当前位置: Home / Faq / Air separation parts FAQ /

What is throttling and why the fluid temperature generally decreases after throttling

What is throttling and why the fluid temperature generally decreases after throttling
Feb 02, 2023
Author: DEAR AST

When gas or liquid flows through a shrinkage hole or a valve in the pipeline, the flow is blocked, and the fluid will generate vortex, collision and friction at the valve, and the fluid will flow through the valve. This process of pressure drop due to local resistance of flow is usually called "throttling process".

In the throttling process, the fluid neither outputs external work, but also can be regarded as an adiabatic process without heat exchange with the outside. According to the law of energy conservation, the total energy (enthalpy) inside the fluid before and after throttling should remain unchanged. However, each of the three parts of energy that make up the enthalpy: kinetic energy of molecular motion, potential energy of molecular interaction, and flow energy can change. After throttling, the pressure decreases, the mass specific volume increases, the distance between molecules increases, and the potential energy of molecular interaction increases. The flow energy generally does not change much, so it can only be converted into potential energy by reducing the kinetic energy of molecular motion. The movement speed of molecules slows down, which is reflected in the reduction of temperature. In the air separation plant, throttling is the same situation, which is also the purpose of throttling cooling refrigeration.

DEAR Air Force has a professional technical team to provide users with high-quality and advanced design services.

DEAR Air Separation Solve YourWhat is throttling and why the fluid temperature generally decreases after throttlingYou can also learn about otherAir separation parts FAQ about DEAR Air Separation, and solve the problem for you.
Didn’t find the problem encountered?
Please contact live chat or email for quick help.
Related FAQ
More Related FAQ
Membrane separation is a technology that uses separation membranes as the core for the selective separation, concentration and purification of substances. The basic principle is to use the different rates of dissolution and diffusion of each gas component in the separation membrane at a certain pressure, and therefore the different rates of permeation through the fibre membrane walls due to the partial pressure d...
2025.06.06
The liquid oxygen pump is a kind of low temperature liquid pump. It is used as the liquid oxygen circulating pump in the main condensing evaporator in the internal compressed air separation process to increase the pressure of liquid oxygen and output liquid oxygen.
2025.06.05
Need more information?
Contact us for more details about our air separation equipment, solutions and services.
Products
  • Large air separation
  • Small air separation
  • High purity nitrogen air separation
  • Liquefaction air separation
  • Complete air separation
  • Biogas purification
  • Air separation parts
Need more information?
Tel:+86-19837850537
© Kaifeng DEAR Air Separation Industry Co., Ltd.. All rights reserved.
Online
Inquiry
Email
Top