Abstract
This study addresses the effect of nanofluid synthesis on the rheological properties of the resulting fluid and their consequent effect on the characteristics (size and velocity distribution of droplets, spray cone angle, etc.) of the sprayed nanofluids. The results are discussed in the light of how the spray characteristics affect the use of the resulting nanofluid spray for cooling purposes. Nanoparticles of alumina (Al2O3) and zinc oxide (ZnO) are mixed in water-based solutions, for concentrations varying between 0.5% and 2 mass% for alumina and between 0.01% and 0.1 mass% for the zinc oxide particles. FeCl2·4H2O (0.1 mass%) was also used to infer on the effect of the nature (material) of the particles in the physicochemical properties of the resulting solutions. Among the various surfactants tested, citric acid (0.15%) was chosen for the final working mixtures, as it assured a stable behaviour of the solutions prepared during the entire study. The nanoparticles were characterized in detail, and the physicochemical properties of the fluid were measured before and after atomization, to evaluate any possible particle loss in the liquid feeding system or retention in the atomizer. The nanofluids were sprayed using a pressure-swirl atomizer at 0.5 MPa injection pressure. Droplet size and velocity in the spray were probed using phase Doppler anemometry. For the range of experimental conditions covered here, the results show that liquid viscosity is an important parameter in predetermining the spray characteristics of nanofluids, as it affects the primary liquid breakup. Despite this, only a mild increase is observed in the nanofluids viscosity, mainly for higher concentrations of alumina, which was not sufficient to significantly affect the spray characteristics, except for a small decrease in the spray cone angle and the size of the atomized droplets. Hence, for cooling purposes, the atomization mechanisms are not compromised by the addition of the nanoparticles and their using is beneficial, as they enhance the thermal properties without a significant deterioration of other fluid properties such as viscosity and spray characteristics. Present spray characteristics promote liquid adhesion to the cooling surfaces and droplet size and velocity are kept within a range that is appropriate for spray cooling, following the literature recommendations and our analysis.
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Abbreviations
- SCA:
-
Spray cone angle (°)
- SPAN:
-
Relative span (–)
- D 20 :
-
Surface mean diameter (μm)
- D 30 :
-
Volume mean diameter (μm)
- D 32 :
-
Sauter mean diameter (μm)
- D v0.1 :
-
10% volume diameter (μm)
- D v0.5 :
-
50% volume diameter (μm)
- D v0.9 :
-
90% volume diameter (μm)
- f :
-
Data rate (Hz)
- ID32 :
-
Integral Sauter mean diameter (μm)
- r :
-
Radial distance (mm)
- Re :
-
Reynolds number (–)
- U :
-
Axial velocity component (m s−1)
- We :
-
Weber number (–)
- w :
-
Liquid velocity at the exit orifice (m s−1)
- Z :
-
Axial distance (mm)
- µ l :
-
Liquid dynamic viscosity (kg m−1 s−1)
- ρ l :
-
Liquid density (kg m−3)
- σ l :
-
Liquid/gas surface tension (kg s−2)
References
Kim J. Spray cooling heat transfer: the state of the art. Int J Heat Fluid Flow. 2007;28(4):753–67.
Moreira ALN, Moita AS, Panão MR. Advances and challenges in explaining fuel spray impingement: How much of single droplet impact research is useful? Prog Energy Combust Sci. 2010;36:554–80.
Mahian O, Kianifar A, Kalogirou SA, Pop I, Wongwises S. A review of the applications of nanofluids in solar energy. Int J Heat Mass Transf. 2013;57:582–94.
Bostanci H, Daniel R, John K, Louis C. Spray cooling with ammonia on microstructured surfaces: performance enhancement and hysteresis effect. J Heat Transf. 2009;131:071401.
Duursma G, Sefiane K, Kennedy A. Experimental studies of nanofluid droplets in spray cooling. Heat Transf Eng. 2017;30(13):1108–20.
Das SK, Choi US, Yu W, Pradeep Y. Nanofluids: science and technology. New York: Wiley; 2008.
Buongiorno J, Venerus DC, Prabhat N, McKrell T, Townsend J, Christianson R, Tolmachev YV, Keblinski P, Hu L-W, Alvarado JL, Bang IC, Bishnoi SW, Bonetti M, Botz F, Cecere A, Chang Y, Chen G, Chen H, Chung SJ, Chyu MK, Das SK, Di Paola R, Ding Y, Dubois F, Dzido G, Eapen J, Escher W, Funfschilling D, Galand Q, Gao J, Gharagozloo PE, Goodson KE, Gutierrez JG, Hong H, Horton M, Hwang KS, Iorio CS, Jang SP, Jarzebski AB, Jiang Y, Jin L, Kabelac S, Kamath A, Kedzierski MA, Kieng GL, Kim C, Kim J-H, Kim S, Lee SH, Leong KC, Manna I, Michel B, Ni R, Patel HE, Philip J, Poulikakos D, Reynaud C, Savino R, Singh PK, Song P, Sundararajan T, Timofeeva E, Tritcak T, Turanov AN, Van Vaerenbergh S, Wen D, Witharana S, Yang C, Yeh W-H, Zhao X-Z, Zhou S-Q. A benchmark study on the thermal conductivity of nanofluids. J. Appl. Phys. 2009;106:094312.
Chen R-H, Phuoc TX, Martello D. Effects of nanoparticles on nanofluid droplets evaporation. Int J Heat Mass Transf. 2010;53:3677–82.
Mehrali M, Sadeghinezhad E, Rashidi MM, Akhiani AR, Latibari ST, Mehrali M, Metselaar HSC. Experimental and numerical investigation of the effective electrical conductivity of nitrogen-doped graphene nanofluids. J. Nanoparticle Res. 2015;17(6):267.
Hsieh S-S, Liu H-H, Yeh Y-F. Nanofluids spray heat transfer enhancement. Int J Heat Mass Transf. 2016;94:104–18.
Esfe MH, Saedodin S, Yan W-M, Afrand M, Sina N. Study on thermal conductivity of water-based nanofluids with hybrid suspensions of CNTs/Al2O3 nanoparticles. J Therm Anal Calorim. 2016;124:455–60.
Selvam C, Lal DM, Harish S. Thermal conductivity and specific heat capacity of water–ethylene glycol mixture-based nanofluids with graphene nanoplatelets. J Therm Anal Calorim. 2017;129:947–55.
Zyla G. Viscosity and thermal conductivity of MgO–EG nanofluids: experimental results and theoretical models predictions. J Therm Anal Calorim. 2017;129:171–80.
Kakaç S, Pramuanjaroenkij AA. Review of convective heat transfer enhancement with nanofluids. Int J Heat Mass Transf. 2009;52:3187–96.
Nield DA, Bejan A. Convection in Porous Media. 4th ed. New York: Springer; 2013.
Kherbeet ASh, Mohammed HA, Salman BH, Ahmed HE, Alawi OA, Rashidi MM. Experimental study of nanofluid flow and heat transfer over microscale backward- and forward-facing steps. Exp Therm Fluid Sci. 2015;65:13–21.
Shenoy A, Sheremet MA, Pop I. Flow and heat transfer past wavy surfaces: viscous fluids, porous media and nanofluids. New York: Taylor & Francis Group; 2016.
Sheikholeslami M, Ganji DD. Nanofluid convective heat transfer using semi analytical and numerical approaches: a review. J. Taiwan Inst. Chem. Eng. 2016;65:43–77.
Hosseinzadeh M, Heris SZ, Beheshti A, Shanbedi M. Convective heat transfer and friction factor of aqueous Fe3O4 nanofluid flow under laminar regime: an experimental investigation. J Therm Anal Calorim. 2016;124:827–38.
Raei B, Shahraki F, Jamialahmadi M, Peyghambarzade SM. Experimental study on the heat transfer and flow properties of c-Al2O3/water nanofluid in a double-tube heat exchanger. J Therm Anal Calorim. 2017;127:2561–75.
Akbari OA, Afrouzi HH, Marzban A, Toghraie D, Malekzade H, Arabpour A. Investigation of volume fraction of nanoparticles effect and aspect ratio of the twisted tape in the tube. J Therm Anal Calorim. 2017;129:1911–22.
Sharma AK, Tiwari AK, Dixit AR. Rheological behaviour of nanofluids: a review. Renew Sustain Energy Rev. 2016;53:779–91.
Vafaei S, Borca-Tasciuc T, Podowski MZ, Purkayastha A, Ramanath G, Ajayan PM. Effect of nanoparticles on sessile droplet contact angle. Nanotechnology. 2006;17:2523–7.
Wasan DT, Nikolov AD. Spreading of nanofluids on solids. Nature. 2003;423:156.
Chinnam J, Das DK, Vajjha RS, Satti JR. Measurements of the surface tension of nanofluids and development of a new correlation. Int J Therm Sci. 2015;98:68–80.
Jang SP, Lee J-H, Hwang KS, Choi SUS. Particle concentration and tube size dependence of viscosities of water nanofluids flowing through micro- and minitubes. Appl Phys Lett. 2007;91:243112.
Ayela F, Chevalier J. Comment on “Particle concentration and tube size dependence of viscosities of water nanofluids flowing through micro- and minitubes. [Appl. Phys. Lett. 91, 243112 (2007)]”. Appl Phys Lett. 2009;94:066101.
Singh PK, Harikrishna PV, Sundararajan T, Das SK. Experimental and numerical investigation into the hydrodynamics of nanofluids in microchannels. Exp Therm Fluid Sci. 2012;42:174–86.
Lefebvre AH, McDonell VG. Atomization and sprays. 2nd ed. London: Taylor & Francis; 2017.
Kannaiyan K, Sadr R. The effects of alumina nanoparticles as fuel additives on the spray characteristics of gas-to-liquid jet fuels. Exp Thermal Fluid Sci. 2017;87:93–103.
Teodori E, Moita AS, Pontes P, Moura M, Moreira ALN, Bai Y, Li X, Liu Y. Application of bioinspired superhydrophobic surfaces in two-phase heat transfer experiments. J Bionic Eng. 2017;14(3):506–19.
Panão MRO, Moreira ALN, Durão DFG. Thermal-fluid assessment of multijet atomization for spray cooling applications. Energy. 2011;36:2302–11.
Panão MRO, Moreira ALN, Durão DFG. Transient analysis of intermittent multijet sprays. Exp Fluids. 2012;53:105–19.
Pastrana-Martínez LM, Pereira N, Lima R, Faria JL, Gomes HT, Silva AMT. Degradation of diphenhydramine by photo-Fenton using magnetically recoverable iron oxide nanoparticles as catalyst. Chem Eng J. 2015;26:45–52.
Pereira P, Moita AS, Monteiro G, Prazeres DMF. Characterization of English weed leaves and biomimetic replicas. J Bionic Eng. 2014;11(3):346–59.
Moita AS, Teodori E, Moreira ALN. Enhancement of pool boiling heat transfer by surface micro-structuring. J Phys Conf Ser. 2012;395:012175.
Moita AS, Laurência C, Ramos JA, Prazeres DMF, Moreira ALN. Dynamics of droplets of biological fluids on smooth superhydrophobic surfaces under electrostatic actuation. J Bionic Eng. 2016;13(2):220–34.
Jedelsky J, Jicha M. Energy considerations in spraying process of a spill-return pressure-swirl atomizer. Appl Energy. 2014;132:485–95.
Manasse U, Wriedt T, Bauckhage K. Phase-Doppler sizing of optically absorbing liquid droplets: comparison between Mie theory and experiment. Part Spray Syst Charact. 1992;9(1–4):176–85.
Albrecht H-E, Borys M, Damaschke N, Tropea C. Laser Doppler and phase Doppler measurement techniques. Berlin: Springer; 2003.
Santolaya JL, García JA, Calvo E, Cerecedo LM. Effects of droplet collision phenomena on the development of pressure swirl sprays Int. J. Multiph. Flow. 2013;56:160–71.
Jedelsky J, Maly M, del Corral MO, Wigley G, Janackova L, Jicha M. Air–liquid interactions in a pressure-swirl spray. Int J Heat Mass Transf. 2018;121:788–804.
Maly M, Janackova L, Jedelsky J, Jicha M. Impact of alternative fuel rheology on spraying process of small pressure-swirl atomizer. AIP Conf Proc. 2016;1745:020031.
Lefebvre AH. The prediction of Sauter mean diameter for simplex pressure-swirl atomisers. At Spray Technol. 1987;3(1):37–51.
Yule AJ, Dunkley JJ. Atomization of melts for powder production and spray deposition. Oxford: Clarendon Press; 1994.
Moita AS, Moreira ALN. Experimental study on fuel drop impacts onto rigid surfaces: morphological comparisons, disintegration limits and secondary atomization. Proc Combust Inst. 2007;31:2175–83.
Acknowledgements
This work has been supported by the project No. 18-15839S funded by the Czech Science Foundation. The authors are also grateful to Fundação para a Ciência e Tecnologia (FCT) for partially financing the research under the framework of the project RECI/EMS-SIS/0147/2012 and for supporting M. Malý with a research fellowship, during his stage at IN+. A. S. Moita acknowledges FCT for financing her contract and exploratory research project through the recruitment programme FCT Investigator (IF 00810-2015).
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The present article is based on the lecture presented at ESNf2017 conference in Lisbon - Portugal on 8–10 October, 2017.
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Malý, M., Moita, A.S., Jedelsky, J. et al. Effect of nanoparticles concentration on the characteristics of nanofluid sprays for cooling applications. J Therm Anal Calorim 135, 3375–3386 (2019). https://doi.org/10.1007/s10973-018-7444-z
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DOI: https://doi.org/10.1007/s10973-018-7444-z