Atube bank consists of 300 tubes at a distance of 6 cm between the centerlines of any two adjacent tubes. air approaches the tube bank in the normal direction at 20°c and 1 atm with a mean velocity of 6 m/s. there are 20 rows in the flow direction with 15 tubes in each row with an average surface temperature of 140°c. for an outer tube diameter of 2 cm, determine the average heat transfer coefficient. evaluate the air properties at an assumed mean temperature of 70°c and 1 atm.

answer:

clock

explanation:

always running (on) sing each hour (chime) and the clock face (front)

answer:

just reverse the digits.

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Explanation:

A massive asteroid impact would create long-term changes in the atmosphere and climate of the planet. Upon impact, vaporized dirt and rock would fill the atmosphere, blocking sunlight and creating a state of near-permanent darkness and winter-like conditions.

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Explanation:

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