A methodology to measure the thickness of a thermal boundary layer by cross correlating the signal from thermocouples is presented. It is shown that measurement of temperature, velocity, and boundary layer thickness is achievable using a single sensor utilizing three thermocouples rather than the typical two thermocouples used in the cross correlation velocimetry technique discussed in literature. The methodology is validated using experiments performed in two laboratory scale devices: a heated turbulent jet and a variable diameter natural gas burner. Experimental measurements are compared with theoretical calculations, and uncertainty in the measurement is discussed.
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