Answer to Question #261170 in Mechanical Engineering for Tin

Question

During the execution of a reversible nonflow process, the work done is -165 kJ. If the initial volume is 0.845 cu.m. and the pressure varies as p = -730V + 690 kPaa, where V is in cu.m.

Answer 1

reversible non-flow process 

constant volume process (isochoric process)  

flow energy equation for unit mass, since no work is done, i.e. w = 0, we therefore have q = u2-u1

constant pressure process (isobaric process)  

the fluid is enclosed in a cylinder by a piston on which rests a constant, weight. if heat is supplied, the fluid expands and work is done by the system in overcoming the constant force. heat is extracted,

constant temperature process (isothermal process)

 isothermal expansion heat must be added continuously in order to keep the temperature at the initial value.

adiabatic process

an adiabatic process is the one in which heat is prevented from crossing the boundary of the system. i.e. no heat is transferred to or from the fluid during the process. that is, an adiabatic

the process is one undergone by a system that is thermally insulated from its surroundings.  

polytropic process the constant volume and constant pressure processes can be regarded as limiting cases of a more general type of process in which both the volume and pressure change, but in a certain specified manner.