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Forced Convection Cooled Thermistors Used as Magnet Lead Flow Sensors

  • A. Morgillo
  • M. Iarocci
  • A. Nicoletti
  • Y. Farah
  • J. Sondericker
Part of the Advances in Cryogenic Engineering book series (ACRE, volume 43)

Abstract

Brookhaven National Laboratory (BNL) has developed a simple, inexpensive method for monitoring the flow, which cools the 12×50 Amp corrector power leads for the Relativistic Heavy Ion Collider (RHIC). Since there are more than 500 leads of this type distributed around the 3.8 km circumference accelerator, each requiring flow control and monitoring, the use of conventional mass flow meters is not economically feasible. The device consists of a negative temperature coefficient thermistor mounted inside a tube, through which helium gas flows from the power lead. The helium gas cools the sensor through convection causing a temperature change and therefore a resistance change in the sensor. The electrical circuit reacts by adjusting the current supplied to the sensor to maintain the resistance at a constant value. The change in current is used to calculate the helium mass flow rate. The flow meter monitors flow in the range of .03 to .05 g/s with an accuracy of plus or minus 10%. Presented here are the design calculations as well as the flow meter performance.

Keywords

Heat Transfer Nusselt Number Mass Flow Rate Brookhaven National Laboratory Entrance Length 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. [1]
    Holman, J.P., Heat Transfer, McGraw Hill, New York, 1981Google Scholar
  2. [2]
    Dewitt, David P., and Incropera, Frank P., Fundamentals of Heat and Mass Transfer, John Wiley and Sons, New York 1990.Google Scholar

Copyright information

© Springer Science+Business Media New York 1998

Authors and Affiliations

  • A. Morgillo
    • 1
  • M. Iarocci
    • 1
  • A. Nicoletti
    • 1
  • Y. Farah
    • 1
  • J. Sondericker
    • 1
  1. 1.Cryogenic Systems Group, Relativistic Heavy Ion ColliderBrookhaven National LaboratoryUptonUSA

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