Grenzschicht-Theorie

Schlichting, Hermann; Gersten, Klaus

doi:10.1007/978-3-662-07554-8

Cited by 317 publications

(251 citation statements)

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“…The size of the boundary layer depends amongst others on the development length. It can be approximated with the Blasius solution for the laminar boundary layer: (1) and for the turbulent boundary layer:…”

Section: Methodsmentioning

confidence: 99%

“…where, is the local boundary layer thickness, is the development length and is the Reynolds number based on [1]. For the calculation of the Reynolds number and are taken at the inlet.…”

Section: Methodsmentioning

confidence: 99%

“…In this illustration of the boundary layer thickness , 3 10 is assumed for the onset of transition. According to Schlichting and Gersten [1], this is valid for "normal" longitudinal flow along a flat plate with a sharp leading edge. Additionally they state that, this critical Reynolds-number can be increased to Although it is not clear, if these transition onset criteria stated by Schlichtung and Gersten are valid for the designed test bench, it is a good start for estimating the beginning of transition.…”

Section: Methodsmentioning

confidence: 99%

“…have an influence, if a boundary layer is laminar or turbulent, but at the first contact of a flow with a stationary structure the boundary layer starts laminar and will become turbulent (under the right flow conditions) via a transitional area. The boundary layer passes through several stages within this transitional zone until it becomes fully turbulent [1].…”

Section: Introductionmentioning

confidence: 99%

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On the Setup of a Test Bench for Predicting Laminar-to-Turbulent Transition on a Flat Plate

Bader¹,

Sanz²

2016

JEPE

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At turbomachinery relevant flow conditions the boundary layers are often transitional with laminar-to-turbulent transition occurring. The characteristics of the main flow can depend highly on the state of the boundary layer. Therefore it can be vitally important for the designer to understand the process of laminar-to-turbulent transition and to determine the position and length of the transitional region. In this paper the flow over a flat plate is experimentally studied in order to investigate and better understand transitional flow. Preston tube measurements as well as a thermographic camera system were performed for two different inlet velocities in order to determine the position of the transitional zone. The results of the experiment are compared to numerical flow solutions using a common transition model to determine its capability. The simulation has been performed with the two commercial codes CFX ® and Fluent ® by Ansys ® and an in-house code called LINARS. As a result of this study, a better understanding of the experimental and numerical methods for determining transition shall be given.

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Section: Methodsmentioning

confidence: 99%

“…where, is the local boundary layer thickness, is the development length and is the Reynolds number based on [1]. For the calculation of the Reynolds number and are taken at the inlet.…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

On the Setup of a Test Bench for Predicting Laminar-to-Turbulent Transition on a Flat Plate

Bader¹,

Sanz²

2016

JEPE

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“…A buoyant jet is a type of fluid motion and one of basic examples of free shear flows -see Schlichting [1], Blevins [2]. It is generated by differences in fluid density.…”

Section: Introductionmentioning

confidence: 99%

PIV and LIF study of flow and thermal fields of twine plumes in water

Broučková

Trávníček

2017

EPJ Web Conf.

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Abstract. Flow and thermal fields of a pair of plane plumes in water are investigated by means of PIV and LIF experiments. The plumes are generated from thermal line sources, which are made out of electrically heated cylinders with a diameter of D = 1.21 mm. A cylinder-to-cylinder distance was 17.9 D. Either continuous or pulsating heating were used with the same heating input power. Because the cylinder-tocylinder distance is moderately small, deflections of plumes from a vertical direction occur and the plumes are inclined together. This behavior is caused by a confined entrainment from a space between the both plumes. For a continuous heating, low frequency oscillations were identified and the natural frequency was evaluated as 0.5 Hz. Based on this finding, pulsating heating was used at the subharmonic frequency of 0.25 Hz. The maximum time-mean velocity magnitude at the continuous and pulsating heating were commensurable, approximately 0.007 m/s. On the other hand, pulsating heating achieves by 36 % higher velocity peaks. A very strong velocity oscillations were generated by pulsating heating at the distance approximately 8.3 D above the cylinders, where the velocity maxima oscillate along the time-mean value of 0.0057 m/s from -30% to +70 %. Temperature fields reasonably agree with this findings, despite a relatively fast equalization of the temperature field was concluded. The results demonstrate enhancement effects of pulsations in flow/thermal fields.

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Concentrated force acting in an inviscid and incompressible parallel flow

Sparenberg

Jager

2000

Math. Meth. Appl. Sci.

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Grenzschicht-Theorie

Cited by 317 publications

References 0 publications

On the Setup of a Test Bench for Predicting Laminar-to-Turbulent Transition on a Flat Plate

On the Setup of a Test Bench for Predicting Laminar-to-Turbulent Transition on a Flat Plate

PIV and LIF study of flow and thermal fields of twine plumes in water

Concentrated force acting in an inviscid and incompressible parallel flow

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