In the world of cryogenics, one of the most important pieces of equipment is the kryogene dewar. This device is used for the storage and transportation of cryogenic liquids, such as liquid nitrogen and liquid helium. But what exactly is a kryogene dewar, and how does it work?
A kryogene dewar is essentially a type of vacuum flask that has been specifically designed to store and transport cryogenic liquids at extremely low temperatures. The word “dewar” itself actually refers to a type of vacuum flask, named after its inventor Sir James Dewar. The kryogene dewar takes this concept one step further by adding in specialized features to accommodate the unique needs of cryogenic fluids.
The primary purpose of a kryogene dewar is to keep cryogenic liquids at their ultra low temperatures for extended periods of time. This is achieved through a combination of vacuum insulation and reflective coatings that minimize heat transfer to the interior of the flask. The inner vessel of the dewar is typically made of stainless steel or glass, while the outer vessel is made of reinforced steel or aluminum to provide added durability.
Inside the kryogene dewar, the cryogenic liquid is stored at temperatures well below its boiling point. For example, liquid nitrogen boils at -196 degrees Celsius, while liquid helium boils at an even colder -269 degrees Celsius. By keeping the liquid stored at these ultra low temperatures, the dewar ensures that it remains in a liquid state for as long as possible.
To maintain the low temperature inside the dewar, a number of additional features are often included. These can include specialized neck tubes that minimize heat transfer during pouring, as well as pressure relief valves that prevent the buildup of gas inside the flask. Some kryogene dewars also come equipped with cryogenic transfer hoses that make it easier to fill and empty the flask without exposing the liquid to warmer temperatures.
The applications for kryogene dewars are vast and varied, with industries ranging from scientific research to medical and pharmaceutical making use of these devices on a daily basis. In the world of science, kryogene dewars are commonly used for the storage and transportation of cryogenic samples and reagents. This includes everything from biological samples to superconducting materials that require ultra low temperatures to function properly.
In the medical field, kryogene dewars are often used for the storage of biological materials such as sperm and eggs for in vitro fertilization procedures. These dewars ensure that the samples remain viable for extended periods of time, allowing medical professionals to access them as needed. In addition, kryogene dewars are also used in the pharmaceutical industry for the storage of drug compounds that require cryogenic temperatures for stability.
Overall, the kryogene dewar plays a crucial role in the world of cryogenics, providing a reliable and efficient means of storing and transporting cryogenic liquids. Whether used in scientific research, medical procedures, or industrial applications, these devices are essential for maintaining ultra low temperatures over long periods of time. With their advanced insulation and specialized features, kryogene dewars are a testament to the incredible advancements that have been made in cryogenic technology.