(1) Water at28̥ºc (301.15 k) flow in a straight horizontal pipe in which there is no exchange of either heat or work with the surrounding. Its velocity is 14 m-1 in a pipe with an internal diameter of 2.5 cm until it flows into a section where the pipe diameter abruptly increases. What is the temperature chang̥e of the water if the downstream diameter is 3. 8 cm? If it is 7.5 cm? Whate is the maximum temperature change for an enlargement in the pipe ?
(2) Steam flows at steady state through a convering , insulated nozzle, 25 cm long and with an inlet diameter of 5 cm. at the nozzle entrance (state1).the temperature and pressure are 325ºc (598.15 k) and 700kpa,and the velocity ms- 1 . At the nozzle exit (state 2) the steam temperature and pressure are 240ºc (513.15 k) and 350 kpa . property values are
H1 =3112.5 kJ kg-1 V1= 388.61 cm3 g-1
V 2 =667.75 cm3 g-1 H2 =2945.7 kJ kg-1
What is the velocity of the steam at the nozzle exit, and what is the exit diameter?
(2) Steam flows at steady state through a convering , insulated nozzle, 25 cm long and with an inlet diameter of 5 cm. at the nozzle entrance (state1).the temperature and pressure are 325ºc (598.15 k) and 700kpa,and the velocity ms- 1 . At the nozzle exit (state 2) the steam temperature and pressure are 240ºc (513.15 k) and 350 kpa . property values are
H1 =3112.5 kJ kg-1 V1= 388.61 cm3 g-1
V 2 =667.75 cm3 g-1 H2 =2945.7 kJ kg-1
What is the velocity of the steam at the nozzle exit, and what is the exit diameter?
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