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Research Papers: Forced Convection

Unsteady Convection Flow of Some Nanofluids Past a Moving Vertical Flat Plate With Heat Transfer

[+] Author and Article Information
M. Turkyilmazoglu

Department of Mathematics,
Hacettepe University,
Ankara 06532-Beytepe, Turkey
e-mail: turkyilm@hotmail.com

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received June 2, 2012; final manuscript received October 5, 2013; published online December 23, 2013. Assoc. Editor: Giulio Lorenzini.

J. Heat Transfer 136(3), 031704 (Dec 23, 2013) (7 pages) Paper No: HT-12-1265; doi: 10.1115/1.4025730 History: Received June 02, 2012; Revised October 05, 2013

This paper is devoted to the study of heat and mass transfer characteristics of some nanofluid flows past an infinite flat plate moving vertically. Some water-based nanofluids containing copper (Cu), silver (Ag), copper oxide (CuO), alumina (Al2O3), and titanium oxide (TiO2) are analytically analyzed taking into consideration the thermal radiation effect for two types of temperature boundary conditions. The physically significant properties like skin friction coefficient and Nusselt number are easy to conceive from the derived exact analytical expressions for the velocity and temperature profiles. Results are believed to constitute a tool to verify the validity of numerical solutions for more complicated transient free/forced convection nanofluid flow problems.

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Figures

Grahic Jump Location
Fig. 1

Flow configuration

Grahic Jump Location
Fig. 2

Values of the scaled Nusselt number (Nu*) against the nanoparticle volume fraction (φ) for five different water-based nanofluids; dotted curve (.) for TiO2, dotted-dashed curve (–.–) for Al2O3, dashed curve (– –) for CuO, thin curve (— -) for Cu and thick curve for Ag. (a) Nr = 0 and (b) Nr = 1. For the non moving plate d = 0.

Grahic Jump Location
Fig. 3

Values of the scaled skin friction (Cf*) against the nanoparticle volume fraction (φ) in the case of PST for five different water-based nanofluids; dotted curve (.) for TiO2, dotted-dashed curve (–.–) for Al2O3, dashed curve (– –) for CuO, thin curve (— -) for Cu and thick curve for Ag. (a) Nr = 0 and (b) Nr = 1. For the non moving plate d = 0.

Grahic Jump Location
Fig. 4

Values of the scaled skin friction (Cf*) against the nanoparticle volume fraction (φ) in the case of PST for five different water-based nanofluids; dotted curve (.) for TiO2, dotted-dashed curve (–.–) for Al2O3, dashed curve (– –) for CuO, thin curve (— -) for Cu and thick curve for Ag. (a),(c) Nr = 0 and (b),(d) Nr = 1. (a), (b) is for d = 1 and (c), (d) is for d = −1.

Grahic Jump Location
Fig. 5

Values of the scaled skin friction (Cf*) against the nanoparticle volume fraction (φ) in the case of PHF for five different water-based nanofluids; dotted curve (.) for TiO2, dotted-dashed curve (–.–) for Al2O3, dashed curve (– –) for CuO, thin curve (— -) for Cu and thick curve for Ag. (a) Nr = 0 and (b) Nr = 1. For the non moving plate d = 0.

Grahic Jump Location
Fig. 6

Values of the scaled skin friction (Cf*) against the nanoparticle volume fraction (φ) in the case of PHF for five different water-based nanofluids; dotted curve (.) for TiO2, dotted-dashed curve (–.–) for Al2O3, dashed curve (– –) for CuO, thin curve (— -) for Cu and thick curve for Ag. (a),(c) Nr = 0 and (b),(d) Nr = 1. (a),(b) is for d = 1 and (c),(d) is for d = −1.

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