What is the capillary effect and explain its cause? how is it affected by the contact angle? a small-diameter tube is placed into a liquid whose contact angle is 110°. will the level of liquid in the tube be higher or lower than the level of the rest of the liquid? explain.

Explain the difference laminar and turbulent flow. explain it with the shear stress and the velocity profiles.

Condition monitoring is a major component of. (clo4) a)- predictive maintenance. b)-preventive maintenance c)-proactive maintenance d)-reactive maintenance.

Along 8-cm diameter steam pipe whose external surface temperature is 900c connects two buildings. the pipe is exposed to ambient air at 70c with a wind speed of 50 km/hr blowing across the pipe. determine the heat loss from the pipe per unit length. (b) air at 500c enters a section of a rectangular duct (15 cm x 20 cm) at an average velocity of 7 m/s. if the walls of the duct are maintained at 100c. a) the length of the tube for an exit temperature of the air to be 40 0c. b)the rate of heat transfer from the air. c) the fan power needed to overcome the pressure drop in this section of the duct.