Sains Malaysiana 47(7)(2018): 1617–1623

http://dx.doi.org/10.17576/jsm-2018-4707-33

Mixed Convection Flow of Viscoelastic Nanofluid Past a Horizontal Circular Cylinder with Viscous Dissipation

(Aliran Olakan Campuran Bendalir Nano Likat melalui Silinder Bulat Mengufuk dengan Pelepasan Likat)

RAHIMAH MAHAT^1,2, NORAIHAN AFIQAH RAWI², ABDUL RAHMAN MOHD KASIM³

 & SHARIDAN SHAFIE²*

¹Universiti Kuala Lumpur Malaysian, Institute of Industrial Technology, Persiaran Sinaran Ilmu, 81750 Johor Bahru, Johor Darul Takzim, Malaysia

²Universiti Teknologi Malaysia, 81310 Johor Bahru, Johor Darul Takzim, Malaysia

³Universiti Malaysia Pahang, Lebuhraya Tun Razak, 26300 Gambang, Kuantan, Pahang Darul Makmur, Malaysia

Received: 26 September 2017/ Accepted: 19 February 2018

ABSTRACT

The purpose of this study was to examine the effect of viscous dissipation on mixed convection flow of viscoelastic nanofluid past a horizontal circular cylinder. Carboxymethyl cellulose solution (CMC) is chosen as the base fluid and copper as a nanoparticle with the Prandtl number Pr = 6.2. The transformed boundary layer equations for momentum and temperature subject to the appropriate boundary conditions are solved numerically by using Keller-box method. The influenced of the dimensionless parameters such as Eckert number, mixed convection parameter, nanoparticles volume fraction and viscoelastic parameter on the flow and heat transfer characteristics is analyzed in detail and presented graphically. The results come out with the velocity profiles are increased while the temperature profiles are decreased by increasing the values of nanoparticles volume fraction and viscoelastic parameter, respectively. The graph shows that, increasing Eckert number the skin friction is also increases. The values of skin friction are increased by increasing mixed convection parameter, but the values of Nusselt number produce an opposite behavior. The present study has many applications especially in heat exchangers technology and oceanography. Therefore, in future, it is hoping to study the viscoelastic nanofluid flow past a different geometric such as sphere and cylindrical cone.

Keywords: Horizontal circular cylinder; nanofluid; viscoelastic; viscous dissipation

ABSTRAK

Tujuan kajian ini adalah untuk mengkaji kesan pelesapan likat pada aliran olakan campuran bendalir-nano likat kenyal melepasi sebuah silinder membulat yang mengufuk. Larutan selulosa karboksimetil (CMC) dipilih sebagai bendalir dasar dan tembaga sebagai nano zarah dengan nombor Prandtl Pr = 6.2. Persamaan lapisan sempadan yang diubah untuk momentum dan suhu tertakluk kepada syarat sempadan yang bersesuaian diselesaikan secara berangka dengan menggunakan Kotak-Keller. Kesan pemboleh ubah tanpa matra seperti nombor Eckert, parameter olakan campuran, pecahan isi padu nano zarah dan parameter likat kenyal ke atas aliran dan sifat pemindahan haba dianalisis secara terperinci dan dibincangkan secara grafik. Keputusan menunjukkan bahawa profil halaju meningkat manakala profil suhu menurun masing-masing dengan peningkatan nilai pecahan isi padu nano zarah dan parameter likat kenyal. Graf menunjukkan bahawa dengan peningkatan nombor Eckert, geseran kulit juga meningkat. Nilai geseran kulit meningkat dengan peningkatan parameter olakan campuran, tetapi nilai nombor Nusselt menghasilkan tingkah laku yang bertentangan. Kajian semasa ini mempunyai banyak aplikasi terutamanya dalam teknologi penukaran haba dan oseanografi. Oleh itu, pada masa akan datang, diharapkan dapat mengkaji aliran bendalir-nano likat kenyal melepasi geometri yang berbeza seperti sfera dan kon bersilinder.

Kata kunci: Bendalir-nano; likat kenyal; pelesapan likat; silinder bulat mengufuk

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*Corresponding author; email: sharidan@utm.my