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DENIUS [597]
4 years ago
10

Under which classification of convection would one expect the heat transfer con highest? a)-Forced b)-Mixed c)- Natural (or Free

)
Engineering
1 answer:
melamori03 [73]4 years ago
7 0

Answer: A) Forced

Explanation:

Forced convection is the highest heat transfer coefficient as, one of the reason is that when the hot air surrounded by the hot body are immediately removed by the air flow. In forced convection, the fluid is forced to flow over a surface or in tube  by the external factors like a pump or fan. Convection heat transfer involves with fluid motion as well as heat conduction. The highest the velocity the highest the rate of heat transfer.

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If 20 kg of iron, initially at 12 °C, is added to 30 kg of water, initially at 90 °C, what would be the final temperature of the
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final temperature of the combined system T = 84.78°C

Explanation:

Given data

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solution

we know the energy requirement formula to rise the temp

energy = mass × specific heat  × change in temperature  

we combine both system so both energy will be added

and

we know specific heat of iron ( c1 ) = 0.450 kJ/kg

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now combine both energy

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energy = 20 × 0.450  × T - 12  + 30 × 4.186 × T -90

(20)(0.45)(T−12)=(30)(4.186)(90−T)

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See the attached diagram for solution

<h2 />

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