Design and fabrication of coaxial surface junction thermocouples for transient heat transfer measurements

Mohammed, Hussein A.; Salleh, Hanim; Yusoff, Mohd Zamri

doi:10.1016/j.icheatmasstransfer.2008.03.009

Cited by 61 publications

(27 citation statements)

References 13 publications

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“…[18]). Generally temperature sensor comprises a centre post or rod composed of one of its materials which is coaxially set in and attached to the closed end of a tube composed of the second material.…”

Section: Sensors Construction A) Fabrication Techniquementioning

confidence: 99%

“…A full description of this facility is comprehensively reported in [18]. A brief description of the shock tube setup and its instrumentation is given below.…”

Section: Experimental Calibration Facilitymentioning

confidence: 99%

“…In order to identify the instantaneous heat flux history from the measured surface temperature history, it is necessary to apply a suitable experimental technique to acquire the accurate and single value of its thermal product ( ) for each particular sensor under the transient heat conduction process. All temperature sensors used in this work were constructed in our laboratory, its fabrication details is comprehensively reported in [18]. Furthermore, the calibration of each temperature sensor is essential as there will be errors up to 23% or even higher [18] if the thermophysical properties of the sensor materials are obtained from the literature [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

“…All temperature sensors used in this work were constructed in our laboratory, its fabrication details is comprehensively reported in [18]. Furthermore, the calibration of each temperature sensor is essential as there will be errors up to 23% or even higher [18] if the thermophysical properties of the sensor materials are obtained from the literature [19][20][21]. Many investigators have measured the thermal product using different techniques.…”

Section: Introductionmentioning

confidence: 99%

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Thermal Product of Fast Response Temperature Sensors for Transient Heat Transfer Applications with Numerically Determined Surface Heat Flux History

Mohammed¹,

Salleh²,

Yusoff³

2010

TOTHERJ

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Abstract:A dynamic calibration technique for evaluating the thermal product values of different scratched temperature sensors is presented. These sensors have renewable junction, fast response time and it can be used for transient heat transfer measurements in hypersonic vehicles. Two types of scratch were used, mainly abrasive papers with different grit sizes and scalpel blades with different thicknesses to form the sensor junction. The effect of scratch technique on the sensor's thermal product is investigated. The sensors were tested in shock tube facility at different operating conditions. It was observed that the thermal product of a particular sensor depends on the Mach number, surface junction scratch technique, junction location as well as on the enthalpy conditions. It was also noticed that using scalpel blade technique with a particular blade size gives consistent thermal product values. Thus, it does not require an individual calibration. However, for sensors whose junction created using abrasive paper technique with different grit sizes, a calibration for each sensor is likely to be needed. The present results have provided useful and practical data for thermal product values for different scratched temperature sensors. These data are beneficial to the experimentalists in the field and it can be used for accurate transient heat transfer rate determination. Furthermore, the present calibration technique has shown that the response time of these sensors is on the order of microseconds (less than 50 μs) and it has a rise time less than 0.3 μs. A numerical technique was used in the calculation of the heat transfer rate by developing a MATLAB routine to obtain the transient heat flux history from the measured surface temperatures history.

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Section: Sensors Construction A) Fabrication Techniquementioning

confidence: 99%

“…A full description of this facility is comprehensively reported in [18]. A brief description of the shock tube setup and its instrumentation is given below.…”

Section: Experimental Calibration Facilitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Thermal Product of Fast Response Temperature Sensors for Transient Heat Transfer Applications with Numerically Determined Surface Heat Flux History

Mohammed¹,

Salleh²,

Yusoff³

2010

TOTHERJ

Self Cite

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“…Originally developed to measure gun-bore surface temperatures [3], surface thermocouples have since been used for heat flux measurements in rocket nozzles [2,4], shock tunnels & tubes [5,6], diesel engines [7], and reentrant vehicles [8]. A recent investigation of surface thermojunction formation and the subsequent time response is given in [9].…”

Section: Introductionmentioning

confidence: 99%

Surface thermocouples for measurement of pulsed heat flux in the divertor of the Alcator C-Mod tokamak

Brunner¹,

LaBombard²

2012

Review of Scientific Instruments

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A novel set of thermocouple sensors have been developed to measure heat fluxes arriving at divertor surfaces in the Alcator C-Mod tokamak, a magnetic confinement fusion experiment. These sensors operate in direct contact with the divertor plasma, which deposits heat fluxes in excess of ~10 MW/m 2 over a ~1 second pulse. Thermoelectric EMF is produced across a non-standard bimetallic junction: a 50 µm thick 74% tungsten-26% rhenium ribbon embedded in a 6.35 mm diameter molybdenum cylinder. The unique coaxial geometry of the sensor combined with its single-point electrical ground contact minimizes interference from the plasma/magnetic environment. Incident heat fluxes are inferred from surface temperature evolution via a 1-D thermal heat transport model. For an incident heat flux of 10 MW/m 2 , surface temperatures rise ~1000 °C/s, corresponding to a heat flux flowing along the local magnetic field of ~200 MW/m 2 . Separate calorimeter sensors are used to independently confirm the derived heat fluxes by comparing total energies deposited during a plasma pulse. Langmuir probes in close proximity to the surface thermocouples are used to test plasma-sheath heat transmission theory and to identify potential sources of discrepancies among physical models.

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Exhaust Gas Flow Field Simulation of an Internal Combustion Engine for a Thermal Sensor

Agarwal

Sahoo

2016

Fluid Mechanics and Fluid Power – Contemporary Research

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Design and fabrication of coaxial surface junction thermocouples for transient heat transfer measurements

Cited by 61 publications

References 13 publications

Thermal Product of Fast Response Temperature Sensors for Transient Heat Transfer Applications with Numerically Determined Surface Heat Flux History

Thermal Product of Fast Response Temperature Sensors for Transient Heat Transfer Applications with Numerically Determined Surface Heat Flux History

Surface thermocouples for measurement of pulsed heat flux in the divertor of the Alcator C-Mod tokamak

Exhaust Gas Flow Field Simulation of an Internal Combustion Engine for a Thermal Sensor

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