Sains Malaysiana 47(7)(2018): 1599–1605

http://dx.doi.org/10.17576/jsm-2018-4707-31

 

Flow and Heat Transfer in a Nanofluid Thin Film over an Unsteady Stretching Sheet

(Aliran dan Pemindahan Haba dalam Filem Nipis Nanobendalir atas Kepingan Meregang Secara tak Mantap)

 

R.C. AZIZ1, I. HASHIM2* & S. ABBASBANDY3

 

1Faculty of Science & Technology Open University Malaysia, 50480 Kuala Lumpur, Federal Territory, Malaysia

 

2School of Mathematical Sciences, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor Darul Ehsan, Malaysia

 

3Department of Mathematics, Imam Khomeini International University, Ghazvin 34149-16818, Iran

 

Diserahkan: 11 September 2017/Diterima: 27 Februari 2018

 

 

ABSTRACT

This study analyzes the heat transfer of a thin film flow on an unsteady stretching sheet in nanofluids. Three different types of nanoparticles are considered; copper Cu, alumina Al2O3 and titania TiO2 with water as the base fluid. The governing equations are simplified using similarity transformations. The resulting coupled nonlinear differential equations are solved by the Homotopy Analysis Method (HAM). The analytical series solutions are presented and the numerical results obtained are tabulated. In particular, it shows that the heat transfer rate decreases when nanoparticles volume fraction increases.

 

Keywords: Heat transfer; nanofluids; thin film flow

 

ABSTRAK

Kajian ini menganalisis pemindahan haba bagi aliran filem nipis di atas kepingan meregang secara tak mantap dalam nanobendalir. Tiga jenis nanozarah berbeza telah dipertimbangkan; tembaga Cu, alumina Al2O3 dan titania TiO2 dengan air sebagai bendalir asas. Persamaan menakluk dipermudahkan dengan menggunakan persamaan penukaran. Persamaan pembeza tidak linear berangkai yang terhasil diselesaikan melalui Kaedah Analisis Homotopi (KAH). Siri penyelesaian analitik ditunjukkan dan keputusan berangka yang diperoleh dijadualkan. Secara khususnya ditunjukkan bahawa kadar pemindahan haba menurun apabila isi padu pecahan nanozarah meningkat.

 

Kata kunci: Aliran filem nipis; nanobendalir; permindahan haba

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*Pengarang untuk surat-menyurat; email: ishak_h@ukm.edu.my

 

 

 

 

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