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

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Abstract

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 high-speed space vehicles. Therefore, thin-film heat flux sensors (TFHFS) 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 TFHFS for transient measurements at low temperatures and for short periods. In the present work, TFHFS 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 TFHFS is tested in a dynamic convective environment. The TFHFS 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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Data availability

No datasets were generated or analysed during the current study.

Abbreviations

R:

Electrical resistance (Ω)

Ra :

Average roughness (µm)

Rh :

Resistance during heating (Ω)

Rc :

Resistance during cooling (Ω)

k:

Thermal conductivity \(\left(\mathrm W/\mathrm{mK}\right)\)

Ϲ:

Specific heat (J/kg-K)

\(\sqrt{\rho {\text{C}}k}\) :

Thermal effusivity (J/m2 s0.5 K)

T:

Temperature (K or ℃)

S:

Sensitivity (ohm/K)

r:

Coefficient of correlation

t:

Test time (s)

I:

Current supplied (A)

q:

Heat flux (W/m2)

TFGs:

Thin film gauges

TCR:

Temperature coefficient of resistance

CCS:

Constant current source

DAS:

Data acquisition system

RTD:

Resistance temperature detector

MWCNTs:

Multi-walled carbon nanotubes

TFHFS:

Thin film heat flux sensors

PTFHFS:

Platinum thin film heat flux sensors

SEM:

Scanning electron microscope

ρ:

Density (kg/m3)

β:

Angle with X-axis (o)

ᾳ:

Thermal diffusivity (m2/s)

γ:

Temperature coefficient of resistance (K−1)

Δ:

Difference

s:

Substrate

0:

Room temperature

h:

Heating

c:

Cooling

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Acknowledgements

The authors would like to acknowledge the Department of Science and Technology- Science and Engineering Research Board (DST-SERB) for their financial support in the development of thin film gauges and provision of essential experimental facilities under Project Number- ECR/2017/000260.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Visvesvaraya National Institute of Technology, Nagpur, 440010, India

    Sumedh Dongare, Trushar B. Gohil, Nidhish Agrawal & Akash Jadhav

  2. Department of Mechanical Engineering, National Institute of Technology, Warangal, Warangal, 506004, India

    Ravi K. Peetala

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  1. Sumedh Dongare
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A- Research's work. B- project idea and project supervisor. C- project supervisor. D-support of research work. E- project supervisor

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Correspondence to Ravi K. Peetala.

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Dongare, S., Peetala, R.K., Gohil, T.B. et al. Transient heat flux assessment using a platinum thin film sensor for short-duration applications. Heat Mass Transfer (2024). https://doi.org/10.1007/s00231-024-03473-0

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