Modern Fluid Dynamics

Kleinstreuer, Clement

doi:10.1007/978-1-4020-8670-0

Cited by 24 publications

(19 citation statements)

References 41 publications

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“…Annular wind tunnels of various sizes have been built at the University of Heidelberg to investigate air-sea gas transfer under different water surface conditions (e.g. Münnich and others, 1978;Jähne, 1980;Schmundt and others, 1995;Krall, 2013). The idea of simulating an infinite fetch with such a shape is therefore not new.…”

Section: Wind Tunnelmentioning

confidence: 99%

“…If there were a logarithmic profile, a velocity of 10 m s −1 at a height of 0.5 m would lead to a friction velocity of ∼0.5 m s −1 over snow (z 0 = 0.1 mm, Clifton and others (2006)). Centrifugal forces lead to a higher friction velocity in a curved duct than in a straight channel with a logarithmic profile and the same free stream velocity (Jähne, 1980). A free stream wind speed of 10 m s −1 should therefore be sufficient.…”

Section: Appendix: Design and Characterization Of The Wind Tunnel A1mentioning

confidence: 99%

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Wind tunnel experiments: saltation is necessary for wind-packing

Sommer

Lehning

Fierz³

2017

J. Glaciol.

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ABSTRACT. Wind-packed snow in the form of slabs or crusts is an important part of alpine and polar snow covers. Yet, the formation process of such layers is poorly understood. For example, it remains unclear whether drifting snow is necessary for wind-packing or not. A better understanding of wind-packing could improve snow-cover models and avalanche danger forecasts and contribute to the assessment of mass balances in polar regions. We designed a closed-circuit, obround wind tunnel to study the process of wind crust formation. A SnowMicroPen was used to measure how the hardness of the snow evolved. The results show that no crust forms without saltation. Drifting snow is a necessary but not sufficient condition for wind-packing. The dynamics of erosion and deposition appear to be equally important.

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Section: Wind Tunnelmentioning

confidence: 99%

Section: Appendix: Design and Characterization Of The Wind Tunnel A1mentioning

confidence: 99%

Wind tunnel experiments: saltation is necessary for wind-packing

Sommer

Lehning

Fierz³

2017

J. Glaciol.

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“…The speed of rotation of the rotor was given n = 48 sec -1 . In the calculation it was considered that the flow regime of the liquid in the RPA is turbulent, so for this case RNG k-ε model of turbulence was chosen [16].…”

Section: Numerical Simulation Modelmentioning

confidence: 99%

Modelling of the hydrodynamic conditions throughout liquid system treatment by alternating impulses of pressure

Dubovkina¹,

Davydenko²,

Rikhter³

2019

Ukr. food j.

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Introduction. The purpose of this scientific work is to research the influence of the application of alternating impulses of pressure throughout treatment of liquid solutions by the numerical modelling. Materials and methods. The volume parametric imitation and visualization, modelling methods, math modelling methods were used for the description of the conditions at the working parts of the rotary pulsed apparatus during the liquid treatment. Experimental investigations of liquid samples were carried out with using potentiometry laboratory measurement procedure. Results and discussion. In this paper, it is established that the local values of pressure in the sector of input of water and water systems and the output of the water systems from the gaps vary: at the external surface of the internal rotor from-50 to +300 kPa; at the external stator surface from-150 to 100 kPa; at the inner stator surface from +40 to-120 kPa; at the inner surface of the external rotor from +100 to-100 kPa. During the last values cavitation and adiabatic boiling can be present. Throughout the water and water solutions treatment and during the processes of mixing liquid associated components in the conditions of hydrodynamic fluctuation as alternating impulses of pressure characterized the changing of pressure: ΔР = 350 kPa near an outside surface of an interior spinning rotor; ΔР = 250 kPa near an outside stator surface; ΔР = 160 kPa near an interior stator surface; ΔР = 200 kPa near an interior surface of an outside spinning rotor. By the consequences of the computation was established that the principal values of speeds of shift of a stream emerge in RPA with coaxial clearances between first rotors, stator and second rotor 100 mkm. Conclusions. Throughout the calculations was found the values of pressure changing in working chamber of rotary-pulsating apparatus between coaxial cylinders «rotor-stator-rotor» system. These give us the possibility to receive the liquids with necessary and required physical and chemical properties and parameters by the no reagent influence and to control this processes.

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“…For the selected test case, it is assumed that the continuum hypothesis is valid, that is, the channel hydraulic diameter D h > 100 μm (see Chapter 7 in ref. [53]). Thus, for steady three-dimensional laminar incompressible nanofluid flow in a microchannel, the continuity, momentum, energy, and species mass transfer equations have to be solved, considering temperature and volume-fraction-dependent mixture properties.…”

Section: Theorymentioning

confidence: 99%