Boundary Layer

Fluid Mechanics - GATE-CH Questions

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GATE-CH-1998-1-9-fm-1mark

1998-1-9-fm

Boundary layer separation is characterized by one of the following conditions given below, where $Re$ is the Reynold’s number for flow. Select the appropriate conditions.

$Re ≪ 1$ , accelerating flow
$Re ≫ 1$ , accelerating flow
$Re ≪ 1$ , decelerating flow
$Re ≫ 1$ , decelerating flow

GATE-CH-2000-1-10-fm-1mark

2000-1-10-fm

In the laminar boundary layer flow over a flat plate, the ratio ( $δ / x$ ) varies as: (where $δ$ is the boundary layer thickness and $x$ is the distance from the leading edge in the direction of flow)

Re
$\sqrt{Re}$
1/Re
Re $^{- 1 / 2}$

GATE-CH-2008-12-fm-1mark

2008-12-fm

Given a pipe diameter $D$ , the entrance length necessary to achieve fully developed laminar flow is proportional to ( $Re$ is Reynolds number)

$D Re$
$D / Re$
$D {Re}^{2}$
$D / {Re}^{2}$

GATE-CH-2012-12-fm-1mark

2012-12-fm

For uniform laminar flow (in the $x$ -direction) past a flat plate at high Reynolds number, the local boundary layer thickness ( $δ$ ) varies with the distance along the plate ( $x$ ) as

$δ \propto x^{1 / 4}$
$δ \propto x^{1 / 3}$
$δ \propto x^{1 / 2}$
$δ \propto x$

[Index]

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Last Modified on: 02-May-2024

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