What does the Schmidt number represent?
What will be an ideal response?
The Schmidt number is a dimensionless parameter for predicting diffusion,
analogous to the Prandlt number for predicting convective heat transfer. The
Schmidt number can be visualized as the ratio of viscous forces or momentum
to the diffusivity or force of diffusion.
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If you run a complete loop around an outdoor track (400 m) in 100 s, your average speed is
A) 40000. m/s. B) 4.0 m/s. C) 4.0 km/h. D) 4.0 mph. E) 0.40 m/s.
To determine the thermal conductivity of a structural material, a large 15 cm-thick slab of the material was subjected to a uniform heat flux of 2500 W/m2 , while thermocouples embedded in the wall 2.5 cm. intervals are read over a period of time. After the system had reached equilibrium, an operator recorded the thermocouple readings shown below for two different environmental conditions
From these data, determine an approximate expression for the thermal conductivity as a
function of temperature between 40 and 208°C.
GIVEN
Thermal conductivity test on a large, 6-in.-thick slab
Thermocouples are embedded in the wall 2 in. apart
Heat flux (q/A) = 2500 W/m2
Two equilibrium conditions were recorded (shown above)
FIND
An approximate expression for thermal conductivity as a function of temperature between 40 and
2080C
ASSUMPTIONS
One dimensional conduction
SKETCH
The leading explanation for the existence of spiral arms is
A) shock waves from cyclic supernovae explosions. B) shock wave from the quasar-like eruption of the Galactic core. C) passages of spiral density waves through the interstellar medium. D) passages of massive globular clusters through the Galactic plane. E) tidal streams of small galaxies being torn up by our monster Galaxy.
A rocket engine consumes 450 kg of fuel per minute. If the exhaust speed of the ejected fuel is 5.2 km/s, what is the thrust of the rocket?
A. 42 kN B. 39 kN C. 45 kN D. 48 kN E. 35 kN