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A espessura de camada limite é uma proprie … A espessura de camada limite é uma propriedade das camadas limites que sofre a influência de diversos fatores e necessita para seu cálculo da obtenção de diversos parâmetros. Considere-se um corpo estacionário com um fluxo turbulento movendo em torno dele, como uma placa semi-infinita plana, com fluido que flui sobre a parte superior da placa. Nas paredes sólidas do corpo o fluido satisfaz uma condição de limite anti-deslizamento e tem uma velocidade zero, mas à medida que se afasta da parede, a velocidade do fluxo aproxima-se assintoticamente da velocidade média do fluxo livre. Por isso, é impossível definir um claro ponto em que a camada limite torna-se o fluxo livre. Os parâmetros abaixo ultrapassam esta limitação e permitem que a camada limite seja medida. Espessura da camada limite tem várias abordagens no que respeita ao seu cálculo, a mais fácil será a aplicação da equação de Von Karman ou para situações mais especificas a teoria de Blasiusações mais especificas a teoria de Blasius
, Die Impulsverlustdicke, ein Begriff der St … Die Impulsverlustdicke, ein Begriff der Strömungsmechanik (Grenzschichttheorie), ist ein Maß für die Verringerung des Impulsstroms in der Grenzschicht aufgrund des Einflusses der Reibung. Die Impulsverlustdicke ist definiert als: mit
* : Dicke der Grenzschicht
* : gemittelter Geschwindigkeitsverlauf
* : Anströmgeschwindigkeit der unendlichen Außenströmung. Als Verhältnis der Impulsverlustdicke und der Verdrängungsdicke lässt sich der Formparameter H einer Grenzschicht bestimmen:mparameter H einer Grenzschicht bestimmen:
, This page describes some of the parameters … This page describes some of the parameters used to characterize the thickness and shape of boundary layers formed by fluid flowing along a solid surface. The defining characteristic of boundary layer flow is that at the solid walls, the fluid's velocity is reduced to zero. The boundary layer refers to the thin transition layer between the wall and the bulk fluid flow. The boundary layer concept was originally developed by Ludwig Prandtl and is broadly classified into two types, bounded and unbounded. The differentiating property between bounded and unbounded boundary layers is whether the boundary layer is being substantially influenced by more than one wall. Each of the main types has a laminar, transitional, and turbulent sub-type. The two types of boundary layers use similar methods to describe the thickness and shape of the transition region with a couple of exceptions detailed in the Unbounded Boundary Layer Section. The characterizations detailed below consider steady flow but is easily extended to unsteady flow.w but is easily extended to unsteady flow.
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A espessura de camada limite é uma proprie … A espessura de camada limite é uma propriedade das camadas limites que sofre a influência de diversos fatores e necessita para seu cálculo da obtenção de diversos parâmetros. Considere-se um corpo estacionário com um fluxo turbulento movendo em torno dele, como uma placa semi-infinita plana, com fluido que flui sobre a parte superior da placa. Nas paredes sólidas do corpo o fluido satisfaz uma condição de limite anti-deslizamento e tem uma velocidade zero, mas à medida que se afasta da parede, a velocidade do fluxo aproxima-se assintoticamente da velocidade média do fluxo livre. Por isso, é impossível definir um claro ponto em que a camada limite torna-se o fluxo livre. Os parâmetros abaixo ultrapassam esta limitação e permitem que a camada limite seja medida. permitem que a camada limite seja medida.
, This page describes some of the parameters … This page describes some of the parameters used to characterize the thickness and shape of boundary layers formed by fluid flowing along a solid surface. The defining characteristic of boundary layer flow is that at the solid walls, the fluid's velocity is reduced to zero. The boundary layer refers to the thin transition layer between the wall and the bulk fluid flow. The boundary layer concept was originally developed by Ludwig Prandtl and is broadly classified into two types, bounded and unbounded. The differentiating property between bounded and unbounded boundary layers is whether the boundary layer is being substantially influenced by more than one wall. Each of the main types has a laminar, transitional, and turbulent sub-type. The two types of boundary layers use similar methods to of boundary layers use similar methods to
, Die Impulsverlustdicke, ein Begriff der St … Die Impulsverlustdicke, ein Begriff der Strömungsmechanik (Grenzschichttheorie), ist ein Maß für die Verringerung des Impulsstroms in der Grenzschicht aufgrund des Einflusses der Reibung. Die Impulsverlustdicke ist definiert als: mit
* : Dicke der Grenzschicht
* : gemittelter Geschwindigkeitsverlauf
* : Anströmgeschwindigkeit der unendlichen Außenströmung. Als Verhältnis der Impulsverlustdicke und der Verdrängungsdicke lässt sich der Formparameter H einer Grenzschicht bestimmen:mparameter H einer Grenzschicht bestimmen:
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Impulsverlustdicke
, Espessura de camada limite
, Boundary layer thickness
, 形状係数 (境界層流)
|
