Veterinary Andrology and Reproductive Techniques

STRUCTURE OF LIQUID NITROGEN CONTAINER

• A liquid nitrogen container is a double layered vessel namely outer chamber and inner chamber.
• The outer chamber covers the ovar all parts of the container. The inner chamber is suspended into the outer chamber through the neck.
• The wall of inner chamber is made of high quality insulating material and is bad conductor of heat.
• Vaccum is created between outer and inner chamber and the space inbetween is filled with insulating material.
• If the vaccum is broken, the liquid nitrogen will boil and there would be rapid loss of liquid nitrogen from the inner chamber.
• The inner vessel is connected with the outer vessel with glue and it is not supported by a strong welding.
• Hence the neck is the weakest part of the whole referigerator and sudden tipping on one side will cause damage to the neck.
• The neck region prevents the exchange of heat from outside to inner chamber and therby the fast evaporation of liqid nitrogen is prevented.
• The addition of liqid nitrogen to the container leads to considerable increase in wight load which should be supported by the neck tube.
• The sudden moves and jerks will cause the vibration of the inner chamber.
• The side movement of the inner chamber will leads to the damage to the neck tube and causes mechanical damage.
• Liquid nitrogen refrigerators are constructed in such a way the three pathways of heat transfer, conduction, convection and radiation are mininmized.
• The super vaccum between the chambers prevents the transfer of heat through conduction and convection.

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