Influence Of Magnetic Field Structure On Thermal Magnetic Convection In Oxygen Concentration Sensor

Nowadays the topic of thermomagnetic convection concentration analyzer becomes very popular.Talking into consideration the fact that it has long service life,low cost,flexibility in application it can be used in coalmines,steel,petrochemical and medical industry alike.In China and abroad,topic of magnetic fluid in the magnetic field of the movement have researched by a great number of experts and scholars,but for the thermomagnetic convection oxygen concentration analyzer in the research report is also rare.For a detailed exploration of thermal-magnetic convection,we carry made an experiment by applying oxygen concentration sensor in thermal-magnetic convection phenomenon conditions.With the use of paramagnetic gas in the magnetic field caused by thermal-magnetic convection phenomenon and cause the temperature on the sensor surface changes,the oxygen concentration in gas being measured.Through paramagnetic gases,the thermomagnetic convection phenomena under the action of a magnetic field,and cause the sensor of surface temperature change,we measuring an oxygen concentration in the gas.The thermomagnetic convection mechanism of the oxygen concentration sensors research papers are not too much,especially the magnetic fields structure on its properties are not discussed.For the heat flow density and the oxygen concentration in all studies is the premise that we delve into,the two magnets of the two arrangements and four magnets of the fourth kind of arrangement,respectively,were simulated with the test,summarizes the magnetic field structure of the thermal-magnetic convection impact to oxygen concentration sensor.Innovation point is that test tube wounded by two different wires with different temperature coefficient of resistance(manganese copper wire and platinum wire)for heating the tube wall and measuring the tube wall temperature,to achieve the heating and the temperature of decoupling.An additional point is that,we turn on the tube surface of the resistance wire with high temperature insulation protection,which greatly ensure the thermal-magnetic concentration sensor works safely.The experimental procedure of thermomagnetic convection divided to three parts: preparation of the gas and heating processes,experimental measurements,subsequent analysis of the acquired data.During experiment,we also made careful arrangements on the magnetic field.This project based on the theory of the heat-transfer characteristics of thermal-magnetic convection and confirmed by actual experiment.The experimental results show that: the tube wall temperature in the magnetic field than without magnetic field significantly reduced.With stronger magnetic field,the thermal-magnetic convection phenomenon is more obvious,a different magnetic field structure of the thermal-magnetic sensor have different effects.With the rising of the thermal power,the tube within the outer tube the temperature gradient is increased,resulting in thermal-magnetic convection phenomenon is enhanced,the tube wall temperature to decrease more significantly,the thermal-magnetic phenomenon more and more obvious.To get higher strong thermal-magnetic convection phenomenon,must be given a strong external magnetic field,the larger the temperature gradient and the oxygen-containing gas with higher concentration.