Elementare Strömungsvorgänge dichteveränderlicher Fluide

Truckenbrodt, Erich

doi:10.1007/978-3-540-79024-2_1

Cited by 5 publications

(2 citation statements)

References 30 publications

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“…In this study, the formula presented in Truckenbrodt (2008) is used: ( 31), (32) The second approach uses the Darcy friction factor f . Colebrook (1939) developed an empirical formulation for flow in pipes or ducts which was converted to an explicit formulation by Haaland (1983):…”

Section: Boundary Layer Modelsmentioning

confidence: 99%

Effect of Turbulence and Roughness on Coupled Porous-Medium/Free-Flow Exchange Processes

2016

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The interactions between turbulent free flow and flow in a porous medium are of key interest in different fields, e.g., meteorology, agriculture, building physics, and aerospace engineering. Properly understanding the strongly coupled exchange processes between the two domains is crucial to describing these interactions. In (Mosthaf et al. in Water Resour Res 47(10):W10522, 2011. doi:10.1029/2011WR010685), a concept for coupling laminar compositional single-phase free flow to compositional two-phase porous-medium flow under non-isothermal conditions was presented. In this study, the existing coupling concept is first extended to turbulent free-flow conditions. This includes the interface conditions between a Reynolds-averaged Navier-Stokes free flow using algebraic turbulence models and a Darcy porous-medium flow. Second, eddy viscosity and boundary layer models for a rough interface are integrated into this model concept. Results from laboratory evaporation experiments are used for comparison of the developed model concept. A sensitivity analysis of the evaporation rate and porous-medium quantities on different model setups, boundary conditions, BeaversJoseph coefficients, and roughness lengths is performed. Results demonstrate how including turbulence, either with eddy viscosity or boundary layer models, affects the evaporation rate. The model concept is able to predict early stage-I and intermediate to later stage-II evaporation rates. Sand-grain roughness concepts are successfully included into the model and show the desired qualitative effect.

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Section: Boundary Layer Modelsmentioning

confidence: 99%

Effect of Turbulence and Roughness on Coupled Porous-Medium/Free-Flow Exchange Processes

2016

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“…The commercial prospects for rupture discs are broad because the manufacturing methods for rupture disks are convenient and rupture discs allow leakage of overpressure media without causing secondary damage [8]. To facilitate practical applications of rupture discs, the typical industrial standard [9,10] emphasizes the pressure limitation of the entire pressure relief system, and most researchers and engineers propose specific indicators of the discharge effect of rupture discs under such rated conditions. For example, some scholars discussed the characteristics of the actual mass flow of a compressible fluid while leaking at the rated pressure [11,12], and some scholars established a new descriptive theory of the venting effect [13] based on the thermodynamic property changes caused by friction and heat exchange.…”

Section: Introductionmentioning

confidence: 99%

Influence of Moulding Pressure on the Burst Pressure of Reverse-Acting Rupture Discs

Liu

Yuan

et al. 2021

Processes

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Rupture discs, also called bursting discs, are widely used in pressure vessels, pressure equipment, and pressure piping in process industries, such as nuclear power, fire protection, and petrochemical industries. To explore the relationship between the burst pressure of reverse-acting rupture discs and their production, two common manufacturing methods, air pressure moulding and hydraulic moulding, were compared in this study. Reverse-acting rupture discs that complied with the form recommended by API 520-2014 were prepared with four release diameters, and burst pressure tests were carried out. These results showed an obvious negative correlation between the forming pressure of rupture discs and their actual burst pressure for all experimental samples. Further study showed that the main reason for this correlation was a reduction in thickness at the top of the rupture disc caused by large plastic deformation during compression moulding. To explore the relationship between the thickness reduction effect and moulding method, this study defined the “relative ratio of thickness reduction” and concluded that the effect of decreasing the thickness of the rupture disc was more obvious for rupture disc substrates with less flexural rigidity. The above conclusions have important significance for guiding the control of the burst pressure of rupture discs.

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Significance of Truckenbrodt's Energy and Momentum Coefficients for Loss Calculation in Ramified Pipe Systems

Niessner¹,

Codan

2010

Proc Appl Math and Mech

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For one-dimensional simulation of flow in ramified pipe systems loss prediction in junctions is essential. In the standard literature (e.g.[1]) total pressure loss coefficients serve this purpose. Elementary formulas follow from the principle of momentum and some simple assumptions [2]. They yield rather crude estimates, often twice as large as experimental values. Modifications described by Idelchik [3] look nice, but after all turn out to be not more accurate. We explain deviations and propose improved loss formula based on Truckenbrodt's energy and momentum coefficients [4], thus paying regard to velocity distributions over pipe cross-sections. We further discuss extraction of the coefficient's values from experiments.

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Elementare Strömungsvorgänge dichteveränderlicher Fluide

Cited by 5 publications

References 30 publications

Effect of Turbulence and Roughness on Coupled Porous-Medium/Free-Flow Exchange Processes

Effect of Turbulence and Roughness on Coupled Porous-Medium/Free-Flow Exchange Processes

Influence of Moulding Pressure on the Burst Pressure of Reverse-Acting Rupture Discs

Significance of Truckenbrodt's Energy and Momentum Coefficients for Loss Calculation in Ramified Pipe Systems

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