The Method Based on Electromagnetic Sensor for Measuring of Sodium Flow Rate in a Heat Pipe

UDC: 
621.039.534.6

Issue of journal:

Abstract: 

The electromagnetic sensor design and method of liquid flow measuring in the vertical sodium heat pipe 100 mm diameter and 10 m length at operating temperature 550–650 С are described. The heat pipe was supplied with capillary structure only in the evaporation zone, i.e. it was a thermosyphon
with nonseparated opposite flows of liquid and vapor. Magnetic field of the sensor was produced by permanent magnet, made of thermostable alloy,
which is efficient up to 600 С. Flow measurements at three cross sections of the heat pipe, at four «points» of circumference of each section, were carried out. Significant fluctuations of the local flow rate values were observed. Maximum amplitude of the fluctuations exceeds the average value of the flow rate up to 23 times. Negative values of the local flow rate were observed. It means that liquid sodium flowed against the gravity force, and this indicates that the liquid sodium entrainment caused by vapor counterflow, the speed of which was about 80 m/s, took place.

References: 
1. Loginov N.I., Mikheev A.S. O kontseptsii isparitel'no-kondensatsionnoy sistemy avariynogo raskholazhivaniya bystrykh natrievykh reaktorov, Tezisy dokladov na otraslevoj konferentsii «Teplofizika-99», Gidrodinamika i bezopasnost' AES. Obninsk, 1999. S. 220. (in Russian)
2. Loginov N., Mikheyev A. On Concept of Heat-Pipe Emergency Core Cooling System for Fast Sodium Fission Reactors, Proceedings of the 12th International Heat pipe Conference. (Russia, 2002). P. 444
3. Sherklif Dzh. Teoriya elektromagnitnogo izmereniya raskhoda. M.: MIR, 1965. S. 138.(in Russian)
4. Loginov N.I. Elektromagnitnye preobrazovateli raskhoda zhidkikh metallov. M. Energoizdat, 1981. (in Russian)
5. Poplavskij V.M., Zabud'koA.N., Petrov E.E. i dr. Bystryj natrievyj reaktor kak istochnik teplovoj energii dlya vysoko-temperaturnykh tekhnologij, Atomnaya energiya. 2009. T. 106. Vyp. 3. S. 125-135. (in Russian)
6. Sabharwall P., Gannerson F. Engineering design elements of twophase thermosyphon for the purpose of transferring NGNP thermal energy to a hydrogen plant, Nuclear Engineering and Design. 2009. 239. Р. 2293-2301.

For full access to information log in or register here.