A Air at a temperature of 134°C and atmospheric pressure flows with a velocity of 7 m/s over a smooth 5 m long and 1 m wide cast iron plate. Under steady-state conditions, the air-side

surface temperature of the plates is at 120°C. Under the described conditions, determine the

overall heat transfer rate through the plate.

B-If the flat plate in (A) is replaced with a cylinder with the same surface area (heat transfer

area) and the cylinder's length is the same as the width of the plate (1.0 m), what would be the

heat transfer rate for cross air flow over the outside surface of the cylinder?

C. If the flat plate in (A) is replaced with a sphere with the same surface area (heat transfer area),

what would be the heat transfer rate for cross air flow over the outside surface of the sphere?

D- Based on your results, discuss which surface configuration is more effective for heat

dissipation and why.

most historians agree that gabriel mouton, the vicar of st. paul’s church in lyons, france, is the “founding father” of the metric system. he proposed a decimal system of measurement in 1670. mouton based it on the length of one minute of arc of a great circle of the earth (now called a nautical mile, 1852 meters). he also proposed the swing-length of a pendulum with a frequency of one beat per second as the unit of length (about 25 cm). a pendulum beating with this length would have been fairly easy to produce, thus facilitating the widespread distribution of uniform standards. over the years, his work was revised, improved, and extended by a number of french scientists.

the political sponsor of weights and measures reform in the french revolutionary national assembly was the bishop of autun, better known as talleyrand. under his auspices, the french academy appointed several committees to carry out the work of developing a usable system of weights and measures for france. one of the committees recommended a decimalized measurement system based upon a length equal to one ten-millionth of the length of a quadrant of the earth’s meridian (i.e., one ten-millionth of the distance between the equator and the north pole).

intermolecular forces are the forces between molecules or particles.

there are two kinds of van der waals forces: weak london dispersion forces and stronger dipole-dipole forces.

in molecule of water there are dipole-dipole forces between negatively charged oxygen from one molecule of water and positively charger hydrogen of another molecule of water.

hydrogen bond is an electrostatic attraction between two polar groups that occurs when a hydrogen atom (h), covalently bound to a highly electronegative atom such as flourine (f), oxygen (o) and nitrogen (n) atoms.