CVEN 3313 Lecture Notes - Lecture 3: Dynamic Pressure, Stagnation Pressure, Stagnation Point

• School: CU-Boulder
• Department: Civil Engineering
• Course: CVEN 3313
• Professor: John Crimaldi

Document Summary

Section 3. 05: static, stagnation, dynamic, and total pressure. Each term in the bernoulli equation can be interpreted as a form of pressure. Be(cid:396)(cid:374)oulli"s e(cid:395)uatio(cid:374) deals with stagnation and dynamic pressures. These pressures arise from the (cid:272)o(cid:374)(cid:448)e(cid:396)sio(cid:374) of ki(cid:374)eti(cid:272) e(cid:374)e(cid:396)gy i(cid:374) a flo(cid:449)i(cid:374)g fluid i(cid:374)to a (cid:862)p(cid:396)essu(cid:396)e (cid:396)ise(cid:863) as a fluid is (cid:271)(cid:396)ought to rest. I(cid:374) the p(cid:396)e(cid:448)ious se(cid:272)tio(cid:374) (cid:449)e looked at be(cid:396)(cid:374)oulli"s e(cid:395)uatio(cid:374: the first term represents the actual thermodynamic pressure of the fluid as it flows. To (cid:373)easu(cid:396)e its (cid:448)alue, o(cid:374)e (cid:272)ould (cid:373)o(cid:448)e alo(cid:374)g (cid:449)ith the fluid, like (cid:271)ei(cid:374)g (cid:862)stati(cid:272)(cid:863) (cid:396)elati(cid:448)e to the moving fluid. It is coined static pressure: the third term in the bernoulli equation is termed the hydrostatic pressure. It is not actually pressure but it represents the change in pressure due to possible potential energy variations of the fluid as a result of elevation changes: the second term is the dynamic pressure. Look at the pressure at the end of a small tube.