Studi Eksperimental Pengaruh Convective Heat Transfer terhadap Pressure Drop pada Aliran Dua Fase Gas-Cair Fluida Newtonian dan non-Newtonian dalam Square Microchannel

https://doi.org/10.22146/jmdt.73376

Luqman Al Huda(1*), Haslinda Kusumaningsih(2), Deendarlianto Deendarlianto(3), Indarto Indarto(4)

(1) Departemen Teknik Mesin dan Industri, Fakultas Teknik, Universitas Gadjah Mada
(2) Departemen Teknik Mesin, Fakultas Teknik, Universitas Brawijaya, Malang, Indonesia
(3) Departemen Teknik Mesin dan Industri, Fakultas Teknik, Universitas Gadjah Mada
(4) Departemen Teknik Mesin dan Industri, Fakultas Teknik, Universitas Gadjah Mada
(*) Corresponding Author

Abstract


Penelitian terkait dua fase gas-cair dalam saluran mikro telah banyak dilakukan. Namun, keterlibatan fluida non-newtonian serta kalor dalam aliran dua fase suatu saluran mikro masih terbatas, terutama pemecahan masalah pada pendinginan perangkat mikro. Permintaan terhadap efisiensi aliran fluida dua fase dalam mengikat kalor menjadi parameter penting dalam keberhasilan sistem pendinginan. Tujuan penelitian ini membandingkan beda tekanan antara fluida newtonian dan non-newtonian berdasarkan perbedaan viskositas pada aliran dua fase. Penelitian juga menambahkan perlakuan kalor konveksi dan mengamati pada dua area, yaitu sebelum (upstream) dan sesudah (downstream) terdampak kalor. Jenis fluida cair newtonian yang digunakan yaitu aquadest dan fluida non-newtonian yaitu Carboxymethil Cellulose (CMC wt 0,4%), sedangkan fluida gas yang digunakan adalah nitrogen. Dimensi diameter hidrolis saluran sebesar 0,8 mm. Kecepatan superfisial cairan divariasikan mulai 0,1 m/s hingga 1 m/s, sedangkan kecepatan superfisial gas divariasikan mulai 0,26 m/s hingga 7,81 m/s. High speed video camera digunakan untuk merekam pola aliran, panjang dan kecepatan gelembung terbentuk. Hasil penelitian aliran nitrogen-aquadest membentuk pola aliran bubbly, slug, churn dan slug-annular, sedangkan nitrogen-CMC wt 0,4% membentuk slug, churn dan slug-annular. Perbedaan viskositas aquadest memberikan beda tekanan lebih rendah daripada CMC wt 0,4%. Penambahan kalor mampu memberikan beda tekanan yang lebih rendah diiringi dengan penurunan viskositas cairan.


Keywords


Two phase flow; Microchannel; Non-Newtonian; Convective Heat Transfer

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DOI: https://doi.org/10.22146/jmdt.73376

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