Question

Hydraulic oil is flowing through a 80 mm diameter horizontal pipe with a flow rate of 1.5 litres per -3 second. At a certain point the diameter changes to 5 cm. Assume the oil’s density is 870 kg.m . (a) Calculate the velocity in SI units through the wider diameter section of the pipe. (b) Calculate the velocity in SI units through the narrower section of the pipe. (c) What is the pressure difference between the larger and smaller sections of the pipe in Pa? A sphere of steel is heated in a furnace until it reaches a temperature of 500 °C. It is left to cool in the air at 25 °C. (d) Assuming emissivity values of 1, calculate the net heat flux from the sphere. (e) Calculate the peak wavelength of radiation from the sphere (in μm).

Answer 1