Water flows in the channels between two aluminum plates as shown in the sketch. The ribs that form the channels are also made of aluminum and are 8-mm thick. The effective surface coefficient between all surfaces and water is 300 W/m²· K. For these conditions, how much heat is transferred at each end of each rib? How far from the lower plate is the rib temperature a minimum? What is this minimum value?

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T = 160°C T = 25°C 100 cm 8 mm T = 400°C