer

Kállai

Mizsey

Szepesi

2023

Period. Polytech. Chem. Eng.

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The dry tray pressure drop behaviors in trays without downcomer with different inclination of holes (standard, 75°, 60° and 45°) and tray thickness (2.5, 5, and 10 mm) are investigated. The trays are investigated using computational fluid dynamics (CFD) in Ansys Fluent® software. 20 °C air was used to represent the gas phase with 20–50 m3/h flow rates. The column there are four trays with 7 mm of hole diameter.The CFD results determined that the higher angle of the holes with respect to the tray causes smaller dry tray pressure drop and turbulence intensity in the gas flow. Furthermore, in 75° hole inclined perforated tray and the standard hole the dry tray pressure drop is similar. From the simulation results it is also determined that in case of higher tray thickness the dry tray pressure drop is lower.On the basis of the CFD simulation results some correlations can be determined for the calculation of the dry tray pressure drop of the different trays.

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Section: Introductionmentioning

confidence: 99%

CFD Investigation of Dry Tray Pressure Drop of Perforated Trays without Downcomer

Kállai

Mizsey

Szepesi

2023

Period. Polytech. Chem. Eng.

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“…In recent years, Computational Fluid Dynamics (CFD) computations proved to be an accurate and affordable way of modelling industrial problems [23], and non-Newtonian flows [24][25][26]. Bartosik [27] modelled the turbulent flow of Herschel-Bulkley fluids in a smooth horizontal tube.…”

Section: Introductionmentioning

confidence: 99%

CFD-based Estimation of Friction Factor in Rough Pipes with Herschel-Bulkley Fluids

Csizmadia

Dombóvári

Till

et al. 2023

Period. Polytech. Chem. Eng.

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The appropriate estimation of frictional losses in a pipeline system is essential. So far, little attention has been paid to determining the friction factors with non-Newtonian fluids, especially in rough pipes. This study aims at calculating the friction factor using validated three-dimensional Computational Fluid Dynamics models in Ansys CFX. Steady-state computations are performed with three different incompressible Herschel-Bulkley fluids in rough pipes with relative roughness of the inner pipe surface ε = 0.0005 – 0.01. A power-law type bath gel as a test fluid is used for experiments to validate our numerical model. The numerical results are compared with the measured values and also with numerous existing friction factor estimation models with the help of generalization of the Reynolds number in the relevant engineering range of Regen = 100 – 40,000. This paper shows that the existing approximations can not accurately describe the friction factor with pseudoplastic fluids in rough pipes. On the contrary, in the case of Bingham plastic fluid, a new, explicit calculation relation is found in a unified form accepted by the literature.

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Reliability-based design optimization of screw shaft for continuous high-pressure hydrothermal co-liquefaction process

Venkatachalam,

Bhuvaneshwaran,

Sengottian

et al. 2024

CI&CEQ

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Hydrothermal co-liquefaction (HTCL) is the prominent process for producing bio-products with a higher conversion rate. It is performed at high temperatures and pressure in the presence of water. Earlier, it was mostly conducted in batch reactors, but it has major limitations including operating volume, back mixing and tedious process for high productivity. With that, the present investigation is performed on designing the screw shaft for the high-pressure HTCL process. The dimensional factors including flight length, pitch, helix angle and depth were considered to design the optimal screw shaft. Likewise, principal stresses, shear stress, bending stress, bending moment and total deformation were regarded as inevitable response variables to analyze the internal strength of the shaft. In this regard, the Taguchi approach provides the L9 (34) orthogonal array as an experimental design. Then, the numerical results from the transient structural analysis were analyzed with the assistance of statistical methods such as Grey Relational Grade (GRG), Grey Fuzzy Reasoning Grade, Analysis of Variance (ANOVA) and Taguchi method to find the most influential dimensions for minimizing the response variable. Consequently, the results from both GRG and Taguchi optimization were compared and selected the most optimum parameters.

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Failure Analysis of Heat Exchangers with a Valid CFD Simulation

Cited by 3 publications

References 24 publications

CFD Investigation of Dry Tray Pressure Drop of Perforated Trays without Downcomer

CFD Investigation of Dry Tray Pressure Drop of Perforated Trays without Downcomer

CFD-based Estimation of Friction Factor in Rough Pipes with Herschel-Bulkley Fluids

Reliability-based design optimization of screw shaft for continuous high-pressure hydrothermal co-liquefaction process

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