Steady State Flow Engineering Devices

increase

do compressors increase or decrease the velocity of gases

liquids, gases

pumps and compressors are very similar, but pumps handle ______ while compressors handle _____

compressor

device used to increase the pressure of a GAS

pump

device used to increase the pressure of a LIQUID

nozzle

a device that increases the velocity of a fluid at the expense of pressure (decreases pressure)

diffuser

a device that increases the pressure of a fluid by slowing it down (decreases velocity)

diffusers

nozzles and ______ perform opposite tasks

>>

for a nozzle, V2 ____ V1 (velocity)

<<

for a diffuser, V2 ___ V1 (velocity)

velocities, kinetic

nozzles and diffusers are shaped so that they cause large changes in fluid _______ and thus _______ energies

input

compressors and pumps have/require work ______

throttle

any kind of flow-restricting device that causes a significant pressure drop in the fluid

h1 = h2

steady state energy balance equation for throttle

decrease

throttles cause a pressure __________

heat exchanger

device where two moving fluid streams exchange heat without mixing

produce, require

turbines ________ power while pumps and compressors _________ power

turbine

device that produces shaft (output) power/work

W = Q + m(h1 - h2)

steady-state energy balance equation for compressor AND compressor

h2 - h1 = (V1² - V2²)/2

steady-state energy balance equation for diffuser AND nozzle

sum(m_inh_in) = sum(m_outh_out)

steady-state energy balance equation for heat exchanger

compressor and turbine, nozzle and diffuser

what are the two sets of opposite-function devices?