A direct-measurement thin-film heat flux sensor array

Ewing, Jerrod; Gifford, Andrew R.; Hubble, David; Vlachos, Pavlos P.; Wicks, A. L.; Diller, Thomas

doi:10.1088/0957-0233/21/10/105201

Cited by 26 publications

(13 citation statements)

References 15 publications

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“…The microvolt signals from the THeTA were first amplified using custom-fabricated amplifier boards (Ewing 2006) with a fixed gain of 1000 and 480 Hz anti-aliasing filters. Post-processing of the signals from the THeTA was accomplished in MATLAB which included down sampling the data to 250 Hz to match the sampling rate of the flow measurements (discussed in § 2.4).…”

Section: O Hubble P P Vlachos and T E Dillermentioning

confidence: 99%

The role of large-scale vortical structures in transient convective heat transfer augmentation

2013

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The physical mechanism by which large-scale vortical structures augment convective heat transfer is a fundamental problem of turbulent flows. To investigate this phenomenon, two separate experiments were performed using simultaneous heat transfer and flow field measurements to study the vortex-wall interaction. Individual vortices were identified and studied both as part of a turbulent stagnation flow and as isolated vortex rings impacting on a surface. By examining the temporal evolution of both the flow field and the resulting heat transfer, it was observed that the surface thermal transport was governed by the transient interaction of the vortical structure with the wall. The magnitude of the heat transfer augmentation was dependent on the instantaneous strength, size and position of the vortex relative to the boundary layer. Based on these observations, an analytical model was developed from first principles that predicts the time-resolved surface convection using the transient properties of the vortical structure during its interaction with the wall. The analytical model was then applied, first to the simplified vortex ring model and then to the more complex stagnation region experiments. In both cases, the model was able to accurately predict the time-resolved convection resulting from the vortex interactions with the wall. These results reveal the central role of large-scale turbulent structures in the augmentation of thermal transport and establish a simple model for quantitative predictions of transient heat transfer.

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Section: O Hubble P P Vlachos and T E Dillermentioning

confidence: 99%

The role of large-scale vortical structures in transient convective heat transfer augmentation

2013

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“…In this work, calibrations were performed using radiation-based techniques that enable a more accurate sensitivity analysis and characterization of its temperature dependence [26]- [28]. Both ambient and elevated temperature calibrations were performed to quantify the steady-state sensitivity, and the time response of the sensors was measured under ambient conditions.…”

Section: B Heat Flux Sensor Calibrationmentioning

confidence: 99%

“…specifically to assess the sensitivity factor over a range of heat flux values as well as investigate any potential hysteresis effects. This system is capable of calibration only at room temperature, with further details discussed in [26].…”

Section: B Heat Flux Sensor Calibrationmentioning

confidence: 99%

High-Temperature Calibration of Direct Write Heat Flux Sensors From 25 °C to 860 °C Using the In-Cavity Radiation Method

et al. 2015

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Heat flux sensors fabricated using Direct Write Thermal Spray are thin, surface-based devices that can operate at high temperatures. In this paper, Direct Write heat flux sensors are calibrated over a temperature range of 25°C-860°C. A substitution-based quartz lamp configuration is used to measure the steady-state sensitivity and transient response of Direct Write sensors at ambient temperatures, with repeatability confirmed over a 10-month period and after thermal aging. A matched heat flow approach is used to characterize the sensors at operating temperatures up to 860°C. The sensitivity is found to increase by a factor of two from 25°C to 650°C, after which it plateaus up to the maximum tested temperature of 860°C. A cubic polynomial calibration function captures the temperature dependence of the sensitivity and provides a good agreement for the measured data.Index Terms-Heat flux, heat flux sensor, high temperature, thermal sensor, heat flow sensor, thermopile.

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“…This sensor is used Fourier's law, which for 1D steady state, to measure heat flux. Because of the small thermal conductivity and weak high-temperature tolerant of the non-metal thermal resistance, the response speed of the differential sensor is slow and the range is not wide [4,5]. Thus it affects its uses in the high-temperature explosion field.…”

Section: Introductionmentioning

confidence: 99%

The Design for Heat Flux Sensor of High Transient and Large Range in the Explosion Field

Guo¹,

KongDe-ren²,

Chen³

2016

IJSIA

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A direct-measurement thin-film heat flux sensor array

Cited by 26 publications

References 15 publications

The role of large-scale vortical structures in transient convective heat transfer augmentation

The role of large-scale vortical structures in transient convective heat transfer augmentation

High-Temperature Calibration of Direct Write Heat Flux Sensors From 25 °C to 860 °C Using the In-Cavity Radiation Method

The Design for Heat Flux Sensor of High Transient and Large Range in the Explosion Field

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