![]() ![]() You might therefore need a proper heat exchanger - using a long thin pipe or perhaps a metal mesh, to ensure the liquid is fully boiled. ![]() The result will be a spray of droplets mixed with gas. Droplets of liquid will remain in the stream because of the Leidenfrost effect - poor thermal contact between the droplets and the wall of the hose. If you intend for the liquid to be boiled in the hose by external heating or contact with ambient air, you may be disappointed. ![]() If this is unacceptable, you will need to boil the liquid first in a vessel or phase separator, and then pass it through the nozzle. The flow of liquid nitrogen is always always unstable and fluctuating, because it is usually impossible to prevent small amounts of boiling from generating unpredictable amounts of gas. This problem has certainly been solved in practice in a number of applications - cryosurgery, cryogenic treatment of metals, and cryogenic cooling of x-ray crystallography samples, but the approach will depend on the application. This container is a good example: /cylinder/cryo-cyl/cryo-cyl-35l-lp.html Constant volume as liquid.Įdit: If temp cannot be regulated by the pressure valve alone, then I would like to know what temp it is at, as well as the volume. Note: This is for a practical application so the answer can contain simplifying assumptions, but please list them if used. What are the equations for this process, particularly if I want to know the volume of nitrogen gas emitted from the hose at the desired temperature? There would be a phase change from liquid to gas, and then a gaseous expansion to the desired temperature that can be achieved by regulating the pressure valve. I desire a temperature above liquid but still very cold no where near room temp upon exiting the hose (T_desired or T_3). I understand that the final temperature will of course be room temperature but that is after reaching equilibrium. The requirement is that a particular temperature is reached on exit from the hose. The container has a pressure regulator so I can adjust pressure as desired. I want to take liquid nitrogen in a pressurized container and spray it through a hose onto objects in a room. ![]()
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