WEEK 10 EXAMPLE (a) Show, for a perfect gas undergoing a process between states 1 and...

 

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WEEK 10 EXAMPLE (a) Show, for a perfect gas undergoing a process between states 1 and 2, that the change in specific entropy is given by $₂$1 = ₁= R Inf ¹(2/²) - cu ln (7/2) In (b) A perfect gas undergoes an expansion from a pressure, p, to a pressure, p2 such that pv=constant. Determine an expression for the change in specific entropy of the gas in terms of the initial and final pressures and the gas constants. (c) If p₁ = 10bar and p2 = 3bar, what would be the change in the specific entropy for the isothermal process? (d) For the same pressures what would be the change in specific entropy for an adiabatic process? For air: R= 287 J/kg.K and y= 1.4 A worked solution will be released in week 11. [Answer: 345.5J/kg.K;0] WEEK 10 EXAMPLE (a) Show, for a perfect gas undergoing a process between states 1 and 2, that the change in specific entropy is given by $₂$1 = ₁= R Inf ¹(2/²) - cu ln (7/2) In (b) A perfect gas undergoes an expansion from a pressure, p, to a pressure, p2 such that pv=constant. Determine an expression for the change in specific entropy of the gas in terms of the initial and final pressures and the gas constants. (c) If p₁ = 10bar and p2 = 3bar, what would be the change in the specific entropy for the isothermal process? (d) For the same pressures what would be the change in specific entropy for an adiabatic process? For air: R= 287 J/kg.K and y= 1.4 A worked solution will be released in week 11. [Answer: 345.5J/kg.K;0]

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