Abstract
Laser-induced fluorescence (LIF) thermography has emerged as a technique for measurement of two-dimensional temperature fields with minimal intrusion. This technique has been applied in the past to convective heat transfer problems involving liquids and can provide valuable local heat transfer information in spatially non-uniform convective flows. It has also been used in high-temperature gaseous flows, including combustion chambers and shock tubes. However, LIF has scarcely been used in low-temperature convective heat transfer applications involving gases, where its sensitivity is often limited. Low temperature here refers to the range from room temperature to 100–200 °C, where most other gaseous LIF studies are classified high temperature with maxima exceeding 250 °C. This study investigates the use of LIF thermography for low-temperature gaseous convective flows, with temperatures near ambient conditions. It demonstrates the utility of LIF thermography for a wider range of low-temperature engineering applications. The fluorescence was excited with a 266 nm laser sheet using a custom-built apparatus. The relationship between toluene fluorescence intensity and temperature was validated in the temperature range 20–60 °C, which is substantially lower than in previous studies to date. The same setup was used to measure the temperature field that develops during free and forced convection around a heated cylinder. The thermographic performance of anisole, which has been used in relatively few LIF studies to date, was also investigated.
Graphic abstract
Sample images of toluene fluorescence intensity \(I\left( {x,y} \right)\) surrounding a heated cylinder for (a) \(\dot{Q} = 2.15\) W (\({\text{Ra}} = 15,200\)) and (b) \(\dot{Q} = 0\) W and \(T\left( {x,y} \right) = T_{{{\text{ref}}}} = 21\) °C. The dashed circle marks the position of the cylinder surface. Dividing image (a) by image (b) gives the (c) the normalized fluorescence intensity \(I^{*} \left( {x,y} \right) = I\left( {x,y,T} \right)/I\left( {x,y,T_{{{\text{ref}}}} } \right)\), from which the (d) temperature field \(T\left( {x,y} \right)\) can be determined.
Similar content being viewed by others
Abbreviations
- \(A_{{\text{s}}}\) :
-
Surface area of cylinder (m2)
- \(C\) :
-
Tracer molar concentration (mol/m3)
- \(D_{{{\text{cyl}}}}\) :
-
Cylinder diameter (m)
- \(h\) :
-
Heat transfer coefficient [W/(m2 K)]
- \(I\) :
-
Fluorescence intensity (W/m3)
- \(I^{*}\) :
-
Temperature-normalized fluorescence intensity
- \(I_{0}\) :
-
Laser excitation irradiance (W/m2)
- \(k\) :
-
Thermal conductivity [W/(m K)]
- \({\text{Nu}}\) :
-
Nusselt number, Nu = hDcyl/k
- \(P\) :
-
Pressure (bar)
- \({\Pr}\) :
-
Prandtl number, \({\Pr} = \nu /\alpha\)
- \(\dot{Q}\) :
-
Rate of heat transfer (by convection from cylinder) (W)
- \(\dot{q}\) :
-
Heat flux, \(\dot{q} = { }\dot{Q}/A_{{\text{s}}}\) (W/m2)
- \(R_{I}\) :
-
Signal ratio, RI = I/Ired
- \({\text{Ra}}\) :
-
Rayleigh number, \({\text{Ra}} = {\text{GrPr}} = g\beta \left( {T_{{\text{s}}} - T_{\infty } } \right)D_{{{\text{cyl}}}}^{3} /{ }\upsilon \alpha\)
- \({\text{Re}}\) :
-
Reynolds number, \({\text{Re}} = \, \left( {\rho V_{\infty } L} \right) \, /\mu = \, \left( {V_{\infty } L} \right) \, /\nu\)
- \(w_{{{\text{ans}}}} ,w_{{{\text{tol}}}}\) :
-
Mass fraction of anisole and toluene
- \(T\) :
-
Temperature (°C)
- \(T_{{\text{s}}}\) :
-
Surface temperature of copper cylinder (°C)
- \(T_{\infty }\) :
-
Free-stream temperature in flow tunnel (°C)
- \(V_{\infty }\) :
-
Free-stream velocity in flow tunnel (m/s)
- \(x\) :
-
Span-wise position (parallel to laser direction) (m)
- \(y\) :
-
Stream-wise position (parallel to gas flow) (m)
- \(z\) :
-
Camera axis direction (normal to laser sheet) (m)
- \(\alpha\) :
-
Thermal diffusivity (m2/s)
- \(\Phi\) :
-
Fluorescence quantum yield
- \(\chi_{{{\text{ans}}}} ,\chi_{{{\text{tol}}}}\) :
-
Volume fraction of anisole and toluene
- \(\lambda\) :
-
Wavelength (nm)
- \(\mu\) :
-
Dynamic viscosity (Pa s)
- \(\nu\) :
-
Kinematic viscosity (m2/s)
- \(\theta\) :
-
Angle from stagnation point of cylinder (°)
- \(\rho\) :
-
Density (kg/m3)
- \(\sigma\) :
-
Molar absorption cross section (m2/mol)
References
Coleman HW, Steele WG (2009) Experimentation, validation, and uncertainty analysis for engineers. Wiley, Hoboken
Coolen MCJ, Kieft RN, Rindt CCM, van Steenhoven AA (1999) Application of 2-D LIF temperature measurements in water using a Nd:YAG laser. Exp Fluids 27(5):420–426
Cundy M, Trunk P, Dreizler A, Sick V (2011) Gas-phase toluene LIF temperature imaging near surfaces at 10 kHz. Exp Fluids 51(5):1169–1176
Fanning E (2016) A study of heat transfer in forced convective drying with the application of laser-induced fluorescence thermometry. Ph.D. dissertation, University of Dublin, Trinity College, Dublin, Ireland
Faust S, Dreier T, Schulz C (2011) Temperature and bath gas composition dependence of effective fluorescence lifetimes of toluene excited at 266 nm. Chem Phys 383:6–11
Faust S, Tea G, Dreier T, Schulz C (2013a) Temperature, pressure, and bath gas composition dependence of fluorescence spectra and fluorescence lifetimes of toluene and naphthalene. Appl Phys B Lasers Opt 110:81–93
Faust S, Dreier T, Schulz C (2013b) Photo-physical properties of anisole: Temperature, pressure, and bath gas composition dependence of fluorescence spectra and lifetimes. Appl Phys B Lasers Opt 112:203–213
Faust S, Goschütz M, Kaiser SA, Dreier T, Schulz C (2014) A comparison of selected organic tracers for quantitative scalar imaging in the gas phase via laser-induced fluorescence. Appl Phys B 117:183–194
Fletcher DG, McDaniel JC (1987) Temperature measurement in a compressible flow field using laser-induced iodine fluorescence. Opt Lett 12(1):16–18
Ghandhi JB, Felton PG (1996) On the fluorescent behavior of ketones at high temperatures. Exp Fluids 21(2):143–144
Grossmann F, Monkhouse PB, Ridder M, Sick V, Wolfrum J (1996) Temperature and pressure dependences of the laser-induced fluorescence of gas-phase acetone and 3-penatone. Appl Phys B Lasers Opt 62:249–253
Hartfield RJ, Hollo SD, McDaniel JC (1991) Planar temperature measurement in compressible flows using laser-induced iodine fluorescence. Opt Lett 16(2):106–108
Jainski C, Lu L, Sick V, Dreizler A (2014) Laser imaging investigation of transient heat transfer processes in turbulent nitrogen jets impinging on a heated wall. Int J Heat Mass Transf 74:101–112
Kaiser SA, Schild M, Schulz C (2012) Thermal stratification in an internal combustion engine due to wall heat transfer measured by laser-induced fluorescence. In: Proceedings of the combustion institute
Kearney SP, Reyes FV (2003) Quantitative temperature imaging in gas-phase turbulent thermal convection by laser-induced fluorescence of acetone. Exp Fluids 34:87–97
Koban W, Koch JD, Hanson RK, Schulz C (2004a) Absorption and fluorescence of toluene vapor at elevated temperatures. Phys Chem Chem Phys 6(11):2940
Koban W, Koch JD, Hanson RK, Schulz C (2004b) Toluene LIF at elevated temperatures: implications for fuel-air ratio measurements. Appl Phys B 80(2):147–150
Koban W, Koch JD, Hanson RK, Schulz C (2005) Oxygen quenching of toluene fluorescence at elevated temperatures. Appl Phys B 80(6):777–784
Koch J (2005) Fuel tracer photophysics for quantitative planar laser-induced fluorescence. Report No. TSD-159, Stanford University, Stanford, CA, USA
Koch JD, Hanson RK, Koban W, Schulz C (2004) Rayleigh-calibrated fluorescence quantum yield measurements of acetone and 3-pentanone. Appl Opt 43(31):5901–5910
Lavieille P, Lemoine F, Lavergne G, Lebouché M (2001) Evaporating and combusting droplet temperature measurements using two-color laser-induced fluorescence. Exp Fluids 31(1):45–55
Lee MP, Paul PH, Hanson RK (1987) Laser-induced fluorescence of O2. Opt Lett 12(2):75–77
Lee MP, McMillin BK, Hanson RK (1993) Temperature measurements in gases by use of planar laser-induced fluorescence imaging of NO. Appl Opt 32(27):5379–5396
Löffler M, Beyrau F, Leipertz A (2010) Acetone laser-induced fluorescence behaviour for the simultaneous quantification of temperature and residual gas distribution in fired spark-ignition engines. Appl Opt 49(1):37–49
Luong M, Koban W, Schulz C (2006) Novel strategies for imaging temperature distribution using toluene LIF. J Phys Conf Ser 45:133–139
Luong M, Zhang R, Schulz C, Sick V (2008) Toluene laser-induced fluorescence for in-cylinder temperature imaging in internal combustion engines. Appl Phys B 91(3–4):669–675
McMillin BK, Lee MP, Paul PH, Hanson RK (1991) Planar laser-induced fluorescence imaging of shock-induced ignition. Symp Int Combust 23(1):1909–1914
McMillin BK, Palmer JL, Hanson RK (1993) Temporally resolved, two-line fluorescence imaging of NO temperature in a transverse jet in a supersonic cross flow. Appl Opt 32(36):7532–7545
Miller VA, Gamba M, Mungal MG, Hanson RK (2012) Two-camera dual band collection toluene PLIF thermometry in supersonic flows. In: 16th international symposium on applications of laser techniques to fluid mechanics, Lisbon, Portugal
Perkins HC, Leppert G (1964) Local heat-transfer coefficients on a uniformly heated cylinder. Int J Heat Mass Transf 7(2):143–158
Peterson B, Baum E, Böhm B, Sick V, Dreizler A (2013) High-speed PIV and LIF imaging of temperature stratification in an internal combustion engine. Proc Combust Inst 34:3653–3660
Ren M (2005) 3D flow transition behind a heated cylinder. Ph.D. dissertation, Technische Universiteit Eindhoven, Eindhoven, The Netherlands
Sakakibara J, Adrian RJ (1999) Whole field measurement of temperature in water using two-color laser induced fluorescence. Exp Fluids 26(1–2):7–15
Sanitjai S, Goldstein RJ (2004) Forced convection heat transfer from a circular cylinder in crossflow to air and liquids. Int J Heat Mass Transf 47(22):4795–4805
Seitzman JM, Kychakoff G, Hanson RK (1985) Instantaneous temperature field measurements using planar laser-induced fluorescence. Opt Lett 10(9):439–441
Seuntiëns HJ, Kieft RN, Rindt CCM, van Steenhoven AA (2001) 2D temperature measurements in the wake of a heated cylinder using LIF. Exp Fluids 31(5):588–595
Shi L, Mao X, Jaworski AJ (2010) Application of planar laser-induced fluorescence measurement techniques to study the heat transfer characteristics of parallel-plate heat exchangers in thermoacoustic devices. Meas Sci Technol 21(11):115405
Strozzi C, Sotton J, Mura A, Bellenoue M (2009) Characterization of a two dimensional temperature field within a rapid compression machine using a toluene planar laser-induced fluorescence imaging technique. Meas Sci Technol 20(12):125403
Tamura M, Luque J, Harrington JE, Berg PA, Smith GP, Jeffries JB, Crosley DR (1998) Laser-induced fluorescence of seeded nitric oxide as a flame thermometer. Appl Phys B Lasers Opt 66(4):503–510
Thurber MC, Hanson RK (2001) Simultaneous imaging of temperature and mole fraction using acetone planar laser-induced fluorescence. Exp Fluids 30(1):93–101
Thurber MC, Grisch F, Hanson RK (1997) Temperature imaging with single- and dual-wavelength acetone planar laser-induced fluorescence. Opt Lett 22(4):251–253
Thurber MC, Grisch F, Kirby BJ, Votsmeier M, Hanson RK (1998) Measurements and modeling of acetone laser-induced fluorescence with implications for temperature imaging diagnostics. Appl Opt 37(21):4963–4978
Tran KH, Morin C, Kühni M, Guibert P (2013) Fluorescence spectroscopy of anisole at elevated temperatures and pressures. Appl Phys B 115:461–470
Trunk PJ, Cundy ME, Sick V, Dreizler A (2011) 2-line toluene thermometry at 10 kHz repetition rate for temperature field measurements in a thermal boundary layer. In: 5th European combustion meeting, Cardiff, UK
Yoo JH (2011) Strategies for planar laser-induced fluorescence thermometry in shock tube flows. Ph.D. Dissertation, Stanford University, CA, USA
Yoo J, Mitchell D, Davidson DF, Hanson RK (2010) Planar laser-induced fluorescence imaging in shock tube flows. Exp Fluids 49:751–759
Zegers RPC, Yu M, Bekdemir C, Dam NJ, Luijten CCM, De Goey LPH (2013) Temperature measurements of the gas-phase during surrogate diesel injection using two-color toluene LIF. Appl Phys B Lasers Opt 112:7–23
Acknowledgements
The authors acknowledge the financial support of the Higher Education Authority (HEA) under its Programme for Research in Third-Level Institutions (PRTLI) Cycle V programme, co-funded by the European Regional Development Fund.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Fanning, E., Donnelly, T., Lunney, J.G. et al. Application of gaseous laser-induced fluorescence in low-temperature convective heat transfer research. Exp Fluids 61, 123 (2020). https://doi.org/10.1007/s00348-020-02959-x
Received:
Revised:
Accepted:
Published:
DOI: https://doi.org/10.1007/s00348-020-02959-x