Microsensors for high heat flux measurements

Hager, J. M.; Langley, Lawrence W.; Onishi, S.; Diller, Thomas E.

doi:10.2514/3.452

Cited by 25 publications

(7 citation statements)

References 8 publications

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“…Key design considerations for RTD-based heat flux sensors have been presented elsewhere [22,23]. The major design considerations for RTD-based sensors include self-heating of the sensor, sensitivity of the measurement and transient response time of the sensor.…”

Section: Design Criteriamentioning

confidence: 99%

“…This typically involves fabricating the sensors on a separate substrate and using an adhesive to bond it to the surface of interest [14][15][16]. However, an adhesive layer adds additional thermal resistance [17], potentially impacting the heat flow, the subsequent measurement, and the response time of the sensor. Alternatively, the sensor can be fabricated directly on the surface of interest, for example using sputtering techniques [18].…”

Section: Introductionmentioning

confidence: 99%

“…Sensor designs are generally categorized as using one of the following methods: transient, active heating and gradient [20]. The history, performance, design characteristics, and application of heat flux sensors in research and industry are well documented [21][22][23]. Key design considerations are presented here to provide context for the sensor reported here.…”

Section: Introductionmentioning

confidence: 99%

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Thin film heat flux sensors fabricated on copper substrates for thermal measurements in microfluidic environments

Jasperson

Schmale

et al. 2014

J. Micromech. Microeng.

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Micro-scale heat flux sensors are fabricated on bulk copper surfaces using a combination of lithography-based microfabrication and micro end milling. The heat flux sensors are designed to enable heat transfer measurements on an individual pin in a copper micro pin fin heat sink. Direct fabrication of the sensors on copper substrates minimizes the thermal resistance between the sensor and pin. To fabricate the devices, copper wafers were polished to a flatness and roughness suitable for microfabrication and standard processes, including photolithography, polyimide deposition via spinning, and metal deposition through physical vapor deposition were tailored for use on the unique copper substrates. Micro end milling was then used to create 3D pin features and segment the devices from the copper substrate. Temperature calibrations of the sensors were performed using a tube furnace and the heat flux sensing performance was assessed through laser-based tests. This paper describes the design, fabrication and calibration of these integrated heat flux sensors.

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Section: Design Criteriamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Thin film heat flux sensors fabricated on copper substrates for thermal measurements in microfluidic environments

Jasperson

Schmale

et al. 2014

J. Micromech. Microeng.

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“…Information regarding the heat flux sensor was supplied by the manufacturer. 12 This sensor is rated for temperatures up to 700uC and has a sensitivity of 150¡10 mV W -1 cm -2 . The heat flux and temperature sensors are thin films deposited by proprietary techniques onto a substrate.…”

Section: Heat Flux Sensormentioning

confidence: 99%

Measurement of heat flux at metal/mould interface during casting solidification

Sabau¹

2006

International Journal of Cast Metals Research

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In the present study, heat transfer at the metal/mould interfaces is investigated using a sensor for the direct measurement of heat flux. The heat flux sensor (HFS) was rated for 700uC and had a time response of less than 10 ms. Casting experiments were conducted using graphite moulds for aluminium alloy A356. Several casting experiments were performed using a graphite coating and a boron nitride coating. The measurement errors were estimated. The temperature of the mould surface was provided by the HFS whereas the temperature of the casting surface was measured using a thermocouple. Results for the heat transfer coefficients were obtained based on measured heat flux and temperatures. Four stages were clearly identified for the variation in time of the heat flux. Values of the heat transfer coefficient were in good agreement with data from previous studies.

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“…Most heat-flux sensors are based on one of the three following methods: (1) temperature-gradient measurement, (2) temperature-time change measurement and (3) surface heating [10][11][12][13]. Heat-flux measurement based on (2) requires intrusive techniques and sophisticated experimental design, and the surface-heating method (3) necessitates complex calculations of inversion between temperature and heat flux.…”

Section: Introductionmentioning

confidence: 99%

A new method for simultaneous measurement of convective and radiative heat flux in car underhood applications

Khaled

Garnier

Harambat

et al. 2010

Meas. Sci. Technol.

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A new experimental technique is presented that allows simultaneous measurement of convective and radiative heat flux in the underhood. The goal is to devise an easily implemented and accurate experimental method for application in the vehicle underhood compartment. The new method is based on a technique for heat-flux measurement developed by the authors (Heat flow (flux) sensors for measurement of convection, conduction and radiation heat flow 27036-2, © Rhopoint Components Ltd, Hurst Green, Oxted, RH8 9AX, UK) that uses several thermocouples in the thickness of a thermal resistive layer (foil heat-flux sensor). The method proposed here uses a pair of these thermocouples with different radiative properties. Measurements validating this novel technique are carried out on a flat plate with a prescribed constant temperature in both natural-and forced-convection flow regimes. The test flat plate is instrumented by this new technique, and also with a different technique that is intrusive but very accurate, used as reference here (Bardon J P and Jarny Y 1994 Procédé et dispositif de mesure transitoire de température et flux surfacique Brevet n • 94. 011996, 22 February). Discrepancies between the measurements by the two techniques are less than 10% for both convective and radiative heat flux. Error identification and sensitivity analysis of the new method are also presented.

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Microsensors for high heat flux measurements

Cited by 25 publications

References 8 publications

Thin film heat flux sensors fabricated on copper substrates for thermal measurements in microfluidic environments

Thin film heat flux sensors fabricated on copper substrates for thermal measurements in microfluidic environments

Measurement of heat flux at metal/mould interface during casting solidification

A new method for simultaneous measurement of convective and radiative heat flux in car underhood applications

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