Fast response co-axial thermocouple for short duration impulse facilities

Desikan, S. L. N.; Suresh, K.; Srinivasan, Karthik; Raveendran, P.G.

doi:10.1016/j.applthermaleng.2015.11.074

Cited by 34 publications

(6 citation statements)

References 10 publications

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“…Additionally, q loss is the heat flux transferred from the calorimeter element to the backing material, namely, the heat flux rate lost from the CVD diamond. q loss is calculated from Equation (11) and is brought into Equation (12). We also define the correction coefficient ξ of the transient calorimeter as:…”

Section: Theory Of Dynamic Correctionmentioning

confidence: 99%

“…In such facilities, where the effective test time is on the order of milliseconds, the heat flux rate is derived from the transient temperature monitored at selected points on the model with fast response testing technology. Generally, the techniques can be divided into two categories; the first is based on heat flux sensors, such as resistance thermometers [5][6][7][8], thermocouples [9][10][11][12][13], and calorimeters [14][15][16][17], and the second is based on non-intrusive techniques such as temperature-sensitive paint [18,19] and thermography [20,21]. However, each technique has its own benefits and challenges.…”

Section: Introductionmentioning

confidence: 99%

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A Fast-Response Calorimeter with Dynamic Corrections for Transient Heat Transfer Measurements

Zhang

Wang

et al. 2020

Applied Sciences

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Robust fast-response transient calorimeters with novel calorimeter elements have attracted the attention of researchers as new synthetic materials have been developed. This sensor uses diamonds as the calorimeter element, and a platinum film resistance is sputtered on the back to measure the temperature. The surface heat flux is obtained based on the calorimetric principle. The sensor has the advantages of high sensitivity and not being prone to erosion. However, non-ideal conditions, such as heat dissipation from the calorimeter element to the surroundings, can lead to measurement deviation and result in challenges for sensor miniaturization. In this study, a novel transient calorimeter (NTC) with two different sizes was developed using air or epoxy as the back-filling material. Numerical simulations were conducted to explain the complex heat exchange between the calorimeter element and its surroundings, which showed that it deviated from the assumption of an ideal calorimeter sensor. Accordingly, a dynamic correction method was proposed to compensate for the energy loss from the backside of the calorimeter element. The numerical results showed that the dynamic correction method significantly improved the measurement deviation, and the relative error was within 2.3% if the test time was smaller than 12 ms in the simulated cases. Detonation shock tunnel experiments confirmed the results of the dynamic correction method and demonstrated a practical method to obtain the dynamic correction coefficient. The accuracy and feasibility of the dynamic correction method were verified in a single detonation shock tunnel and under shock tube conditions. The NTC calorimeter exhibited good repeatability in all experiments.

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Section: Theory Of Dynamic Correctionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Fast-Response Calorimeter with Dynamic Corrections for Transient Heat Transfer Measurements

Zhang

Wang

et al. 2020

Applied Sciences

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“…al. [19][20][21][22] The TFHFS on a Pyrex substrate has been fabricated by annealing heat treatment at 650 ℃, and radiative and conductive modes have been used to calibrate them. In certain experiments, it was found that the heat flux recovery had very little variance, approximately 2%.…”

Section: Introductionmentioning

confidence: 99%

Transient heat flux assessment using a platinum thin film sensor for short-duration applications

Dongare,

Peetala,

Gohil

et al. 2024

Heat Mass Transfer

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The rapid fluctuations in heat transfer rates make it challenging to determine the surface temperature history and the estimation of accurate heat generation in research applications such as IC engines, gas turbines, and highspeed space vehicles. Therefore, thin-film gauges (TFGs) are generally used to measure the heat flux in such applications due to their high sensitivity and quick response time. The present study demonstrates that increasing the annealing heat treatment temperature, will enhance the adhesion of the thin film and the capabilities of these hand-made thin-film gauges for transient measurements at low temperatures and for short periods. In the present work, TFG is fabricated in-house using platinum as a sensing element and Macor as an insulating substrate. The sensitivity (S) and temperature coefficient of resistance (TCR) are estimated using an oil batch calibration technique. At the same time, the performance of TFG is tested in a dynamic convective environment. The TFG is exposed to the convective environment using a designed calibration set-up, and their transient heat fluxes are computed by conducting several trials. Additionally, the numerical solution has been accomplished using various experimental parameters. In comparison to the outcomes of the experimental method, it is observed that the average fluctuating temperature and mean surface heat flux have an inaccuracy of 0.33% and 4.17% respectively.

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“…With this stringent requirement, low response time thermal sensor remains the primary need. In general, TFHFSs [2][3][4], temperature sensitive paints [5,6], calorimeter gauges [7] and co-axial thermocouples [8][9][10] are used for temperature and further for heat flux measurement. The TFHFSs are conventionally preferred as these sensors have very small response time and can be used for various applications.…”

Section: Introductionmentioning

confidence: 99%

Multi-walled carbon nano-tubes for performance enhancement of thin film heat flux sensors

2019

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Surface heat transfer measurement is an important aspect in many research problems. Thin film heat flux sensor (TFHFS) is mostly considered in such situations for heat flux measurement due to its quick response and high accuracy. In the present studies, multi-walled carbon nanotubes (MWCNTs) are mixed with platinum while making the TFHFSs. Such addition is noticed to increase the sensitivity and decrease the temperature coefficient of resistance (TCR) of the thin film sensors. Improved sensitivity by 151% and 119% for Macor and Quartz sensors has led to increase in strength of the temperature response of the sensors during dynamic calibration experiments. Though heat flux recovery is seen to have encouraging agreement for all the sensors, sensitivity enhancement is noticed to be more prominent and advantageous for Macor based sensors. Present studies recommend adequately finished substrate for better adhesion. Further, use of MWCNTs is advisable especially for low heat flux measurement and also for Macor substrate since either situation demands the higher sensitivity to increase the output response.

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Fast response co-axial thermocouple for short duration impulse facilities

Cited by 34 publications

References 10 publications

A Fast-Response Calorimeter with Dynamic Corrections for Transient Heat Transfer Measurements

A Fast-Response Calorimeter with Dynamic Corrections for Transient Heat Transfer Measurements

Transient heat flux assessment using a platinum thin film sensor for short-duration applications

Multi-walled carbon nano-tubes for performance enhancement of thin film heat flux sensors

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