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A ___________ consists of tightly-packed cold metal rings where heat transfer with vapour stream occurs and the vapour is condensed to its way upward.

A ___________ consists of tightly-packed cold metal rings where heat transfer with vapour stream occurs and the vapour is condensed to its way upward. Correct Answer Packed Column

The packed column can be represented as – where the hot air comes directly in contact with the substance or the cold material, which condenses the vapour and releases the dry gas from top.

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A box contains three types of rings. Four square rings, three circular rings and three hexagonal rings. 3 rings are drawn randomly. What is the probability that rings drawn contain 2 square rings?
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Heat and Thermodynamics mcq question image
A stream of air at 100 kPa pressure and 300 K is flowing on the top surface of a thin flat sheet of solid naphthalene of length 0.2 m with a velocity of 20 m/sec. The other data are: Mass diffusivity of naphthalene vapor in air = 6 * 10 –6 m2/sec Kinematic viscosity of air = 1.5 * 10 –5 m2.sc Concentration of naphthalene at the air-solid naphthalene interface = 1 * 10 – 5 kmol/m3 Calculate the overage mass transfer coefficient over the flat plate. Note: For heat transfer over a flat plate, convective heat transfer coefficient for laminar flow can be calculated by the equation. Nu = 0.664 ReL1/2 Pr1/3 you may use analogy between mass and heat transfer.