We are pumping liquid through a pipe. After a pipe length, the flow area of pipe is reduced. As per bernoulli's equation, the velocity of flow will increase and pressure will decrease. In case the pipe area is reduced to a very low value then can the decrease in pressure due to reduction in flow area result in vaporization of liquid? Is this the working principle behind expansion valves used in refrigeration industry?
Your main purpose is to decrease the pressure to its original value in order to continue the cycle of the freon in this case, so decreasing the pressure is done by either a throttling valve or a capillary tube and referring to Darcy Weisbach equation the pressure loss is increased by increasing the length and decreasing the diameter (take care that the diameter is powered by 5 in the denominator so it has a powerful effect.
I hope it could help.
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