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An investigation into modelling thermal conductivity for alumina–water nanofluids

An investigation into modelling thermal conductivity for alumina–water nanofluids. S.S. Mallick , A. Mishra, L. Kundan. Tujuan. Investigasi model-model konduktivitas panas untuk Nanofluida Al 2 O 3 -air seperti: Yu & Choi Koo & Kleinstreuer Xie et al Murshed et al Nan et al Chon et al

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An investigation into modelling thermal conductivity for alumina–water nanofluids

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  1. An investigation into modelling thermal conductivity for alumina–water nanofluids S.S. Mallick , A. Mishra, L. Kundan PPT by Heliokinesis Group

  2. Tujuan • Investigasi model-model konduktivitas panas untuk Nanofluida Al2O3-air seperti: • Yu & Choi • Koo & Kleinstreuer • Xie et al • Murshed et al • Nan et al • Chon et al • Minsta et al • Teng et al • Pengembangan Model baru dengan menggunakan: • Prandtl (efek mikrokonveksion), • Reynolds (turbulensi), • Brinkman (rasio transfer panas difusi dan konduksi) Studi Teoretik Studi Empiris PPT by Heliokinesis Group

  3. Evaluasi Model • Parameter-parameter: • Konduktivitas panas Al2O3: • 41.44 W/mK (0OC) – 31.03 W/mK (100OC) • Konduktivitas panas air: • 0.57 W/mK (0OC) – 0.67 W/mK (100OC) • Kapasitas panas spesifik air: • 4.186 kJ/kg.K, • Densitas Air: • 1000 kg/m3 • Diameter molekul air: • 0.3 nm • Densitas Al2O3: • 3965 kg/m3. • Kapasitas panas spesifik Al2O3: • 880 J/kg.K PPT by Heliokinesis Group

  4. Evaluasi Model PPT by Heliokinesis Group

  5. Evaluasi Model PPT by Heliokinesis Group

  6. Evaluasi Model PPT by Heliokinesis Group

  7. Evaluasi Model PPT by Heliokinesis Group

  8. Evaluasi Model PPT by Heliokinesis Group

  9. Evaluasi Model PPT by Heliokinesis Group

  10. Evaluasi Model • Efek Cluster PPT by Heliokinesis Group

  11. Pengembangan Model PPT by Heliokinesis Group

  12. Pengembangan Model • Menggunakan analisis non-dimensi • dengan: Bil. Prandtl Teorema Pi Bucking ham PPT by Heliokinesis Group

  13. Pengembangan Model • Untuk PI6 dan PI7 • dengan PPT by Heliokinesis Group

  14. Pengembangan Model • Sehingga, model konduktivitas panas nanofluida menjadi: • Dengan menggunakan data eksperimen untuk Nanofluida Al2O3-air PPT by Heliokinesis Group

  15. Evaluasi Model PPT by Heliokinesis Group

  16. Evaluasi Model PPT by Heliokinesis Group

  17. Jika terjadi clustering, maka sifat nanopartikel (p) harus digantikan dengan sifat cluster (c) Dikembangkan oleh Yuan et al PPT by Heliokinesis Group

  18. Evaluasi Model PPT by Heliokinesis Group

  19. Kesimpulan • Evaluasi 8 model dengan membandingkan hasil prediksi dengan hasil eksperimen memiliki kesalahan relatif berkisar antara 2.34– 58% • Evaluasi pengembangan model dengan membandingkan hasil prediksi dengan hasil eksperimen memiliki kesalahan relatif sekitar 5% secara keseluruhan PPT by Heliokinesis Group

  20. Referensi • S.S. Mallick , A. Mishra, L. Kundan. An investigation into modelling thermal conductivity for alumina–water nanofluids. Powder Technology 233 (2013) 234–244 PPT by Heliokinesis Group

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