: pp. 46-52
Lviv Polytechnic National University
Lviv Polytechnic National University, Ukraine
Lviv Polytechnic National University
Lviv Polytechnic National University

The  structural  and  functional  diagrams  of  the  thermoanemometric  type  sensor  for measuring  the mono-  and biphasic  (liquid  +  gas) medium  by  the  pulsating  nature  of  the  flow  are  presented.  The  temperature  distribution  in  the  sensor environment is considered and the sensing elements are not in contact with the inner surface of the sensor body. On the basis of the heat balance equation, the equations were obtained to simulate the temperature of the sensing elements of the sensor, depending on the power consumption, the characteristics of material of the sensor elements, their mass and design dimensions, the thermal and technical characteristics and the kinematic parameters of the measuring environment. The results of temperature modeling of the sensing elements  for measuring  the  flow of milk and water are presented. The process of heat  flux propagation with an internal heat  source  from  the  sensing  element  of  the  sensor  with  a  cross-sectional  radius  is  considered,  described  by  the  differential equation of the intensity of the temperature propagation taking into account the thermal conductivity of the measuring medium and the material of the sensing element of the sensor. The equation for modeling the temperature at the boundary of the temperature field distribution of the sensing elements of the thermoanemometric sensor was obtained. The results of temperature modeling at the boundary of the temperature fields of sensor elements are presented. The simulation of the temperature of the sensing elements of the sensor and the distribution of the temperature field in the measuring environment is made taking into account the coefficient of  heat  transfer  of  the  sensor  elements  and  the  coefficient  of  thermal  conductivity  of  the medium. The  results  of modeling  the temperature change at the boundary of the temperature field and its distance from the elements depending on the flow velocity of the measuring medium are presented.

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