Is film condensation more effective on vertical tubes or on horizontal tubes?
What will be an ideal response?
Condensation requires heat transfer from the vapor to a cooling surface, or cool
tube. Liquids tend to be better heat conductors than vapors so that a film of
condensate will facilitate better conduction and therefore condensation,
particularly on vertical tubes or surfaces. Horizontal condenser tubes probably
are better suited to drop-wise condensation as the condensate will be small
drops and can drop away from the cooling tubes, thus allowing for cooling of
succeeding saturated vapor particles.
You might also like to view...
Conversion of Units: A football field is 120 yd long and 50 yd wide. What is the area of the football field, in square meters, given that 1.0 yd = 91.44 cm?
A. 2.4 × 103 m2 B. 3.7 × 103 m2 C. 4.2 × 103 m2 D. 5.0 × 103 m2
Fred swings a sheet of copper in pendulum fashion between the poles of a strong magnet. The sheet slows in entering the magnetic field because the field
A) induces swirling currents in the copper and accompanying magnetic fields that resist motion. B) experiences both air and magnetic friction. C) is repelled by free electrons in the copper. D) none of the above
In the Drude model of electrical conduction, the current density is directly proportional to
a. the average time interval between successive collisions. b. the number of charge carriers per unit volume. c. the square of the electron charge. d. the electric field present in the wire. e. the product of all four quantities listed above.
A person who normally weighs 700 N is riding in an elevator that is moving upward but slowing down at a steady rate. If this person is standing on a bathroom scale inside the elevator, what would the scale read?
A) more than 700 N B) less than 700 N C) 700 N D) It could be more or less than 700 N, depending on whether the magnitude of the acceleration is greater than or less than 9.8 m/s2.