Aconcentric tube heat exchanger for cooling lubricating oil is comprised of a thin-walled inner tube of 25-mm diameter carrying water and an outer tube of 45-mm diameter carrying the oil. the exchanger operated in counterflow with an overall heat transfer coefficient of 60 w/m2∙k and the tabulated average properties.

Atank with constant volume contains 2.27 kg of a mixture of water phases (liquid-vapor). in the initial state the temperature and the quality are 127 °c and 0.6, respectively. the mixture is heated until the temperature of 160 oc is reached. illustrate the process in a t-v diagram. then, determine (1) the mass of the vapor in kg at the initial state, (2) the final pressure in kpa.

What is the major difference between thermoplastics and thermosetting plastics from the polymerization structure point of view?

When subject to a steady load (within elastic range) over a long period of time, what is the major difference in material behavoir between steel and plastic?