Effectiveness of coaxial surface junction thermal probe for transient measurements through laser based heat flux assessment

  • Anil Kumar Rout
  • Niranjan SahooEmail author
  • Pankaj Kalita


The transient temperature measurements and subsequent prediction of heat flux are prime requirements to quantify instantaneous heat transfer characteristics in short duration unsteady flow phenomena. Coaxial surface junction thermocouples (CSJT) are efficient laboratory tools that can cater both the requirements of measuring continuous as well as instantaneous temperatures. In addition, they have the capability of fast response behaviour for the measurement of transient temperature even in harsh environments. Ease of fabrication process, robustness and cost effectiveness are some of the advantages of CSJTs over its counterparts. The present investigations mainly focus on CSJT as a potential “heat flux sensor” for short duration experiments. For this purpose, an E-type probe (3.25 mm diameter and 10 mm long) was prepared in-house. The fabrication process involves intentional plastic deformation between the two metallic thermo-elements of the probe to achieve a sensing junction of 20 μm. The characterization and quality of the sensing surface is supported through Electron Discharge X-ray (EDX) and Field Emission Scanning Electron Microscope (FESEM) studies. The probe was exposed to a continuous wave laser source of known wattage (in the range of 0.2 W–0.5 W) which acts as a source for step heat load. Transient temperatures recorded from the probe are further processed for heat flux computation through analytical and numerical methods. As a term of inference during the test window of 0.4 s, it is observed that temperature as well as heat flux values have a nice match in trend as well as magnitude with an uncertainty band of ±5%.



The authors would like to acknowledge financial support received from “Defence Research and Development Organization (DRDO), New Delhi (India)” for this experimental work.


  1. 1.
    Desikan SLN, Suresh K, Srinivasan K, Raveendran PG (2016) Fast response co-axial thermocouple for short duration impulse facilities. Appl Therm Eng 96:48–56. CrossRefGoogle Scholar
  2. 2.
    Li J, Chen H, Zhang S, Zhang X, Yu H (2017) On the response of coaxial surface thermocouples for transient aerodynamic heating measurements. Exp Thermal Fluid Sci 86:141–148. CrossRefGoogle Scholar
  3. 3.
    Agarwal S, Sahoo N, Irimpan KJ, Menezes V, Desai S (2017) Comparative performance assessments of surface junction probes for stagnation heat flux estimation in a hypersonic shock tunnel. Int J Heat Mass Transf 114:748–757. CrossRefGoogle Scholar
  4. 4.
    Alkidas AC, Cole RM (1985) Transient heat flux measurements in a divided chamber diesel engine. Trans. ASME, J. Heat Transfer 107:439–444. CrossRefGoogle Scholar
  5. 5.
    Assanis DN, Badillo E (1989) On heat transfer measurements in diesel engines using fast-response coaxial thermocouples. J Eng Gas Turbines Power 111(3):458–465. CrossRefGoogle Scholar
  6. 6.
    Hotta SK, Sahoo N, Mohanty K (2019) Ignition advancement study for optimized characteristics of a raw biogas operated spark ignition engine. International Journal of Green Energy 16(1):101–113. CrossRefGoogle Scholar
  7. 7.
    Marr MA, Wallace JS, Chandra S, Pershin L, Mostaghimi J (2010) A fast response thermocouple for internal combustion engine surface temperature measurements. Exp Thermal Fluid Sci 34(2):183–189. CrossRefGoogle Scholar
  8. 8.
    Manjhi SK, Kumar R (2019) Transient surface heat flux measurement for short duration using K-type, E-type and J-type of coaxial thermocouples for internal combustion engine. Measurement 136:256–268. CrossRefGoogle Scholar
  9. 9.
    Irimpan KJ, Mannil N, Arya H, Menezes V (2015) Performance evaluation of coaxial thermocouple against platinum thin film gauge for heat flux measurement in shock tunnel. Measurement 61:291–298. CrossRefGoogle Scholar
  10. 10.
    Mohammed H, Salleh H, Yusoff MZ (2008) Design and fabrication of coaxial surface junction thermocouples for transient heat transfer measurements. International Communications in Heat and Mass Transfer 35(7):853–859. CrossRefGoogle Scholar
  11. 11.
    Mohammed HA, Salleh H, Yusoff MZ (2010) Determination of the effusivity of different scratched coaxial temperature sensors under hypersonic flow. Int J Thermophys 31(11–12):2305–2322. CrossRefGoogle Scholar
  12. 12.
    Mohammed HA, Salleh H, Yusoff MZ (2011) The effect of scratch technique on the thermal-product value of temperature sensors. Thermophysics and Aeromechanics 18(1):51–64. CrossRefGoogle Scholar
  13. 13.
    Buttsworth DR (2001) Assessment of effective thermal product of surface junction thermocouples on millisecond and microsecond time scales. Exp Thermal Fluid Sci 25(6):409–420. CrossRefGoogle Scholar
  14. 14.
    Schultz DL, Jones T V (1973). Heat-transfer measurements in short-duration hypersonic facilities, AGARDograph-AG-165Google Scholar
  15. 15.
    Sahoo N, Kumar R (2016) Performance assessment of thermal sensors during short-duration convective surface heating measurements. Heat Mass Transf 52(9):2005–2013. CrossRefGoogle Scholar
  16. 16.
    Sanderson SR, Sturtevant B (2002) Transient heat flux measurement using a surface junction thermocouple. Rev Sci Instrum 73(7):2781–2787. CrossRefGoogle Scholar
  17. 17.
    Taler J (1996) Theory of transient experimental techniques for surface heat transfer. Int J Heat Mass Transf 39(17):3733–3748. CrossRefGoogle Scholar
  18. 18.
    Alam T, Kumar R (2018) Radiation based calibration of thin film gauge for transient measurement. Measurement 128:352361. CrossRefGoogle Scholar
  19. 19.
    Kumar R, Sahoo N, Kulkarni V (2012) Conduction based calibration of handmade platinum thin film heat transfer gauges for transient measurements. Int J Heat Mass Transf 55(9–10):2707–2713. CrossRefGoogle Scholar
  20. 20.
    Kumar R, Sahoo N (2013) Dynamic calibration of a coaxial thermocouples for short duration transient measurements. J Heat Transf 135(12):124502. CrossRefGoogle Scholar
  21. 21.
    Kumar R, Sahoo N, Kulkarni V, Singh A (2011) Laser based calibration technique of thin film gauges for short duration transient measurements. J. Thermal Sci. Eng. Appl 3(4):044504. CrossRefGoogle Scholar
  22. 22.
    Nanda SR, Agarwal S, Kulkarni V, Sahoo N (2017) Shock tube as an impulsive application device. International Journal of Aerospace Engineering 2010476:1–12. CrossRefGoogle Scholar
  23. 23.
    Mohammed HA, Salleh H, Yusoff MZ (2011) Thermal product estimation method for aerodynamics experiments. J Eng Phys Thermophys 84(4):849. CrossRefGoogle Scholar
  24. 24.
    Tropea C, Yarin AL (2007) Springer handbook of experimental fluid mechanics, vol 1. Springer Science & Business MediaGoogle Scholar
  25. 25.
    Caldwell FR (1962) Thermocouple materials. C.W. Herzfeld (Ed.), applied methods and instrument; temperature: its measurement and control in science and industry, volume 3, Part 2, Reinhold, New-York, p. 81-134Google Scholar
  26. 26.
    Mohammed HA, Salleh H, Yusoff MZ, Campo A (2010) Thermal product of type-E fast response temperature sensors. J Therm Sci 19(4):364–371. CrossRefGoogle Scholar
  27. 27.
    Touloukian YS (1970) Thermal conductivity metallic elements and alloys. Y.S. Touloukian (Ed.), Thermophysical properties of matter; TPRC data series, Vol. 1, IFI/Plenum Press, New YorkGoogle Scholar
  28. 28.
    Mohammed HA, Salleh H, Yusoff MZ (2010) Fast response surface temperature sensor for hypersonic vehicles. Instrum Exp Tech 53(1):153–159. CrossRefGoogle Scholar
  29. 29.
    Lawton B, Klingenberg G (1996) Transient temperature in engineering and science. Oxford University Press, OxfordGoogle Scholar
  30. 30.
    Agarwal S, Sahoo N, Singh RK (2016) Experimental techniques for thermal product determination of coaxial surface junction thermocouples during short duration transient measurements. Int J Heat Mass Transf 103:327–335. CrossRefGoogle Scholar
  31. 31.
    Moffat RJ (1988) Describing the uncertainties in experimental results. Exp Thermal Fluid Sci 1(1):3–17CrossRefGoogle Scholar

Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Anil Kumar Rout
    • 1
  • Niranjan Sahoo
    • 1
    Email author
  • Pankaj Kalita
    • 1
  1. 1.Centre for EnergyIndian Institute of Technology GuwahatiGuwahatiIndia

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