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What is a Capillary Tube and how does it work?

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Nehul agrawal
What is a Capillary Tube and how does it work?

In simple words, a metal capillary tube is a narrow, cylindrical metal tube made of stainless steel, copper, or aluminum.

It has a small inner diameter ranging from a few micrometers to a few millimeters and a length ranging from a few centimeters to several meters.


Based on the principles of capillary action and fluid dynamics.Metal capillary tubes are used in many different applications, such as analytical instrumentation, refrigeration, air conditioning, and temperature sensing.


Working of capillary tubes


Metal capillary tubes are frequently used in practical applications to control the flow rate of fluids in a variety of systems, including analytical instrumentation, refrigeration, and air conditioning.


Engineers and capillary tube suppliers can precisely regulate the flow rate of a fluid in a system by selecting a capillary tube with a specific inner diameter and length.


This is accomplished by adjusting the pressure differential across the capillary tube, which affects the fluid's height in the tube and thus its flow rate.


In refrigeration systems, for example, the capillary tube is used as a metering device to control the flow rate of refrigerant from the high-pressure side to the low-pressure side.


The refrigerant enters the capillary tube at high pressure and temperature, then flows through the tube's narrow inner diameter, where it undergoes adiabatic expansion, resulting in a pressure and temperature drop.


The refrigerant then leaves the capillary tube and enters the system's low-pressure side, where it evaporates and absorbs heat.



Read more: What are the advantages of TUV solar cables?



By measuring the thermal conductivity of the metal material, the metal capillary tube can be used as a sensitive temperature sensor in temperature sensing applications.


The thermal conductivity of metal changes with temperature, and this can be measured by detecting changes in the metal's electrical resistance.


A metal capillary tube can be used as a sensitive temperature sensor by placing it in contact with the object whose temperature is being measured.


Advantages of using a metal capillary tube


Metal capillary tubes have several advantages in a variety of applications.


Precise flow control


By selecting a capillary tube with a specific inner diameter and length, metal capillary tubes allow for precise regulation of fluid flow rates.


As a result, they are well suited for use in analytical instrumentation, refrigeration, and air conditioning systems.



Low cost


When compared to other flow control devices, metal capillary tubes are a cost-effective solution for many applications.

Metal capillary tubes are strong and resistant to high pressures and temperatures, making them ideal for use in harsh environments.


Corrosion resistance

Metal capillary tubes are corrosion resistant, making them ideal for use in applications involving corrosive fluids.

Metal capillary tubes have a high thermal conductivity, which makes them suitable for use as temperature sensors.


Acquire less space

Metal capillary tubes are small and can easily be integrated into systems with limited space, making them a popular choice for many applications.


High thermal conductivity

Metal capillary tubes have a high thermal conductivity.


Wrapping up


If you are looking for a capillary tube manufacturer in Australia, then Znergy Cable will supply you with every electrical cable and capillary tube in your space.


Znergy Cable’s experts keep a bull's eye on every product during the manufacturing process because quality and specification matter most. We design and manufacture Low Voltage to High Voltage cables to Australian as well as European and American industries.

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Nehul agrawal
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