Engineering Answers

Polyester has a Young's, Modulus of 3.5 GPa and PLGA 1.2 GPa. A polymer blend is prepared with 45:55 mixture (PET:PlGA) . What is the Young's, Modulus of this blend (use mixture rule)

A 20degC water flows to 50cmx60cm flat plate with velocity of 6.5m/s . The flat plate surface temperature is maintained at 40deg C. The air flows parallel to the 50cm side of the plate. If the kinematic viscosity of water is 78x10-8 m2/s, at what length the flow become turbulent?

Fluid A with specific enthalphy 2260 kj/kg flows steadily into a mixing tank at a rate of 0.75kg/s.A second fluid B with a specific enthalphy of 160 kj/kgalsoo flows into the tank at steady rate. during mixing heat is lost to the surrounding s at 1260JK/min.If specific enthalphy of the fluid mixture flowing from the tank is 1040KJ/kj. Calculate the rate of flow of fluid B.

air enters a centrifugal compressor at 1 bar and leaves at 2.1 bar.During the passage of the air through the compressor, the compressor, the specific internal energy of the air increases by 56kj/kg and the specific volume decreases from 0.825 m^3/kh to 0.5m^3/kg.Assuming that the flow iss adiabatic and that the changes in kinetic energy are negligible, calculate the power required to drive the compressor when air flow rate is 135kg/min