Water surrounds hot horizontal tubes 3 cm in diameter in a nuclear steam generator having surface temperature of 800ºC. The water is at a pressure of 800 kPa. If film boiling is assumed, estimate the total convection heat transfer coefficient between the water and the tube surfaces.
What will be an ideal response?
Using Mathcad for the analysis here and obtaining properties of water from the saturation Appendix Table B-6 and then using Equation 10-11, Bromley’s equation, the convective heat transfer coefficient can be predicted.
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to determine the Nusselt number and heat transfer coefficient for the conditions given in.
GIVEN
• A long cylinder immersed in a fluid
• Diameter (D) = 0.1 m
• Surface temperature (Ts) = 400 K
• Fluid temperature (T?) = 350 K
FIND
The Nusselt number (Nu) and heat transfer coefficient (hc) for each fluid
SKETCH
PROPERTIES AND CONSTANTS
Explain how a photon is generated in the core of the Sun and how it is transported out from the Sun
What will be an ideal response?
The best way to find the exact distance to the Moon is to:
A) measure its exact size in the telescope. B) use radar reflection times, about 2.56 second. C) bounce lasers off the retroreflectors left on the surface by the Apollo landings. D) make parallax measurements from observatories on opposite sides of the Earth. E) use stellar occultations for precise timings of the Moon's position.
Which approach is currently proving to be the most promising way of determining how life on Earth originated?
A) studies of Martian meteorites B) studies of organisms living around deep-sea ocean vents C) studies of the fossil record D) laboratory simulations of conditions present on the early Earth