Water is to be condensed at 1 atmosphere pressure in a compact heat exchanger having vertical stainless steel plates at 40ºC. Plot the condensation boundary layer thickness flowing down the vertical surface as a function of the distance down the plate, assuming laminar flow. At what point would you assume the condensate flow to become turbulent?
What will be an ideal response?
Assuming laminar flow of condensate down a vertical surface, Equation 10-34 may be
used to predict the condensate thickness.
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Mercury's _______________ are marked by meteorite craters less than 15 km in diameter, in addition to secondary craters
Fill in the blank(s) with correct word
If the density of the Universe is less than the critical density, then
A. the Universal expansion will eventually stop sometime in the future. B. the Universe will eventually stop expanding, and then begin to collapse until it ends in a Big Crunch. C. the Universe will not change because its evolution does not depend on the critical density. D. the Universe will expand forever.
The Eiffel tower in Paris is 300 meters tall on a cold day (T = – 5 degrees Celsius). What is its height on a hot day when the temperature is 35 degrees? (It is made of iron which has a coefficient of linear expansion of 0.000012 per degree Celsius.)
Unpolarized light passes through three polarizing filters. The first one is oriented with a horizontal transmission axis, the second filter has its transmission axis 25.7° from the horizontal,
and the third one has a vertical transmission axis. What percent of the light gets through this combination of filters? A) 7.6% B) 50.0% C) 92.4% D) 0.00%