1

### GATE ME 2001

Water (Prandtl number $=6$ ) flows over a flat plate which is heated over the entire length. Which one of the following relationship between the hydrodynamic boundary layer thickness $\left( \delta \right)$ and thermal boundary layer thickness $\left( {{\delta _t}} \right)$ is true
A
${\delta _t} = \delta$
B
${\delta _t} < \delta$
C
${\delta _t} > \delta$
D
can not be predicted
2
Subjective

### GATE ME 1996

Match List - ${\rm I}$ with List - ${\rm II}$ and select the correct answer using the code given below the Lists:

List - ${\rm I}$
$A.$ Grashof number
$B.$ Schmid number
$C.$ Weber number
$D.$ Fourier number

List - ${\rm II}$
$1.$ Mass diffusion
$2.$ Transient heat conduction
$3.$ Free convection
$4.$ Forced convection
$5.$ Surface tension
$6.$ Radiation

$A - 3,\,\,B - 1,\,\,C - 5,\,\,D - 2$
3

### GATE ME 1992

A fluid flowing over a flat plate has the following properties: dynamic viscocity $= 25 \times {10^{ - 6}}\,\,kg/ms,$ specific heat $=2.0$ $kJ/kgK,$ thermal conductivity $0.05W/mK.$ The hydrodynamic boundary layer thickness is measured to be $0.5$ $mm.$ The thickness of the thermal boundary layer would be
A
$0.1mm$
B
$0.5mm$
C
$1.0mm$
D
none

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