Hello Researchers...
I am working on a project to build liquid nitrogen (LN) transfer system with a 12V mini gear motor. I tested this with water, It works fine. But when I tested in liquid nitrogen, it didn't work. No LN flow. I don't know where the problem is. How I can fix this issue. The specifications of the motor are"
Input Voltage: DC 12V
Current: ≤0.4A
Power: 4.8W
Flow Rate: 1.8±0.1L/min
Hmax.: 5M ±5%
Maximum continuous working time: 120H
Working environment: Temperature: 5℃-40℃
Fluid temperature: 5℃-45℃
Input pressure: 0.3Mpa
Diameter: Approx. 45mm/28mm
Total length: Approx. 93mm/3.66inch
In / out hole : for 7.5mm hose
Please help me.
http://www.ebay.in/itm/DC-12V-4-8W-Motor-Tea-Pot-Tray-Mini-Gear-Water-Pump-Diameter-45mm-/122176819421?hash=item1c724e50dd:g:fYMAAOSwTA9X77Xu
I am pretty sure liquid nitrogen would fall outside of the rated fluid temperature range, at -195°C or so.
It will boil instantly on contact with anything warmer than 77K, and pumping gas in this pump will be difficult.
Depending on materials used, low temperatures could cause a lot of different problems. It can seize or break or gear can come loose from the shafts.
Hope to help,
Olof Dahlberg
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