Gradient Heatmetry Advances

The paper describes a unique method of heat flux measurement, i.e., gradient heatmetry. Gradient heatmetry is performed using gradient heat flux sensors (GHFS) developed on the anisotropic thermoelements basis. The principle of GHFS’ operation leads to the fact that their response time is about 10 ns, and the volt-watt sensitivity does not depend on the thickness. GHFS are compared with other types heat flux sensors, with the GHFS features depending on the materials being described. The theory and examples of gradient heatmetry applications in thermophysical experiment are provided.

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Comparison of Radiation and Convection-Based Calibration of Fast-Response Heat Flux Sensors

Volume 5: Controls, Diagnostics, and Instrumentation; Cycle Innovations; Cycle Innovations: Energy Storage ◽

10.1115/gt2020-14412 ◽

2020 ◽

Author(s):

Konstantin Huber ◽

Tim Rödiger

Keyword(s):

Heat Flux ◽

Measurement Techniques ◽

Flux Measurement ◽

Fast Response ◽

Time Signal ◽

Heat Flux Measurement ◽

Hot Air ◽

Air Jet ◽

Heat Flux Sensors ◽

Radiation Setup

Abstract In this study, the static calibration of different heat flux sensors in radiation- and convection-based procedures are compared. First, three heat flux sensors based on different principles: ALTP (based on the Transverse Seebeck Effect), HFM8E (differential-layer device) and a TG-2000 (circular-foil gage) are calibrated in a laser-based radiation setup and compared to the manufacturers calibration. In a second step, all three heat flux sensors are compared with standard temperature-based, robust heat flux measurement techniques (coaxial thermocouple and slug-calorimeter) within a newly built convection-dominated facility based on stagnation-point measurments of an impinging hot air jet. The obtained results show measurement principle depending divergences indicating that a sensitivity transfer between a radiative calibrated sensor used in a mainly convective environment is not always possible and can lead to significant, systematic errors. By comparing the time signal behavior of temperature based heat flux measurement techniques, benefits for direct heat flux measurement techniques are detected.

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The Optimization of Bimaterial Microcantilever Design for Radiant Heat Flux Measurement

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.130-134.1816 ◽

2011 ◽

Vol 130-134 ◽

pp. 1816-1820 ◽

Cited By ~ 1

Author(s):

Bing Liu ◽

Chang Fa Tao ◽

Xi Shi Wang

Keyword(s):

Heat Flux ◽

Theoretical Analysis ◽

Dynamic Response ◽

Response Time ◽

Measurement Method ◽

Flux Measurement ◽

Radiant Heat ◽

Measurement Range ◽

Radiant Heat Flux ◽

Heat Flux Measurement

This paper introduces a novel radiant heat flux measurement method based on bimaterial microcantilever. Focus on flame radiant heat flux measurement, the theoretical analysis and optimization of the bimaterial microcantilever, such as its shape, size and thickness ratio are carried out. So the dynamic response time and measurement range of flame radiant heat flux are discussed and determined.

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