Al2O3–water nanofluid inside wavy mini-channel with different cross-sectionsby M. Khoshvaght-Aliabadi, S.E. Hosseini Rad, F. Hormozi

Journal of the Taiwan Institute of Chemical Engineers


Chemistry (all) / Chemical Engineering (all)



JID: JTICE [m5G;June 6, 2015;20:19]

Journal of the Taiwan Institute of Chemical Engineers 000 (2015) 1–11

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T r w t g h 1l2O3–water nanofluid inside wavy miniross-sections . Khoshvaght-Aliabadia,∗, S.E. Hosseini Radb, F. Hor

Department of Chemical Engineering, Shahrood Branch, Islamic Azad University, 36199-43

Faculty of Chemical, Petroleum, and Gas Engineering, Semnan University, Semnan, Iran r t i c l e i n f o rticle history: eceived 28 January 2015 evised 12 May 2015 ccepted 17 May 2015 vailable online xxx eywords: avy mini-channels ross-section a b s t r a c t

Laminar convection of wate wavy mini-channel (WMC) is simulated by using the m nanofluid behavior. The res compared to the SMC. It is enhancement inside the SM rates are obtained for theW all the cases, the nanofluid anofluid aminar flow umerical approach to the water flow. Finally, correl the range of the studied Reynold © 2015 Taiwan In . Introduction

Heat transfer and fluid flow in channels or ducts are the tradiional issues in many engineering applications such as heat exchangrs, chemical reactors, electronic systems, solar collectors, or power lants. Replacing complicated channels like the wavy channels intead of the straight ones is a promising method to enhance the hermal performance and provide higher compactness in these intruments [1]. Also in the recent years, different metallic and oxideetallic nanofluids are introduced and applied by many researchers. owever, most of the studies are for the nanofluid flow inside the traight channels with the circular cross-section, and there are very imited studies on the nanofluid flow inside the indirect channels [2].

Heat transfer and flow field characteristics of the Cu–water anofluid in a wavy channel were studied by Heidary and Kermani 3]. The results show that this compound technique, i.e. nanofluid ow inside the wavy channel, enhances the heat transfer up to 50%. hermal-hydraulic performance of the Cu–water nanofluid in the corugated channels with triangular, sinusoidal, and trapezoidal waves as investigated by Ahmed et al. [4–6]. The effects of nanoparicle shapes on the forced convection flow of the SiO2–ethylene lycol nanofluids inside the wavy channels were investigated by ∗ Corresponding author. Tel.: +989151811311; fax: +985812244818.

E-mail, (M. Khoshvaght-Aliabadi).

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R i c n s o fl t t b t ttp:// 876-1070/© 2015 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All righ

Please cite this article as: M. Khoshvaght-Aliabadi et al., Al2O3–water n

Journal of the Taiwan Institute of Chemical Engineers (2015), http://dx.dote of Chemical Engineers nnel with different ib hahrood, Iran 1% vol. Al2O3–water nanofluid through the straight mini-channel (SMC) and various cross-section geometries is studied numerically. The nanofluid flow re model, which has been verified to be the appropriate model to simulate epict higher values of the heat transfer rate and pumping power for theWMC found that the hexagonal cross-section causes a considerable heat transfer comparison with the other cross-sections. However, the highest heat transfer ith the rhombic and triangular cross-sections. It is necessary to note that for resents higher values of the heat transfer rate and pumping power comparedations are developed for the SMC and WMC with different cross-sections in s number, i.e. 300–1500. stitute of Chemical Engineers. Published by Elsevier B.V. All rights reserved. anaki et al. [7]. The nanofluid with the platelets nanoparticle shape ives the highest heat transfer enhancement. Recently, Khoshvaght– liabadi [8] analyzed heat transfer and flow characteristics of the inusoidal-corrugated channel with Al2O3–water nanofluid. The efects of different geometrical parameters were evaluated at the anoparticle volume fraction below 4%. The channel height and wave mplitude show the highest influences on Nusselt number and fricion factor values. Heat transfer performance of the Al2O3–water anofluid in a wavy mini-channel under pulsating inlet flow conitions was examined by Akdag et al. [9]. Results show that using he nanoparticles under pulsating flow promotes the thermal perforance. The effect of the Al2O3–water nanofluid flow on performance f the sinusoidal-wavy channel with different wall phase shifts was nvestigated by Ahmed et al. [10]. Results indicate that the optimal erformance is achieved by 0° phase shift channel over the ranges of eynolds number and nanoparticle volume fraction. Also, they studed the effect of the corrugation profile and depicted the trapezoidal hannel has the highest Nusselt number [11].

All the mentioned studies were conducted numerically for 2-D anofluid flow, and experimental studies on the nanofluid flow inide the wavy or corrugated channels are very scarce. Application f the nanofluid (Al2O3 in water 2, 3 and 4 vol.%) inside a counter ow corrugated plate heat exchanger was investigated experimenally by Pandey and Nema [12]. The results indicate that the heat ransfer performance improves with increasing both Reynolds numer and Peclet number, while it declines with the concentration of he nanofluid. An experimental study on the forced convective flow ts reserved. anofluid inside wavy mini-channel with different cross-sections, 2 M. Khoshvaght-Aliabadi et al. / Journal of the Taiwan Institute of Chemical Engineers 000 (2015) 1–11


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The governing equations of the fluid flow and heat transfer are 3D continuity, Navier–Stokes, and energy equations with the following basic assumptions: (1) Newtonian and incompressible working fluids (water and