Determine the mass transfer coefficient for the transfer of naphthalene from the pipe surface into the air in regions away from the inlet.

A.    Air at 10°C and 1 atm flows over a plane surface covered with naphthalene. The flow velocity is such that the Reynolds number at a distance of 0.6 m from the leading edge of the plate is 9 ¥ 104. Determine the average mass transfer coefficient for the transfer of napthelene over the 0.6 m length of the surface by making use of the analogy between heat and mass transfer in laminar flow along a flat plate.

 

B.    Air at 25°C and atmospheric pressure flows with a velocity of 7.6 m/s inside a 2.5 cm inner diameter pipe. The inside sur face of the tube contains a deposit of naphthalene. Determine the mass transfer coefficient for the transfer of naphthalene from the pipe surface into the air in regions away from the inlet.

Calculate the maximum achievable bridge out-of-balance voltage for an applied torque T of 103 N m given the following

Four strain gauges, with specification given below, are available to measure the torque on a cylindrical shaft 4 cm in diameter connecting a motor and load. (a) Draw clearly labelled….

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calculate the mean velocity of the gas at maximum flow rate

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