The specific energy of a flowing fluid is defined as,

where u is the internal energy of the fluid, V is its velocity, and z is its elevation relative to an arbitrary datum. Consider a flow of low-pressure steam in a pipeline.

The steam is at a temperature of 300°F and a pressure of 50 psia. The steam is flowing at a mass flow rate of 2500 lbm/h through a pipe with an inside diameter of 11.983 in. The pipe runs horizontally at an elevation of 15 ft above the floor. The elevation of the floor is considered to be z = 0 ft. Using the property data from Appendix B.2, determine the following,

a. Specific energy of this steam flow in Btu/lbm

b. The percentage makeup of each component of the specific energy.

Transcribed Image Text:

e= U + internal energy V 2 kinetic energy + gz potential energy