EXPERIMENTAL STUDY ON THE PHENOMENA ON THE SUCCESSIVE DROPLETS IMPACTING HOT COPPER SURFAC

Arif Widyatama; Akmal Irfan Majid; Teguh Wibowo; Deendarlianto Deendarlianto; Samsul Kamal

doi:10.21831/jps.v24i2.26923

EXPERIMENTAL STUDY ON THE PHENOMENA ON THE SUCCESSIVE DROPLETS IMPACTING HOT COPPER SURFAC

Arif Widyatama, epartemen Teknik Mesin dan Industri, Universitas Gadjah Mada
Akmal Irfan Majid, Departemen Teknik Mesin dan Industri, Universitas Gadjah Mada
Teguh Wibowo, Departemen Teknik Mesin, Sekolah Tinggi Teknologi Adisutjipto
Deendarlianto Deendarlianto, Pusat Studi Energi, Universitas Gadjah Mada
Samsul Kamal, epartemen Teknik Mesin dan Industri, Universitas Gadjah Mada

10.21831/jps.v24i2.26923

Abstract

This study was aimed at investigating the phenomena and interactions between water droplets and hot metal surfaces using an experimental method. In this study, the droplet was dropped from 50 mm from the top of the metal surface with a frequency of 8.5 droplets per second. The observed droplet diameter was 3.12 mm. The metal used was copper with a surface temperature between 110-240 ° C. High speed video camera with a speed of 2000 fps was used to record visual data. Then the image processing technique was applied to calculate the change in droplet diameter. The results show that at low temperatures, droplets tend to maintain their initial position of contact with fluctuating deformations. While at high temperatures, a bounce phenomenon occurs which results in collisions between droplets being imperfect. Visualization results can reveal the complete change in the droplet geometry in the form of spreading ratio and complete apex height. The temperature of 140° C is the initial transition area for phenomena that result in droplets has no contact with hot surfaces so that the process of heat transfer between surfaces is inhibited.

STUDI EKSPERIMEN PADA FENOMENA SUCCESSIVE DROPLETS MENUMBUK PERMUKAAN TEMBAGA PANAS

Penelitian ini bertujuan untuk mempelajari fenomena dan interaksi antara tetesan air (droplet) dan permukaan logam panas dengan metode eksperimental. Pada penelitian ini, droplet dijatuhkan dari posisi 50 mm dari atas permukaan logam dengan frekuensi 8,5 droplet per detik. Diameter droplet yang diamati sebesar 3,12 mm. Logam yang digunakan adalah tembaga dengan temperatur permukaan di antara 110-240° C. High speed video camera dengan kecepatan 2000 fps digunakan untuk merekam data visual. Teknik image processing diaplikasikan untuk menghitung perubahan diameter droplet. Hasil penelitian menunjukkan bahwa pertama, pada temperatur rendah, droplet cenderung mempertahankan posisi awal kontak dengan perubahan bentuk yang fluktuatif. Kedua, temperatur tinggi, terjadi fenomena bouncing yang mengakibatkan tumbukan antar droplet menjadi tidak sempurna. Hasil visualisasi dapat mengungkap perubahan geometri droplet berupa spreading ratio dan apex height secara lengkap. Dari penelitian ini juga diketahui bahwa temperatur 140°C menjadi daerah transisi awal terjadinya fenomena yang mengakibatkan droplet tidak bersinggungan dengan permukaan panas sehingga proses perpindahan kalor antar permukaan terhambat.

Keywords

successive droplets, copper, spreading ratio, apex height

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References

Bernardin, J. D., Stebbins, C. J., & Mudawar, I. (1997). Mapping of impact and heat transfer regimes of water drops impinging on a polished surface. International Journal of Heat and Mass Transfer, 40(2), 247-267. Diunduh dari https://doi.org/10.1016/0017-9310(96)00119-6.

Bertola, V. (2015). An impact regime map for water drops impacting on heated surfaces. International Journal of Heat and Mass Transfer, 85, 430-437. Diunduh dari https://doi.org/10.1016/j.ijheatmasstransfer.2015.01.084.

Biance, A. L., Chevy, F., Clanet, C., Lagu-beau, G., & Quéré, D. (2006). On the elasticity of an inertial liquid shock. Journal of Fluid Mechanics, 554, 47-66. Diunduh dari https://doi.org/10.1017/S0022112006009189.

Deendarlianto, Takata, Y., Hidaka, S., Indarto, Widyaparaga, A., Kamal, S., … Kohno, M. (2014). Effect of static contact angle on the droplet dynamics during the evaporation of a water droplet on the hot walls. International Journal of Heat and Mass Transfer, 71, 691-705. Diunduh dari https://doi.org/10.1016/j.ijheatmasstransfer.2013.12.066.

Deendarlianto, Takata, Y., Widyatama, A., Majid, A. I., Wiranata, A., Wi-dyaparaga, A., …, & Indarto (2018). The interfacial dynamics of the micrometric droplet diameters during the impacting onto inclined hot sur-faces. International Journal of Heat and Mass Transfer, 126, 39-51. Diunduh dari https://doi.org/10.1016/j.ijheatmasstransfer.2018.05.023.

Fujimoto, H., Yoshimoto, S., Takahashi, K., Hama, T., & Takuda, H. (2017). Deformation behavior of two droplets successively impinging obliquely on hot solid surface. Experimental Thermal and Fluid Science, 81, 136-146. Diunduh dari https://doi.org/10.1016/j.expthermflusci.2016.10.009.

Gradeck, M., Seiler, N., Ruyer, P., & Maillet, D. (2013). Heat transfer for Leidenfrost drops bouncing onto a hot surface. Experimental Thermal and Fluid Science, 47, 14-25. Diunduh dari https://doi.org/10.1016/j.expthermflusci.2012.10.023.

Liang, G., Mu, X., Guo, Y., Shen, S., Quan, S., & Zhang, J. (2016). Contact vaporization of an impacting drop on heated surfaces. Experimental Thermal and Fluid Science, 74, 73-80. Diunduh dari https://doi.org/10.1016/j.expthermflusci.2015.11.027.

Liang, G., & Mudawar, I. (2017). Review of drop impact on heated walls. International Journal of Heat and Mass Transfer, 106, 103-126. Di-unduh dari https://doi.org/10.1016/j.ijheatmasstransfer.2016.10.031.

Mitrakusuma, W. H., Kamal, S., Indarto, Dyan Susila, M., Hermawan, & Deendarlianto. (2017). The dynamics of the water droplet impacting onto hot solid surfaces at medium Weber numbers. Heat and Mass Transfer/Waerme-Und Stoffuebertragung, 53(10), 3085-3097. Diunduh dari https://doi.org/10.1007/s00231-017-2053-0.

Park, J. Y., Gardner, A., King, W. P., & Cahill, D. G. (2014). Droplet impingement and vapor layer formation on hot hydrophobic surfaces. Journal of Heat Transfer, 136(9), 1-8. Diunduh dari https://doi.org/10.1115/1.4027856.

Riswanda, A., Pranoto, I., Deendarlianto, Indarto, & Wibowo, T. 2018. Study on the effect of Weber Number to heat transfer of multiple droplets on hot stainless steel surface. Dalam S. Ma’mun, H. Tamura, & M.R.A. Purnomo (Eds.), MATEC Web of Conferences, 154, 01114. Les Ulis Perancis: EDP Sciences. Diunduh dari https://doi.org/10.1051/matecconf/201815401114.

Tran, T., Staat, H. J. J., Susarrey-Arce, A., Foertsch, T. C., Van Houselt, A., Gardeniers, H. J. G. E., … Sun, C. (2013). Droplet impact on superheated micro-structured surfaces. Soft Matter, 9(12), 3272–3282. Diunduh dari https://doi.org/10.1039/c3sm27643k.

Wibowo, T., Widyatama, A., Kamal, S., Indarto, & Deendarlianto. (2018). The effect of pressure and frequency on the dynamic behavior and evaporation time of successive water droplets impacting onto hot surface. MATEC Web of Conferences, 154, 01107. Diunduh dari https://doi.org/10.1051/matecconf/201815401107.

DOI: https://doi.org/10.21831/jps.v24i2.26923