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The Effects of Forced Convection on the Power Dissipation of Constant-Temperature Thermal Conductivity Sensors

Y. Huang
H. Bau
Journal / Anthology

Transactions of the ASME
Year: 1997
Volume: 119
Page range: 30-37

The effects of forced convection on the power dissipation of cylindrical and planar, constant temperature, thermal conductivity detectors (TCDs) is investigated theoretically. Such dectectors can be used either for on-line continuous sensing of fluid thermal conductivity or for determining the sample concentrations in gas chromatographys. A low Peclet number, asymptotic theory is constructed to correlate the TCD's power dissipation with the Peclet number to explain experimental observations. Subsequently, the effect of convection on the TCD's power dissipation is calculated numerically for both time-independent flows. the theoretical predictions are compared with experimental observations.

*Engineering > Signal Processing
*Science > Physics > Thermodynamics and Statistical Mechanics