In the well-insulated trans-alaska pipeline, the high viscosity of the oil and long distances cause significant pressure drops, and it is reasonable to question whether flow work would be significant. consider an 50 km length of pipe of diameter 1.2 m, with oil flow rate 700 kg/s. the oil properties are 900 kg/m3, 2000 j/kg·k, 0.765 n·s/m2. calculate the pressure drop, the flow work, and the temperature rise caused by the flow work. recall from chapter 1, for steady flow, one inlet, one outlet, no heat transfer, no work, and negligible kinetic and protential energy changes, the enthalpy of the fluid remains constant. enthalpy is the sum of internal energy and flow work.