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Air enters a diffuser at 280C, 0.1 MPa and 120 m/s with a mass flow rate of 0.1 kg/s. The air leaves the duct

 

Air enters a diffuser at 280C, 0.1 MPa and 120 m/s with a mass flow rate of 0.1 kg/s. The air leaves the duct at 20 m/s and 0.2 MPa. The exit to inlet duct area ratio is 2. Find the direction and the rate of heat transfer. Assume properties of the air at room temperature.

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