This represents a state of ultimate molecular order

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Unformatted text preview: ts a state of ultimate molecular order LOAD FIGURE 7–21 Disorganized energy does not create much useful effect, no matter how large it is. Wsh WEIGHT FIGURE 7–22 In the absence of friction, raising a weight by a rotating shaft does not create any disorder (entropy), and thus energy is not degraded during this process. GAS Wsh T FIGURE 7–23 The paddle-wheel work done on a gas increases the level of disorder (entropy) of the gas, and thus energy is degraded during this process. HOT BODY Heat COLD BODY 80°C 20°C (Entropy decreases) (Entropy increases) FIGURE 7–24 During a heat transfer process, the net entropy increases. (The increase in the entropy of the cold body more than offsets the decrease in the entropy of the hot body.) cen54261_ch07.qxd 11/18/03 9:57 AM Page 290 290 FUNDAMENTALS OF THERMAL-FLUID SCIENCES Pure crystal T=0K Entropy = 0 FIGURE 7–25 A pure substance at absolute zero temperature is in perfect order, and its entropy is zero (the third law of thermodynamics). (and minimum...
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This document was uploaded on 11/28/2012.

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