Experimental analysis of heat transfer characteristics using ultrasonic acoustic waves

In this experimental work, heat transfer intensification using ultrasonic waves was investigated. A heat source, consisting in a parallelepiped aluminum block in which two electrical heating cartridges of 160 W each were mounted to heat four liters of distilled water contained in a tank made of Plexiglas. To demonstrate the effectiveness of heat transfer enhancement with the use of ultrasounds, three different configurations were analyzed. In the first one, considered as a reference case, the heat transfer was studied without ultrasound field. In the second configuration, ultrasonic acoustic waves were generated using one transducer vibrating at a fixed frequency of 40 kHz with a total power of 60 W. In the last configuration, ultrasounds were generated with two similar transducers mounted on two opposite walls of the water tank while maintaining the same power and frequency. The effect of the distance separating the heat source to the trans-ducers on the convective heat transfer coefficients and the average temperature of the water in the tank were analyzed in detail. The results revealed that the natural convection heat transfer in the water tank was intensified by means of low frequency acoustic waves. Indeed, it was shown, particularly, that more the distance between the transducer and the heater is low more the heat transfer improvement is better. The heat transfer enhancement factor was estimated to 2.5 on the surface facing the transducer while it was only about 1.2 on the opposite surface in C2 configura-tion. In C3 configuration, the heat transfer enhancement factor is nearly the same with, however, more homogenous water temperature. The acoustic cavitation and streaming were identified as the main phenomena leading to these results. This study successfully demonstrated the feasibility of heat transfer intensification using low frequency ultrasonic waves.

Keywords:

Natural Convection, Low Frequency Ultrasound Heat Transfer Enhancement, Experimental Investigation,

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REFERENCES [1] Hamadouche A, Azzi A, Abboudi S, Nebbali R. Enhancement of heat exchanger hydraulic performance using aluminum foam. Exp Therm Fluid Sci 2018;92:1–12.
[2] Sauret OB. Étude expérimentale de l'Intensification des transferts thermiques par les ultrasons en convection force. Doctorat Dissertation. France: Université de Grenoble Alpes; 2016.
[3] Mathieson A, Cardoni A, Cerisola N, Lucas M. The influence of piezoceramic stack location on nonlinear behavior of Langevin transducers. IEEE Trans Ultrason Ferroelectr Freq Control 2013;60:11261133.
[4] Dong Z, Delacour C, Mc Carogher K, Udepurkar AP, Kuhn S. Continuous ultrasonic reactors: Design, mechanism and application. Materials (Basel) 2020;13:344.
[5] Bergles AE, Newell Jr PH. The influence of ultrasonic vibrations on heat transfer to water flowing in annuli. Int J Heat Mass Transf 1965;8:1273–1280.
[6] Monnot A, Boldo P, Gondrexon N, Bontemps A. Enhancement of cooling rate by means of high frequency ultrasound. Heat Transf Eng 2007;28:3–8.
[7] Baffigi F, Bartoli C. Influence of the ultrasounds on the heat transfer in single phase free convection and in saturated pool boiling. Exp Therm Fluid Sci 2012;36:12–21.
[8] Bartoli C, Baffigi F, Brunini A. Heat transfer enhancement by ultrasound pressure waves in liquid water: A cooling method for new electronic components. Appl Mech Mater 2014;556-562:1968–1974.
[9] Tajik B, Abbassi A, Saffar-Avval M, Abdullah A, Mohammad-Abadi H. Heat transfer enhancement by acoustic streaming in a closed cylindrical enclosure filled with water. Int J Heat Mass Transf 2013;60:230–235.
[10] Kiani H, Sun DW, Zhang Z. Effects of processing on the convective heat transfer rate during ultrasound assisted low temperature immersion treatment of a stationary sphere. J Food Eng 2013;115:3384–390.
[11] Rahimi M, Dehbani M, Abolhasani M. Experimental study on the effects of acoustic streaming of high frequency ultrasonic waves on convective heat transfer: Effects of transducer position and wave interference. Int Com Heat Mass Transf 2012;39:720–725.
[12] Tam H-K, Tam LM, Ghajar A, Chen IP. Experimental study of the ultrasonic effect on heat transfer inside a horizontal mini-tube in the laminar region. Appl Therm Eng 2017;114:1300–1308.
[13] Gondrexon N, Cheze L, Jin Y, Legay M, Tissot Q, Hengl N, et al. Intensification of heat and mass transfer by ultrasound: Application to heat exchangers and membrane separation processes. Ultrason Sonochem 2015;25:4050.
[14] Azimy H, Isfahani AHM, Farahnakian M. Investigation of the effect of ultrasonic waves on heat transfer and nanofluid stability of MWCNTs in sono heat exchanger: An experimental study. Heat Mass Transf 2022;58:467–479.
[15] Legay M, Simony B, Boldo P, Gondrexon N, Le Person S, Bontemps A. Improvement of heat transfer by means of ultrasound: Application to a double-tube heat exchanger. Ultrason Sonochem 2012;19:1194200.
[16] Mahmoud OS, Karim AMA, Yahya S, Azzawi IDJ. Miniaturized traveling-wave thermoacoustic refrigerator driven by loudspeaker: Numerical design. Int J Air Cond Refrig 2020;28:2050035.
[17] Yao Y, Zhang X, Guo Y. Experimental study on heat transfer enhancement of Water water-Shell-and-Tube heat exchanger assisted by power ultrasonic. The 13th International Refrigeration And Air Conditioning Conference at Perdue. 2010. Available at: https://docs.lib.purdue.edu/cgi/viewcontent.cgi?article=2109&context=iracc. Accessed Nov 13, 2023.
[18] Shen G, Ma L, Zhang S, Zhang S, An L. Effect of ultrasonic waves on heat transfer in Al2O3 nanofluid under natural convection and pool boiling. Int J Heat Mass Transf 2019;138:516–523.
[19] Azimy H, Isfahani AHM, Farahmakian M, Karimipour A. Experimental investigation of the effectiveness of ultrasounds on increasing heat transfer coefficient of heat exchangers. Int Commun Heat Mass Transf 2021;127:105575.
[20] Li B, Han X, Wan Z, Wang X, Tang Y. Influence of ultrasound on heat transfer of copper tubes with different surface characteristics in sub-cooled boiling. Appl Therm Eng 2016;92 93–103.
[21] Hetsroni G, Moldavsky L, Mosyak A, Fichman M. Effect of wire diameter on ultrasonic enhancement of subcooled pool boiling. 9th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics. 2012. Available at: https://repository.up.ac.za/bitstream/handle/2263/44777/Hetsroni_Effect_2014.pdf?sequence=1&isAllowed=y. Accessed Nov 13, 2023.
[22] Franco A, Bartoli C. Heat transfer enhancement due to acoustic fields: A methodological analysis. Acoustics 2019;1:281–294.
[23] Bulliard-Sauret O, Ferrouillat S, Vignal L, Memponteil A, Gondrexon N. Heat transfer enhancement using 2MHz ultrasound. Ultrason Sonochem 2017;39:262–71.
[24] Poncet C, Ferrouillat S, Vignal L, Memponteil A, Bulliard-Sauret O, Gondrexon N. Enhancement of heat transfer in forced convection by using dual low-high frequency ultrasound. Ultrason Sonochem 2021;71:105351.
[25] Moffat RJ. Describing the uncertainties in experimental results. Exp Therm Fluid Sci 1988;1:3–17.