Water at 25度c flow in a horizontal pipe in which there is no exchange
of either heat or work with surroundings. Its velocity is 14 m/s in a
pipe with an internal diameter of 6 cm until it flow into a section
where the pipe diameter abruptly increases.
What is the maximum temperature change for an enlargement in the pipe?
用热力学第一定律解到剩ΔH+(Δv^2/2 gc) =0
再用质量流率ρvA = ρvA来比较
后面就解不下去了