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  3. . a disposable coffee cup (including a lid) may be

. A disposable coffee cup (including a lid) may be regarded as a polystyrene cylinder, diameter...

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Mechanical Engineering

. A disposable coffee cup (including a lid) may be regarded as apolystyrene cylinder, diameter 50mm, height 80mm and thickness2.5mm. The base and lid may be regarded as 2.5mm thick disks. Whenbeing held using finger tips (having a very small area) the heattransfer coefficient from the outside of the cup is 20W/m2K andfrom the coffee to the inner wall is 100W/m2K. Estimate the rate ofheat loss from the cup when the coffee is at 65oC and ambienttemperature is 18oC. The conductivity of the polystyrene is0.04W/mK.

Ans = 6.33W

Answer & Explanation Solved by verified expert
4.0 Ratings (566 Votes)
the thickness of coffee cup film t 25 mm 00025 m cylindrical surface area exposed to atmosphere A1 3145080 12560 mm2 00125 m2 Heat    See Answer
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