Elementare Strömungsvorgänge dichtebeständiger Fluide

Truckenbrodt, Erich

doi:10.1007/978-3-642-96766-5_3

Cited by 7 publications

(11 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Note the non dimensional velocity in channel centre is proportional to Reynolds number. This relationship is consistent to the numerical results of Ciofalo and Collins [1], which is quantified in Table 1 45 in the test section, which suits well with the value from Truckenbrodt [9]. The increase in the magnitude of the fluctuations is assumed to be an indication of an increasing turbulence in the downstream region.…”

Section: Discussionsupporting

confidence: 88%

PIV measurements on the formation of the flow field and aerosol particle distribution in a turbulent square duct flow

Barth¹,

Banowski²,

Hampel³

2012

Advances in Fluid Mechanics IX

View full text Add to dashboard Cite

The formation of the flow field and spatial aerosol particle distribution play an important role in various industrial applications. Regarding experiments on aerosol particle transport phenomena in turbulent flows it is of essential interest to generate a homogeneously mixed air stream. Particle Image Velocimetry (PIV) measurements have been conducted in order to characterize the turbulent mixing process in a small-scale gas/aerosol test facility which is designed for the investigation of deposition and resuspension of nuclear aerosol particles. The turbulent flow field in a square duct (Re d = 8.9k..43k) is seeded with DEHS droplets in the size range of approximately d Paero = 2 µm. Firstly, the downstream formation of particle mixing is quantified in terms of the spatial distribution of the scatter light intensity of the PIV images. It is found that sufficient mixing of the aerosol particles is accomplished at 8 to 10 hydraulic diameters downstream of the injection point. Furthermore, the formation of the flow field is evaluated in terms of the time mean averaged velocity as well as velocity fluctuations. These values are presented at successive downstream positions and display the development of the turbulent boundary layer. It is shown that the near wall turbulent region of the test section nicely follows the universal slope of a well developed turbulent boundary layer. Nevertheless, the flow field formation still takes place after 20 hydraulic diameters.

show abstract

Section: Discussionsupporting

confidence: 88%

PIV measurements on the formation of the flow field and aerosol particle distribution in a turbulent square duct flow

Barth¹,

Banowski²,

Hampel³

2012

Advances in Fluid Mechanics IX

View full text Add to dashboard Cite

show abstract

“…The heat flux ∆Φ through the contact area ∆A is defined as ∆Φ = ϕ∆A with the thermal flux density ϕ. For further details on the derivation of heat capacity, adiabatic exponent, viscosity and thermal conductivity refer to [AH92,AdP01,Sed72,Tru89].…”

Section: The Thermal Conductivity λ λ λmentioning

confidence: 99%

“…From the conservation of mass, momentum and energy of a compressible inviscid fluid (where we neglect heat conduction) the Euler equations of gas dynamics can be derived (see also [FP97,Tru89]). In Eulerian coordinates they can be written in the following conservative form:…”

Section: The Euler Equationsmentioning

confidence: 99%

See 1 more Smart Citation

Development of an Efficient 3–D CFD Software to Simulate and Visualize the Scavenging of a Two-Stroke Engine

Trescher

2007

Arch Computat Methods Eng

View full text Add to dashboard Cite

Picture on title page:The series of three pictures on the left hand side of the image depicts an iso-surface of freshgas concentration in the two-stroke engine cylinder after opening of the transfer ports, at the lowest position of the piston, and shortly before closing of the transfer ports (from top to bottom). On the right hand side, different particle traces through the cylinder (top) and the crankcase (bottom) are shown. PrefaceThe two-stroke engine is widely used in many different devices. But the environmentally problematic exhaust characteristic is a big drawback of this type of engine. In the scavenging process, when the fresh charge displaces the exhaust gas in the cylinder, lies the biggest opportunity to improve the exhaust data by geometry optimization. In order to give the engineer the opportunity to analyze the flow field and to compare different engine geometries, we developed a software package to efficiently simulate the three-dimensional, time-dependent, Navier-Stokes equations within the complex, real-world geometry of the two-stroke engine with moving piston and rotating crankshaft.

show abstract

“…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.…”

mentioning

confidence: 99%

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

Niessner¹,

Codan

2010

Proc Appl Math and Mech

View full text Add to dashboard Cite

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.

show abstract

Elementare Strömungsvorgänge dichtebeständiger Fluide

Cited by 7 publications

References 0 publications

PIV measurements on the formation of the flow field and aerosol particle distribution in a turbulent square duct flow

PIV measurements on the formation of the flow field and aerosol particle distribution in a turbulent square duct flow

Development of an Efficient 3–D CFD Software to Simulate and Visualize the Scavenging of a Two-Stroke Engine

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

Contact Info

Product

Resources

About