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A vertical cylinder 76.2mm in diameter and 121.9mm high is maintained at 397.1K at its surface....

A vertical cylinder 76.2mm in diameter and 121.9mm high is maintained at 397.1K at its surface. It loses heat by natural convection to air at 294.3K. Heat is lost from the cylindrical side and the flat circular end at the top. Calculate the heat loss, neglecting radiation losses. Use the simplified equations of Table 1.5-2 and those equations for the lowest range of GrPr. The equivalent L use the top flat surface is 0.9 times the diameter

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Expert Solution

Calculation of heat transfer coefficient for vertical plate:

(assume air to be ideal at low pressure atmospheric and high temperature)

L= characteristic length=diameter=

putting all these values in formula we get

Heat transfer area=

Heat loss from top plate:

For side cylindrical surface heat transfer area

If the ratio, then it can be treated as a vertical plate.

It can be treated as a vertical plate.

Correlation for vertical plate

Heat loss from side surface=

Total heat Loss

Amanda K answered 1 year ago

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