Abelt moves upward at a steady velocity v, dragging a film of viscous liquid of thickness h. near the belt, the film moves upward due to no-slip. at its outer edge, the film moves downward due to gravity. aligning the y-axis with the belt movement and assuming that the only non-zero velocity is uy, with zero shear stress at the outer film edge, derive a formula for the velocity profile as a function of distance to the belt, uy(x) the average velocity uarg in the film the wall velocity vc for which there is no net flow either up or down and sketch uy/vc vs x/h.

Steel is coated with a thin layer of ceramic to protect against corrosion. what do you expect to happen to the coating when the temperature of the steel is increased significantly? explain.

Air is to be cooled in the evaporator section of a refrigerator by passing it over a bank of 0.8-cm-outer-diameter and 0.4-m-long tubes inside which the refrigerant is evaporating at -20°c. air approaches the tube bank in the normal direction at 0°c and 1 atm with a mean velocity of 4 m/s. the tubes are arranged in-line with longitudinal and transverse pitches of sl- st 1.5 cm. there are 30 rows in the flow direction with 15 tubes in each row. determine (a) the refrigeration capacity of this system and (b) pressure drop across the tube bank. evaluate the air properties at an assumed mean temperature of -5°c and 1 atm. is this a good assumption?

Manometers are good examples of measuring instruments, nowadays they are not as common as before. a)-capacitive probe gauges b)-gravitational gauges deformation ) gauges d)-digital gauges