The following are regions of the boundary layer, except: viscous sublayer, buffe

Question

The following are regions of the boundary layer, except: viscous sublayer, buffer layer, inertial sublayer, potential sublayer The eddy viscosity approach replaces the need for Reynolds stresses with a need for eddy viscosity estimates The eddy viscosity is based solely on fluid properties Friction is a loss of mechanical energy to the surroundings Heat Transport The momentum boundary layer is generally thicker than the thermal boundary layer The relative thickness of the thermal and momentum boundary layers is related to the Prandtl number The time-smoothed value of VxT is: zero, VxT overbar, Vx"T' overbar, VxT overbar plus Vx'T' overbar In laminar flow, heat flow between adjacent layers of fluid is by conduction only

Explanation / Answer

Regions of Boundary Layer: No

Viscous sublayer, buffer layer and inertial sub layers are regions of boundary layer, but Potential sublayer is outside the boundary layer, so which is not a region of boundary layer.

Eddy viscosity approach replaces the needs of reynolds stress: Yes

The reynolds stresses linked to mean rate of deformation, So in turbulent viscocity we can take eddy viscocity for replacement of eddy visocity.

Eddy viscocity based solely on fluid properties: No

In turbulent flows eddy-viscosity is not a property of the fluid, but depends upon the characteristics of the flow.

Friction is a loss of mechnical energy due to its sorroundings: Yes

Def of friction is a force resisting to the relative motion of solid surfaces, fluid layers and material elements sliding each other, which is mechanical energy loss.

Momentum Boundary Layer thicker than therma boundary layer: Yes

For the cases of prandtl number>1, the momentum boundary layer is thicker than thermal boduary, except in some cases where Npr<1 for example of liquid metals the thermal is thicker than momentum bondary layers

The realtive thickness of therma and momnetum depends on prandtl number: Yes

Prandtl number = ratio of momentum diffusivity to thermal diffusivity, so relative thickness depends on Npr.

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