A sample of an ideal gas is in a fixed volume container at pressure P - by heating the gas, the average speed of molecules in the gas triples. What is the new pressure of the gas?
A. 3P
B. P/9
C. depends on the number density of the gas
D. P/3
E. 9P
E. 9P
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Reconsider the heat exchanger and explore the effect of tube center-to- center spacing in the equilateral array of the finned tubes. Consider the tube spacing of 8.75 cm and 10 cm. What is the extent of change in the average heat transfer coefficient and pressure drop? Likewise, what is the extent of change in the thermal and hydrodynamic performance if a square pitch (inline arrangement is considered) with tube center-to-center spacing of 7.5 cm?
GIVEN
Heated air flowing over an equilateral staggered tube bank
Exhaust gas temperature
Tair,in = 400°C
Number of tube rows (NL) = 10
Tube diameter (D) = 2.5 cm= 0.025 m
Center to center pitch(S) = 7.5 cm=0.075 m
Free stream velocity (Ua) = 2 m/s
Tube surface temperature (Tt) = 175°C
Finned surface extension ration (?)= 1.15
FIND
The average heat transfer coefficient (c h) and pressure drop in gas flow stream.
ASSUMPTIONS
Steady state
Tube wall temperature is uniform and constant
SKETCH
A proton is moving at a speed of 3.2 × 106 m/s at an angle of 80° to a uniform magnetic field of strength 1.5 × 10-4 T
What is the distance moved by the proton along the spiral path as it completes one revolution? (This distance is called the "pitch" of the helix.) A) 1370 m B) 1390 m C) 240 m D) 220 m E) cannot be determined
What two factors can change a rock's melting point?
What will be an ideal response?
A bomb blast sends a shock wave through the 20°C atmosphere. At a certain location, the shock wave is travelling at M = 3. The induced velocity behind the wave is nearest:
(A) 760 m/s (B) 620 m/s (C) 540 m/s (D) 410 m/s